阅读说明：本技术 基于流场温度测量的测温探头及测温系统 (Temperature measuring probe and temperature measuring system based on flow field temperature measurement ) 是由 吴锋 张雁 钱伟中 张志宏 杨彩琼 张世雅 于 2021-08-19 设计创作，主要内容包括：本发明公开了基于流场温度测量的测温探头及测温系统,属于测温技术领域,包括导热套管、荧光温敏材料层和耐高温氧化物晶体光纤,荧光温敏材料层设于导热套管内,耐高温氧化物晶体光纤与荧光温敏材料层接触；所述导热套管的导热率大于200W/mK。本发明采用耐高温氧化物晶体光纤,抗干扰能力强,且耐高温,能够适应强电场、强磁场的航空发动机宽跨度测温环境；采用导热率高的导热套管快速响应温度场的变化,实现对流场温度变化的追踪,进而实现复杂气流场温度高频响应,满足温度畸变高温升率等航空发动机特种试验温度测量需求。(The invention discloses a temperature measuring probe and a temperature measuring system based on flow field temperature measurement, belonging to the technical field of temperature measurement and comprising a heat conduction sleeve, a fluorescent temperature-sensitive material layer and a high-temperature-resistant oxide crystal optical fiber, wherein the fluorescent temperature-sensitive material layer is arranged in the heat conduction sleeve, and the high-temperature-resistant oxide crystal optical fiber is in contact with the fluorescent temperature-sensitive material layer; the heat conductivity of the heat conduction sleeve is more than 200W/mK. The high-temperature-resistant oxide crystal optical fiber is adopted, has strong anti-interference capability and high temperature resistance, and can adapt to wide-span temperature measurement environments of aeroengines with strong electric fields and strong magnetic fields; the heat conduction sleeve with high heat conductivity is adopted to quickly respond to the change of the temperature field, so that the tracking of the temperature change of the flow field is realized, the high-frequency response of the temperature of the complex airflow field is further realized, and the temperature measurement requirements of special test temperatures of the aero-engine such as temperature distortion high temperature rise rate are met.)

1. The utility model provides a temperature probe based on flow field temperature measurement which characterized in that: the temperature-sensitive fluorescent material comprises a heat-conducting sleeve (1), a temperature-sensitive fluorescent material layer (2) and a high-temperature-resistant oxide crystal optical fiber (3), wherein the temperature-sensitive fluorescent material layer (2) is arranged in the heat-conducting sleeve (1), and the high-temperature-resistant oxide crystal optical fiber (3) is in contact with the temperature-sensitive fluorescent material layer (2); the heat conductivity of the heat conduction sleeve (1) is more than 200W/mK.

2. The temperature probe based on flow field temperature measurement of claim 1, characterized in that: the heat conduction sleeve (1) is a diamond sleeve.

3. The temperature probe based on flow field temperature measurement of claim 2, characterized in that: the thickness of the diamond sleeve is 0.5-1mm, and the length of the diamond sleeve is 5-10 mm.

4. The temperature probe based on flow field temperature measurement of claim 1, characterized in that: the fluorescent temperature-sensitive material layer (2) is any one of a rare earth doped oxide fluorescent material and a transition group ion doped fluorescent material.

5. The temperature probe based on flow field temperature measurement of claim 1, characterized in that: the thickness of the fluorescent temperature-sensitive material layer (2) is 0.3-0.5 μm.

6. The temperature probe based on flow field temperature measurement of claim 1, characterized in that: the high-temperature-resistant oxide crystal optical fiber (3) is any one of sapphire, yttrium aluminum garnet and spinel.

7. The temperature probe based on flow field temperature measurement of claim 1, characterized in that: the temperature measuring probe further comprises a viscose agent (4) used for filling a gap between the high-temperature-resistant oxide crystal optical fiber (3) and the heat-conducting sleeve (1) at the opening of the heat-conducting sleeve (1).

8. The temperature probe based on flow field temperature measurement of claim 1, characterized in that: the temperature measuring probe also comprises an optical fiber connector (5), and the optical fiber connector (5) is connected with the high-temperature-resistant oxide crystal optical fiber (3).

9. The utility model provides a temperature measurement system based on flow field temperature measurement which characterized in that: the temperature measurement probe comprises the temperature measurement probe according to any one of claims 1 to 8, and further comprises a Y-shaped optical fiber (6), a fluorescence excitation light source (7) and a fluorescence signal processing subsystem (9), wherein the temperature measurement probe, the fluorescence excitation light source (7) and the fluorescence signal processing subsystem (9) are respectively connected to one end of the Y-shaped optical fiber (6).

10. The temperature measurement system based on flow field temperature measurement of claim 9, characterized in that: the temperature measuring system also comprises a cut-off filter (8), and the Y-shaped optical fiber (6) is connected with the fluorescence signal processing subsystem (9) through the cut-off filter (8).

Technical Field

The invention relates to the technical field of temperature measurement, in particular to a temperature measurement probe and a temperature measurement system based on flow field temperature measurement.

Background

Aircraft engines are constantly evolving towards higher performance, higher thrust-to-weight ratios as a source of power for modern aircraft, which results in higher and higher operating temperatures for high performance aircraft engines. The distortion of the total temperature of an inlet of an aircraft engine can cause the performance of the engine to be deteriorated, and the engine can be flamed out seriously. The temperature distortion test is therefore of particular importance in the development of engines. In a temperature distortion test, the flow field condition is very complex, the temperature change of an engine inlet is very severe, and the temperature rise rate is extremely high. Therefore, accurate measurement of engine inlet dynamic temperature is extremely important to study engine performance. In order to solve the complex environment of temperature distortion of an aircraft engine, researchers try to measure the temperature of an inlet of the engine by various temperature measuring technologies, mainly including means of temperature measurement by thermocouples, crystals, infrared radiation and the like, but the existing temperature measuring technologies have various defects and are difficult to satisfy results.

The fluorescence temperature sensing technology is concerned by people from the 80 s of the 20 th century, and the basic working principle of the fluorescence type temperature sensor is as follows: under a certain condition, the change of the fluorescence intensity, the fluorescence lifetime and the fluorescence spectrum wavelength position of the fluorescence emitter is related to the parameters such as the temperature and the pressure of the environment where the fluorescence emitter is located, and the parameters such as the temperature and the pressure of the environment where the fluorescence emitter is located can be known by detecting the change of the fluorescence intensity, the fluorescence lifetime and the fluorescence spectrum wavelength position of the fluorescence emitter, so that various fluorescent materials can be applied to sensing measurement of the parameters such as the temperature and the pressure. However, when the existing fluorescent temperature sensor is applied to the complex flow field condition of the aero-engine, the problem of low fluorescence dynamic temperature measurement frequency response still exists, and the temperature measurement requirements of special tests of the aero-engine such as high temperature rise rate due to temperature distortion cannot be met.

Disclosure of Invention

The invention aims to solve the problem of low dynamic temperature measurement frequency response in the prior temperature measurement technology, and provides a temperature measurement probe and a temperature measurement system based on flow field temperature measurement.

The purpose of the invention is realized by the following technical scheme: the temperature measuring probe based on flow field temperature measurement comprises a heat conduction sleeve, a fluorescent temperature-sensitive material layer and a high-temperature-resistant oxide crystal optical fiber, wherein the fluorescent temperature-sensitive material layer is arranged in the heat conduction sleeve, and the high-temperature-resistant oxide crystal optical fiber is in contact with the fluorescent temperature-sensitive material layer; the heat conductivity of the heat conduction sleeve is more than 200W/mK.

In one example, the thermally conductive sleeve is a diamond sleeve.

In one example, the diamond sleeve has a thickness of 0.5-1mm and a length of 5-10 mm.

In one example, the fluorescent temperature-sensitive material layer is any one of a rare earth doped oxide fluorescent material and a transition group ion doped fluorescent material.

In one example, the thickness of the fluorescent temperature-sensitive material layer is 0.3-0.5 μm.

In one example, the refractory oxide crystal fiber is any one of sapphire, yttrium aluminum garnet, and spinel.

In one example, the temperature measuring probe further comprises a viscose agent for filling a gap between the high temperature resistant oxide crystal optical fiber and the heat conducting sleeve at the opening of the heat conducting sleeve.

In one example, the temperature measuring probe further comprises an optical fiber connector, and the optical fiber connector is connected with the high-temperature-resistant oxide crystal optical fiber.

It should be further noted that the technical features corresponding to the above examples can be combined with each other or replaced to form a new technical solution.

The invention also comprises a temperature measurement system based on flow field temperature measurement, which comprises the temperature measurement probe described in any one of the above examples, and the temperature measurement system further comprises a Y-shaped optical fiber, a fluorescence excitation light source and a fluorescence signal processing subsystem, wherein the temperature measurement probe, the fluorescence excitation light source and the fluorescence signal processing subsystem are respectively connected to one end of the Y-shaped optical fiber.

In one example, the temperature measuring system further comprises a cut-off filter, and the Y-shaped optical fiber is connected with the fluorescence signal processing subsystem through the cut-off filter.

Compared with the prior art, the invention has the beneficial effects that:

(1) in one example, the high-temperature-resistant oxide crystal optical fiber is adopted, has strong anti-interference capability and high temperature resistance, and can adapt to wide-span temperature measurement environments of aeroengines with strong electric fields and strong magnetic fields; the heat conducting sleeve with high heat conductivity (more than 200W/mK) is adopted to quickly respond to the change of the temperature field, so that the tracking of the temperature change of the flow field is realized, the high-frequency response of the temperature of the complex airflow field is further realized, and the temperature measurement requirements of special test temperatures of the aeroengine such as temperature distortion high temperature rise rate and the like are met.

(2) In one example, the invention adopts the diamond sleeve, the heat conduction efficiency of the diamond is extremely high, the change of the temperature field can be quickly responded, the thermal response time is better than 15ms, and the small-inertia thermocouple can track the change of the temperature of the flow field more quickly than the existing thermocouple, so that the problem of high frequency response of fluorescence dynamic temperature measurement is solved.

(3) In one example, the diamond sleeve, the fluorescent temperature-sensitive material layer and the high-temperature-resistant oxide crystal optical fiber have small sizes (mm level), can adapt to different temperature measuring environments, and have wide application range.

(4) In one example, the temperature measuring probe can be connected with an external temperature measuring system through the optical fiber connector, the temperature measuring probe is easy to carry and install, and inconvenience caused by dragging of the optical fiber of the fluorescent optical fiber sensor and insufficient length of the optical fiber is eliminated.

(5) In one example, the temperature measuring system comprises a temperature measuring probe, so that the temperature measuring probe is suitable for wide-span temperature measuring environments of aeroengines with strong electric fields and strong magnetic fields, and high-precision, quick-response and multi-dimensional temperature measurement of complex airflow fields is realized.

(6) In an example, the temperature measurement system further comprises a cut-off filter for filtering the excitation light signal in the fluorescence signal, so that the temperature measurement accuracy of the temperature measurement system is ensured, and the reliability is high.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.

FIG. 1 is a schematic view of a temperature probe in accordance with an example of the present invention;

FIG. 2 is a schematic diagram of a temperature measurement system in accordance with an example of the present invention.

In the figure: the system comprises a heat conduction sleeve 1, a fluorescent temperature-sensitive material layer 2, a high-temperature-resistant oxide crystal optical fiber 3, an adhesive 4, an optical fiber connector 5, Y-shaped light 6, a fluorescent excitation light source 7, a cut-off filter 8 and a fluorescent signal processing subsystem 9.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are directions or positional relationships based on the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, the temperature measuring probe based on flow field temperature measurement specifically includes a heat conducting sleeve 1, a fluorescent temperature sensitive material layer 2 and a high temperature resistant oxide crystal optical fiber 3, wherein the fluorescent temperature sensitive material layer 2 is arranged in the heat conducting sleeve 1, and the high temperature resistant oxide crystal optical fiber 3 is in contact with the fluorescent temperature sensitive material layer 2; the heat conductivity of the heat conduction sleeve 1 is more than 200W/mK. Specifically, one end of a heat conduction sleeve 1 is sealed, the other end of the heat conduction sleeve is provided with an opening, and the sealed end of the heat conduction sleeve 1 is coated with a fluorescent temperature-sensitive material; one end of the high-temperature-resistant oxide crystal optical fiber 3 is contacted with the fluorescent temperature-sensitive material, and the other end extends to the outside through the opening of the heat-conducting sleeve 1. The material of the heat conducting sleeve 1 includes, but is not limited to, diamond material, silver material, copper material, gold material, and other materials with high heat conductivity. In the example, the high-temperature-resistant oxide crystal optical fiber 3 is adopted, so that the high-temperature-resistant aeroengine temperature measurement device is high in anti-interference capability and high-temperature-resistant, can adapt to wide-span (500- & ltSUB & gt 1100- & gt K) temperature measurement environments of aeroengines with strong electric fields and strong magnetic fields, and is stable in work and long in service life; the heat conducting sleeve 1 with high heat conductivity (more than 200W/mK) is adopted to quickly respond to the change of the temperature field, so that the tracking of the temperature change of the flow field is realized, the high-frequency response of the temperature of the complex airflow field is further realized, and the temperature measurement requirements of special test temperatures of the aeroengine such as temperature distortion high temperature rise rate and the like are met.

In one example, the heat conducting sleeve 1 is a diamond sleeve, the heat conducting efficiency of diamond is very high, the change of a temperature field can be quickly responded, the thermal response time is 10-15ms, and the change of the temperature of the flow field can be tracked more quickly than that of the existing thermocouple and a small-inertia thermocouple, so that the problem of fluorescence dynamic temperature measurement high-frequency response is solved.

In one example, the diamond sleeve is 0.8mm thick and 8mm long; as an option, the inner diameter of the diamond sleeve is 0.5 mm-1.0 mm, preferably 0.8mm, which meets the micro-size design of the temperature measuring probe.

In one example, the fluorescent temperature-sensitive material layer 2 is any one of a rare earth doped oxide fluorescent material and a transition group ion doped fluorescent material, so that electrons in the fluorescent material generate energy level transition under the action of excitation light, and visible emergent light is generated in the energy level transition process, and the energy of the emergent light is less than that of the excitation light. As an option, the fluorescent temperature-sensitive material layer 2 is formed by any one of powder, crystal and polycrystal and is disposed inside the heat-conducting sleeve 1.

In one example, the thickness of the fluorescent temperature-sensitive material layer 2 is 0.4 μm, which satisfies the micro-size design of the temperature probe.

In one example, the refractory oxide crystal fiber 3 is any one of sapphire (Al2O3), yttrium aluminum garnet (Y3Al5O12), and spinel (MgAl2O4), and has low optical loss, high temperature resistance, and high mechanical strength. More specifically, the length of the high-temperature-resistant oxide crystal optical fiber 3 is 200 mm-400 mm, preferably 300 mm; the diameter of the optical fiber is 500-1000 μm, preferably 800 μm; the optical loss is less than 0.3 dB/m.

In one example, as shown in fig. 2, the temperature probe further includes a glue 4, such as an optical epoxy glue layer, for filling a gap between the refractory oxide crystal fiber 3 and the heat-conducting sleeve 1 at the opening of the heat-conducting sleeve 1.

In one example, the temperature measuring probe further comprises an optical fiber connector 5, the optical fiber connector 5 is connected with the high-temperature-resistant oxide crystal optical fiber 3, the temperature measuring probe can be connected with an external temperature measuring system through the optical fiber connector 5, and the temperature measuring probe is easy to carry and mount and gets rid of inconvenience caused by insufficient length of the optical fiber and the optical fiber dragging of the fluorescence optical fiber sensor when being connected with the fluorescence excitation light source 7 and/or the fluorescence signal processing subsystem 9.

In one example, the present invention further includes a temperature measurement system based on flow field temperature measurement, where the temperature measurement system includes the temperature measurement probe described in any one of the above examples, and further includes a Y-shaped optical fiber 6, a fluorescence excitation light source 7, and a fluorescence signal processing subsystem 9, and the temperature measurement probe, the fluorescence excitation light source 7, and the fluorescence signal processing subsystem 9 are respectively connected to one end of the Y-shaped optical fiber 6. Preferably, the temperature measuring probe is connected with one end of the Y-shaped optical fiber 6 through the optical fiber connector 5; the fluorescence signal processing subsystem 9 comprises an infrared spectrum acquisition system and an embedded computer system which are connected in sequence, wherein the infrared spectrum acquisition system is used for converting optical signals into electric signals and transmitting the electric signals to the embedded computer system, and the embedded computer system is used for analyzing the fluorescence intensity and/or fluorescence intensity ratio and/or fluorescence life of emergent light. The working principle of the temperature measuring system is that when a high-temperature air mass flows through the temperature measuring probe, excitation light emitted by the fluorescence excitation light source 7 is guided into the fluorescence temperature-sensitive material layer 2 of the temperature measuring probe through the Y-shaped (quartz) optical fiber 6, emergent light generated by the fluorescence temperature-sensitive material is guided into the fluorescence signal processing subsystem 9 through the Y-shaped optical fiber 6, and high-frequency response temperature measurement is further realized by analyzing the fluorescence intensity and/or the fluorescence intensity ratio and/or the fluorescence service life of the emergent light. The temperature measurement system comprises a temperature measurement probe, so that the temperature measurement system is suitable for wide-span temperature measurement environments of aeroengines with strong electric fields and strong magnetic fields, and high-precision, quick-response and multi-dimensional temperature measurement of complex airflow fields is realized.

In an example, the system further comprises a cut-off filter 8, the Y-shaped optical fiber is connected with the fluorescence signal processing subsystem 9 through the cut-off filter 8, and is used for filtering an excitation light signal in the fluorescence signal, so that the temperature measurement accuracy of the temperature measurement system is ensured, and the reliability is high.

The above detailed description is for the purpose of describing the invention in detail, and it should not be construed that the detailed description is limited to the description, and it will be apparent to those skilled in the art that various modifications and substitutions can be made without departing from the spirit of the invention.