阅读说明：本技术 一种可实现导热误差校正的光纤光栅总温测量装置 (Fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction ) 是由 刘显明 韩国庆 章鹏 雷小华 任怡霖 昌小小 于 2021-08-13 设计创作，主要内容包括：本发明公开一种可实现导热误差校正的光纤光栅总温测量装置,包括安装基座(1)、支架(2)、总温探针(6)和支架温度探针(7)；本发明提供了一种可实现导热误差校正的光纤光栅总温测量装置,该装置能够校正导热误差,改善测温精度,提高测量数据准确性,装置总体尺寸小、结构灵活,可以同时校正多支总温探针的导热误差。(The invention discloses a fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction, which comprises a mounting base (1), a bracket (2), a total temperature probe (6) and a bracket temperature probe (7); the invention provides a fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction, which can correct heat conduction errors, improve temperature measurement precision, improve accuracy of measured data, has small overall size and flexible structure, and can correct heat conduction errors of a plurality of total temperature probes at the same time.)

1. The utility model provides a can realize total temperature measuring device of fiber grating of heat conduction error correction which characterized in that: the temperature control device comprises a mounting base (1), a support (2), a total temperature probe (6) and a support temperature probe (7).

The mounting base (1) is used for supporting the bracket (2);

a plurality of total temperature probe mounting holes (3) are formed in the side, facing the airflow, of the support (2);

the bracket (2) is a hollow cylinder;

a bracket temperature probe mounting hole (5) is formed in the bottom end of the bracket (2);

the total temperature probe (6) is fixed on the bracket (2) through the total temperature probe mounting hole (3);

the total temperature probe (6) is used for monitoring the total temperature of the airflow;

the support temperature probe (7) is fixed in the support (2) through a support temperature probe mounting hole (5);

the support temperature probe (7) is used for monitoring the temperature of the support (2).

2. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 1, wherein: a plurality of total temperature probe grating supporting tube leading-out holes (4) are formed in the back airflow side of the support (2).

3. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 2, wherein: the total temperature probe (6) comprises a stagnation cover (601), an air inlet hole (602), an air outlet hole (603), a total temperature probe grating support tube (604), a total temperature fiber grating (605) and a transmission fiber (606);

the stagnation cover (601) is bonded with the total temperature probe mounting hole (3);

an air inlet (602) facing to the incoming flow direction and an air outlet (603) perpendicular to the air flow direction are formed in the stagnation cover (601);

one end of the total temperature probe grating support tube (604) is adhered with the stagnation cover (601), and the other end is led out through a total temperature probe grating support tube leading-out hole (4);

the end of the fiber bragg grating (605) is coaxially arranged in the stagnation cover (601), and the tail of the fiber bragg grating is connected with the transmission fiber (606);

the fiber bragg grating (605) is positioned between the air inlet hole (602) and the air outlet hole (603),

the tail part of the transmission optical fiber (606) is bonded with the total temperature probe grating support tube (604).

4. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 3, wherein: the number of the exhaust holes is even. The exhaust holes are symmetrically distributed.

5. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 3, wherein: the sum of the cross sectional areas of the exhaust holes is 30 percent of the cross sectional area of the air inlet hole_～40％。

6. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 3, wherein: the total temperature probe (6) also comprises a high temperature glue (607);

the high-temperature glue (607) is used for realizing the adhesion of the stagnation cover (601) and the total temperature probe mounting hole (3) and the adhesion of the transmission optical fiber (606) and the total temperature probe grating support tube (604).

7. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 1, wherein: the bracket temperature probe (7) comprises a bracket temperature probe supporting tube (701), a plurality of bracket temperature measuring fiber gratings (702) and a plurality of transmission fibers (703);

the support temperature probe support tube (701) is bonded with the support temperature probe mounting hole (5);

the bracket temperature measurement fiber bragg gratings (702) are arranged in the transmission fiber (703) at intervals;

the tail part of the transmission optical fiber (703) is bonded with the support tube (701) of the bracket temperature probe.

8. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 7, wherein: the bracket temperature probe (7) also comprises high-temperature glue (704);

the high-temperature glue (704) is used for realizing the adhesion of the support temperature probe support tube (701) and the support temperature probe mounting hole (5), and the adhesion of the transmission optical fiber (703) and the support temperature probe support tube (701).

9. The device for measuring the total temperature of the fiber bragg grating capable of realizing the thermal conduction error correction according to claim 8, wherein: the tail end of the support pipe (701) of the bracket temperature probe is sealed by high-temperature glue (704).

Technical Field

The invention relates to the technical field of total temperature testing of airflow, in particular to a fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction.

Background

In the field of aerospace, the total temperature of high-speed airflow is an important test parameter and is mainly used for evaluating equipment performance, monitoring states and the like. The accurate measurement of the high-speed airflow temperature can provide necessary data support for the design, production, test, use and the like of the aircraft engine, and plays an important role in the verification of technical indexes and the reliability evaluation of the aircraft engine.

The total temperature of the high-speed airflow refers to the temperature which can be reached by the airflow in an adiabatic stagnation state, and in the actual measurement process, multiple measurement errors including heat conduction errors, speed errors, radiation errors and dynamic response errors often exist.

At present, the mature thermocouple technology is widely used for total temperature measurement in the field of aerospace, but the thermocouple has the problems of sensitivity to electromagnetic interference, incapability of multiplexing or distributed sensing, poor stability and repeatability and the like. Fiber gratings are increasingly being used for high-speed airflow temperature measurement due to their advantages of small size, electromagnetic interference resistance, high sensitivity, no need for insulation processing, multiplexing, etc.

In the total temperature measuring process of the conventional fiber grating total temperature measuring device, because a temperature sensing point and a support have larger temperature deviation, a measuring result often contains larger heat conduction error, so that a fiber grating total temperature probe cannot accurately measure the total temperature of airflow, and the temperature measuring precision is reduced. However, the existing heat conduction error calculation model generally models the total temperature probe as a straight fin, which is affected by the convection heat transfer along the surface of the sensor.

Disclosure of Invention

The invention aims to provide a fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction.

The mounting base is used for supporting the bracket.

And a plurality of total temperature probe mounting holes are formed in the side, facing the airflow, of the support.

The support is a hollow cylinder.

And a support temperature probe mounting hole is formed in the bottom end of the support.

And a plurality of total temperature probe grating supporting tube leading-out holes are formed in the back airflow side of the support.

And the total temperature probe is fixed on the bracket through the total temperature probe mounting hole.

The total temperature probe is used for monitoring the total temperature of the high-speed airflow.

The total temperature probe comprises a stagnation cover, an air inlet, an air outlet, a total temperature probe grating support tube, a total temperature fiber grating and a transmission fiber.

And the stagnation cover is bonded with the total temperature probe mounting hole.

The stagnation cover is provided with an air inlet facing to the incoming flow direction and an air outlet perpendicular to the air flow direction.

The number of the exhaust holes is even. The exhaust holes are symmetrically distributed.

The sum of the cross sectional areas of the exhaust holes is 30-40% of the cross sectional area of the air inlet hole.

One end of the total temperature probe grating supporting tube is adhered to the stagnation cover, and the other end of the total temperature probe grating supporting tube is led out through the total temperature probe grating supporting tube leading-out hole.

The end of the fiber grating is coaxially arranged in the stagnation cover, and the tail of the fiber grating is connected with the transmission fiber.

The fiber grating is positioned between the air inlet hole and the air outlet hole,

the tail part of the transmission optical fiber is bonded with the total temperature probe grating support tube.

The total temperature probe also comprises high temperature glue.

The high-temperature glue is used for realizing the adhesion of the stagnation cover and the total temperature probe mounting hole and the adhesion of the transmission optical fiber and the total temperature probe grating supporting tube.

And the support temperature probe is fixed in the support through a support temperature probe mounting hole.

The stent temperature probe is used for monitoring the temperature of the stent.

The support temperature probe comprises a support temperature probe support tube, a plurality of support temperature measurement fiber gratings and a plurality of transmission fibers.

And the support temperature probe support tube is bonded with the support temperature probe mounting hole.

The bracket temperature measurement fiber bragg gratings are arranged in the transmission fiber at intervals.

The tail part of the transmission optical fiber is bonded with the support tube of the support temperature probe.

The support temperature probe also comprises high-temperature glue.

The high-temperature glue is used for realizing the bonding of the support temperature probe support tube and the support temperature probe mounting hole and the bonding of the transmission optical fiber and the support temperature probe support tube.

The tail end of the support tube of the support temperature probe is sealed by high-temperature glue.

The quantity and the spacing of the bracket temperature measurement fiber bragg gratings are determined by the installation position and the quantity of the total temperature probes. The bracket temperature measurement fiber bragg gratings correspond to the total temperature probes one by one.

The technical effects of the invention are undoubted, and the beneficial effects of the invention are as follows:

1) the invention provides a fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction, which can correct heat conduction errors, improve temperature measurement precision, improve accuracy of measured data, has small overall size and flexible structure, and can correct heat conduction errors of a plurality of total temperature probes at the same time.

2) According to the invention, the support temperature probes are placed in the support mounting holes, so that the support temperatures corresponding to different total temperature probes are obtained, and the heat conduction error of the total temperature probe measuring device is directly calculated.

3) The invention adopts two temperature sensing gratings to directly measure the total temperature of the airflow and the temperature of the bracket, can obtain real-time heat conduction errors and further correct the measured temperature of the total temperature in real time.

4) The invention can realize the correction of the heat conduction error of the multipoint total temperature measuring rake at the same time thanks to the multiplexing capability of the fiber bragg grating.

5) The invention can write the corresponding fiber bragg grating used by the bracket probe according to the installation position and the number of the total temperature probes of the specific total temperature measuring device, has high flexibility and is convenient to adjust.

6) All the fiber gratings disclosed by the invention adopt short-distance gratings, so that the temperature measurement influence of a non-uniform temperature field on the gratings can be effectively reduced, and the temperature measurement error is reduced.

7) The invention adopts the fiber bragg grating as the temperature sensing element, and the total temperature probe has small size and is anti-electromagnetic interference.

8) The metal structural parts disclosed by the invention are bonded by high-temperature glue, so that the sealing property and integrity are ensured.

9) The fiber grating disclosed by the invention uses the support tube to protect the fiber grating, so that the reliability of the probe is greatly improved.

Drawings

FIG. 1 is a schematic view of a total temperature measurement device for fiber bragg gratings

FIG. 2 is a schematic view of the structure of a total temperature probe

FIG. 3 is a schematic view of a temperature probe for a stent

FIG. 4 is a schematic diagram of the spectral response characteristics of a fiber Bragg grating

FIG. 5 is a schematic diagram of a fiber grating total temperature measurement device applied to the temperature measurement of an internal flow passage of an aircraft engine;

in the figure: the temperature measurement device comprises a mounting base 1, a support 2, a total temperature probe mounting hole 3, a total temperature probe grating support tube leading-out hole 4, a support temperature probe mounting hole 5, a total temperature probe 6, a support temperature probe 7, a stagnation cover 601, an air inlet hole 602, an air outlet hole 603, a total temperature probe grating support tube 604, a total temperature fiber grating 605, a transmission fiber 606, high-temperature glue 607, a support temperature probe support tube 701, a support temperature measurement fiber grating 702, a transmission fiber 703 and high-temperature glue 704.

Detailed Description

The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.

Example 1:

referring to fig. 1 to 5, a fiber grating total temperature measuring device capable of implementing thermal conductivity error correction includes a mounting base 1, a bracket 2, a total temperature probe 6 and a bracket temperature probe 7.

The mounting base 1 is used to support a bracket 2.

And a plurality of total temperature probe mounting holes 3 are formed in the side, facing the airflow, of the support 2.

The support 2 is a hollow cylinder.

And a support temperature probe mounting hole 5 is formed in the bottom end of the support 2.

And a plurality of total temperature probe grating supporting tube leading-out holes 4 are formed in the back airflow side of the bracket 2.

And the total temperature probe 6 is fixed on the bracket 2 through the total temperature probe mounting hole 3.

The total temperature probe 6 is used for monitoring the total temperature of the high-speed airflow.

The total temperature probe 6 comprises a stagnation cover 601, an air inlet 602, an air outlet 603, a total temperature probe grating support tube 604, a total temperature fiber grating 605 and a transmission fiber 606.

The stagnation cover 601 is bonded to the total temperature probe mounting hole 3.

The stagnation cover 601 is provided with an air inlet 602 facing the incoming flow direction and an air outlet 603 perpendicular to the air flow direction.

The number of the exhaust holes is even. The exhaust holes are symmetrically distributed.

The sum of the cross sectional areas of the exhaust holes is 30-40% of the cross sectional area of the air inlet hole.

One end of the total temperature probe raster support tube 604 is adhered to the stagnation cover 601, and the other end is led out of an engine internal flow passage (shown in fig. 5) to the demodulator through the total temperature probe raster support tube leading-out hole 4.

The end of the fiber grating 605 is coaxially installed in the stagnation cover 601, and the tail is connected with the transmission fiber 606.

The fiber grating 605 is located between the air inlet hole 602 and the air outlet hole 603,

the tail of the transmission optical fiber 606 is bonded with the total temperature probe grating support tube 604.

The total temperature probe 6 further comprises a high temperature glue 607.

The high-temperature glue 607 is used for realizing the adhesion of the stagnation cover 601 and the total temperature probe mounting hole 3 and the adhesion of the transmission optical fiber 606 and the total temperature probe grating support tube 604.

And the support temperature probe 7 is fixed in the support 2 through the support temperature probe mounting hole 5.

The support temperature probe 7 is used to monitor the temperature of the support 2.

The support temperature probe 7 comprises a support temperature probe support tube 701, a plurality of support temperature measurement fiber gratings 702 and a plurality of transmission fibers 703.

The support temperature probe support tube 701 is bonded to the support temperature probe mounting hole 5.

The bracket temperature measurement fiber bragg gratings 702 are arranged at intervals in the transmission fiber 703.

The tail of the transmission optical fiber 703 is bonded with the support tube 701 of the bracket temperature probe.

The stent temperature probe 7 further comprises a high temperature glue 704.

The high-temperature adhesive 704 is used for adhering the support temperature probe support tube 701 to the support temperature probe mounting hole 5, and adhering the transmission optical fiber 703 to the support temperature probe support tube 701.

The tail end of the support tube 701 for the bracket temperature probe is sealed by high temperature glue 704.

The number and the spacing of the bracket temperature-measuring fiber gratings 702 are determined by the installation position and the number of the total temperature probes 6. The bracket temperature measurement fiber bragg gratings 702 correspond to the total temperature probes 6 one by one. The corresponding bracket temperature measurement fiber bragg grating 702 and the total temperature probe 6 are positioned on the same horizontal line.

Example 2:

a fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction comprises a mounting base 1, a support 2, a total temperature probe 6 and a support temperature probe 7.

The mounting base 1 is used to support a bracket 2.

And a plurality of total temperature probe mounting holes 3 are formed in the side, facing the airflow, of the support 2.

The support 2 is a hollow cylinder.

And a support temperature probe mounting hole 5 is formed in the bottom end of the support 2.

And the total temperature probe 6 is fixed on the bracket 2 through the total temperature probe mounting hole 3.

The total temperature probe 6 is used for monitoring the total temperature of the high-speed airflow.

And the support temperature probe 7 is fixed in the support 2 through the support temperature probe mounting hole 5.

The support temperature probe 7 is used to monitor the temperature of the support 2.

Example 3:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in an embodiment 2, wherein a plurality of total temperature probe grating supporting tube leading-out holes 4 are formed in the back airflow side of a support 2.

Example 4:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in embodiment 2, wherein the total temperature probe 6 comprises a stagnation cover 601, an air inlet 602, an air outlet 603, a total temperature probe grating support tube 604, a total temperature fiber bragg grating 605 and a transmission fiber 606.

The stagnation cover 601 is bonded to the total temperature probe mounting hole 3.

The stagnation cover 601 is provided with an air inlet 602 facing the incoming flow direction and an air outlet 603 perpendicular to the air flow direction.

One end of the total temperature probe grating support tube 604 is adhered to the stagnation cover 601, and the other end is led out through the total temperature probe grating support tube leading-out hole 4.

The end of the fiber grating 605 is coaxially installed in the stagnation cover 601, and the tail is connected with the transmission fiber 606.

The fiber grating 605 is located between the air inlet hole 602 and the air outlet hole 603,

the tail of the transmission optical fiber 606 is bonded with the total temperature probe grating support tube 604.

Example 5:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in embodiment 2, wherein the number of the exhaust holes is even. The exhaust holes are symmetrically distributed.

The sum of the cross sectional areas of the exhaust holes is 30-40% of the cross sectional area of the air inlet hole.

Example 6:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in embodiment 2, wherein the total temperature probe 6 further comprises high-temperature glue 607.

The high-temperature glue 607 is used for realizing the adhesion of the stagnation cover 601 and the total temperature probe mounting hole 3 and the adhesion of the transmission optical fiber 606 and the total temperature probe grating support tube 604.

Example 7:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in embodiment 2, wherein the bracket temperature probe 7 comprises a bracket temperature probe supporting tube 701, a plurality of bracket temperature measuring fiber bragg gratings 702 and a plurality of transmission fibers 703.

The support temperature probe support tube 701 is bonded to the support temperature probe mounting hole 5.

The bracket temperature measurement fiber bragg gratings 702 are arranged at intervals in the transmission fiber 703.

The tail of the transmission optical fiber 703 is bonded with the support tube 701 of the bracket temperature probe.

Example 8:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in embodiment 2, wherein the bracket temperature probe 7 further comprises high-temperature glue 704.

The high-temperature adhesive 704 is used for adhering the support temperature probe support tube 701 to the support temperature probe mounting hole 5, and adhering the transmission optical fiber 703 to the support temperature probe support tube 701.

Example 9:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in embodiment 2, wherein the tail end of a support temperature probe support tube 701 is sealed by high-temperature glue 704.

Example 10:

the main structure of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is shown in embodiment 2, wherein the number and the interval of the bracket temperature measuring fiber bragg gratings 702 are determined by the installation position and the number of the total temperature probes 6.

Example 11:

a fiber grating total temperature measuring device capable of realizing heat conduction error correction comprises:

mounting a base;

the device comprises a main body of a total temperature device bracket and a cylindrical structure, wherein one end of the main body of the total temperature device bracket is connected with the mounting base, a plurality of total temperature probe mounting holes are formed in the incoming flow direction of airflow, a grating support tube leading-out hole is formed in the airflow side of the back of the bracket, and a bracket temperature probe mounting hole is formed in the main body of the total temperature device bracket;

the total temperature probes are arranged in the corresponding mounting holes;

the total temperature probe includes:

the stagnation cover is tightly bonded with the mounting hole and is provided with an air inlet facing to the incoming flow direction and air outlet holes perpendicular to the air flow direction, and the number of the air outlet holes is even. The exhaust holes are symmetrically distributed. The sum of the cross sectional areas of the exhaust holes is 30-40% of the cross sectional area of the air inlet hole.

One end of the grating supporting tube is tightly adhered to the stagnation cover, and the other end of the grating supporting tube is led out through the bracket leading-out hole;

the end of the fiber grating is coaxially arranged in the stagnation cover and is positioned between the air inlet hole and the air outlet hole, the tail part of the fiber grating is tightly adhered to the grating supporting tube, the fiber grating is carved on a common commercial optical fiber through an excimer laser, and the fiber grating needs to be cut to enable the grating to be positioned at the end position.

The bracket temperature probes are arranged in the corresponding mounting holes;

the stent temperature probe comprises:

the grating supporting tube is tightly bonded with the mounting hole, and the tail end of the grating supporting tube is bonded and sealed;

and the tail part of the fiber grating is tightly adhered to the grating supporting tube, the fiber grating is formed by engraving on a common commercial optical fiber through an excimer laser, and gratings with corresponding intervals and quantities are engraved according to the installation position and the quantity of the total temperature probes.

Example 12:

the principle of measuring the heat conduction error of the fiber bragg grating total temperature measuring device capable of realizing heat conduction error correction is as follows:

in the process of measuring the total temperature of the gas, the measuring end of the fiber bragg grating sensor needs to exchange heat with the measured gas flow and also needs to transfer heat to the root part and the bracket with lower temperature of the sensor, so that the measured temperature has deviation from the actual temperature, which is called heat conduction error. When studying the heat conduction error, the fiber bragg grating measuring end is generally equivalent to a straight fin, and the heat conduction error is roughly estimated according to a heat conduction formula of the fin, wherein the heat conduction error formula is shown as the following formula.

In the formula, T_tIs the total temperature of the air flow, T_jMeasuring temperature, T, for a total temperature probe grating_bMeasuring the temperature for the support temperature probe, wherein L is the length of the optical fiber in the stagnation cover, h is the convective heat transfer coefficient of the surface of the optical fiber in the stagnation cover, and lambda_mIs the fiber thermal conductivity and d is the fiber diameter.

Therefore, if the stent temperature T is measured_bThe heat conduction error can be corrected according to the above formula, so that the total temperature can be effectively measured.

Example 13:

a method for correcting heat conduction errors of a fiber grating total temperature measuring device comprises the following steps:

1) airflow temperature measurement data is acquired.

2) And acquiring bracket temperature measurement data.

3) And calculating to obtain correction data of the temperature measurement data according to the acquired airflow temperature measurement data and the acquired bracket temperature measurement data.

4) And correcting the total temperature measurement value of the high-speed airflow by using the correction data.