阅读说明：本技术 一种测量高马赫数气流总温的装置 (Device for measuring total temperature of high-Mach number airflow ) 是由 杨兆欣 张文清 顾正华 盖文 曾星 于 2019-11-28 设计创作，主要内容包括：本发明提供了一种测量高马赫数气流总温的装置,该方案包括有内、外双层滞止罩的结构,并且内、外层排气孔的设置位置存在错位,能够解决高速气流的滞止问题；同时,双层滞止罩结构以及绝热层能够减少周围环境对于温度测试的影响；本方案结构设计简单易于保证加工和安装的一致性,减小结构特性对于温度测试的敏感性影响。(The invention provides a device for measuring the total temperature of high-Mach number airflow, which comprises an inner-layer stagnation cover structure and an outer-layer stagnation cover structure, wherein the arrangement positions of an inner-layer exhaust hole and an outer-layer exhaust hole are staggered, so that the stagnation problem of high-speed airflow can be solved; meanwhile, the double-layer stagnation cover structure and the heat insulation layer can reduce the influence of the surrounding environment on the temperature test; the scheme has simple structural design, is easy to ensure the consistency of processing and installation, and reduces the sensitive influence of structural characteristics on temperature test.)

1. A device for measuring the total temperature of high Mach number airflow is characterized in that: comprises an outer stagnation cover, an inner stagnation cover, a mounting disc and a temperature sensor; the outer stagnation cover and the inner stagnation cover are cylindrical cavities with two open ends and the same length; the outer stagnation cover is sleeved outside the inner stagnation cover; the axes of the outer layer stagnation cover and the inner layer stagnation cover are overlapped; one end of the inner stagnation cover and one end of the outer stagnation cover are fixedly arranged on the mounting disc; a plurality of outer layer exhaust holes are symmetrically formed in the side wall of the outer layer stagnation cover along the axis; a plurality of inner-layer exhaust holes are symmetrically formed in the side wall of the inner-layer stagnation cover along the axis; the inner-layer exhaust hole penetrates out of the outer-layer stagnation cover through the air pipe; the distance between the inner layer exhaust holes and the mounting disc is not equal to the distance between the outer layer exhaust holes and the mounting disc; the axis of the temperature sensor coincides with the axis of the inner-layer stagnation cover and is not in contact with the side wall of the inner-layer stagnation cover.

2. An apparatus according to claim 1, wherein the apparatus is adapted to measure the total temperature of the high mach number stream: the mounting disc is provided with a through hole at the axis of the inner stagnation cover; the temperature sensor extends into the inner stagnation cover through the through hole; the temperature sensor is fixed at the through hole of the mounting plate through sealant and seals the through hole.

3. An apparatus according to claim 1, wherein the apparatus is adapted to measure the total temperature of the high mach number stream: the outer layer exhaust hole and the inner layer exhaust hole are positioned on the same horizontal plane.

4. An apparatus according to claim 1, wherein the apparatus is adapted to measure the total temperature of the high mach number stream: and a heat insulation layer is filled between the inner stagnation cover and the temperature sensor.

5. An apparatus according to claim 1, wherein the apparatus is adapted to measure the total temperature of the high mach number stream: the distance between the inner layer exhaust holes and the mounting disc is smaller than that between the outer layer exhaust holes and the mounting disc.

6. An apparatus according to claim 1, wherein the apparatus is adapted to measure the total temperature of the high mach number stream: the inner stagnation cover and the outer stagnation cover are fixed on the mounting disc in a threaded or welding mode.

7. An apparatus according to claim 1, wherein the apparatus is adapted to measure the total temperature of the high mach number stream: the material of the heat insulation layer is polytetrafluoroethylene.

Technical Field

The invention relates to the field of total temperature testing of airflows, in particular to a device for measuring the total temperature of an airflow with a high Mach number.

Background

In many technical fields, the total temperature of the airflow needs to be tested, and the purpose of researching the total temperature testing device of the airflow is to reduce the influence of the surrounding environment on the test result through the design of the testing device. The difficulty is how to stop the high-speed airflow speed, and the balance between the temperature of the stopped airflow and the temperature of the sensor is the basis for accurate test.

At present, a common airflow total temperature testing device comprises:

the installation direction of a sensor of the transverse total temperature testing device is vertical to the direction of air flow, and the axis direction of an air inlet pipe cavity of the transverse total temperature testing device is vertical to the direction of the air flow. However, the overall dimension is mainly determined by experimental data, the processing and manufacturing consistency is difficult to ensure, the air flow velocity cannot be stopped, and the air flow velocity is very sensitive to the deflection angle of the air flow direction.

Longitudinal total temperature testing device: the sensor mounting direction of the device is parallel to the airflow direction, and the axis direction of the air inlet pipe cavity of the device is parallel to the airflow direction.

The vertical and horizontal total temperature testing device comprises: the sensor of the device is arranged in a direction vertical to the airflow direction, and the axial direction of the air inlet pipe cavity of the device is parallel to the airflow direction.

In summary, the conventional total temperature testing device cannot simultaneously solve the problems of the processing technology and the stagnation of the velocity of the high-speed airflow, and cannot test the total temperature parameter with high precision under the condition of the high-speed airflow.

Disclosure of Invention

The invention aims to provide a technical scheme of a device for measuring the total temperature of airflow with high Mach number, aiming at the defects in the prior art.

The scheme is realized by the following technical measures:

a device for measuring the total temperature of high Mach number airflow is characterized in that: comprises an outer stagnation cover, an inner stagnation cover, a mounting disc and a temperature sensor; the outer stagnation cover and the inner stagnation cover are cylindrical cavities with two open ends and the same length; the outer stagnation cover is sleeved outside the inner stagnation cover; the axes of the outer stagnation cover and the inner stagnation cover are superposed; one end of the inner stagnation cover and one end of the outer stagnation cover are fixedly arranged on the mounting disc; a plurality of outer layer exhaust holes are symmetrically arranged on the side wall of the outer layer stagnation cover; a plurality of inner-layer exhaust holes are symmetrically arranged on the side wall of the inner-layer stagnation cover along the axis; the inner-layer exhaust hole penetrates out of the outer-layer stagnation cover through the air pipe; the distance between the inner layer exhaust holes and the mounting disc is not equal to the distance between the outer layer exhaust holes and the mounting disc; the axis of the temperature sensor is coincident with the axis of the inner stagnation cover and is not contacted with the side wall of the inner stagnation cover.

The scheme is preferably as follows: the mounting disc is provided with a through hole at the axis of the inner stagnation cover; the temperature sensor extends into the inner stagnation cover through the through hole; the temperature sensor is fixed at the through hole of the mounting plate through sealant and seals the through hole.

The scheme is preferably as follows: the outer layer exhaust hole and the inner layer exhaust hole are positioned on the same horizontal plane.

The scheme is preferably as follows: and a heat insulation layer is filled between the inner stagnation cover and the temperature sensor.

The scheme is preferably as follows: the distance between the inner layer exhaust hole and the mounting disc is smaller than that between the outer layer exhaust hole and the mounting disc.

The scheme is preferably as follows: the inner stagnation cover and the outer stagnation cover are fixed on the mounting plate in a threaded or welding mode.

The scheme is preferably as follows: the material of the heat insulation layer is polytetrafluoroethylene.

The beneficial effect of this scheme can be known according to the statement to above-mentioned scheme, because adopt the structure of inside and outside double-deck stagnation cover in this scheme to there is the dislocation in the position that sets up of inside and outside layer exhaust hole, can solve the stagnation problem of high-speed air current, can reduce the influence of surrounding environment to the temperature test simultaneously, reduces the influence of structural feature to the sensitivity of temperature test.

Therefore, compared with the prior art, the invention has substantive characteristics and progress, and the beneficial effects of the implementation are also obvious.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

In the figure, 1 is an outer layer stagnation cover, 2 is an outer layer exhaust hole, 3 is an inner layer stagnation cover, 4 is an air pipe, 5 is an inner layer exhaust hole, 6 is a temperature sensor, 7 is a heat insulating layer, and 8 is an installation disc.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

As shown in fig. 1, the scheme includes an outer stagnation cover, an inner stagnation cover, a mounting plate and a temperature sensor; the outer stagnation cover and the inner stagnation cover are cylindrical cavities with two open ends and the same length; the outer stagnation cover is sleeved outside the inner stagnation cover; the axes of the outer stagnation cover and the inner stagnation cover are superposed; one end of the inner stagnation cover and one end of the outer stagnation cover are fixedly arranged on the mounting disc; a plurality of outer layer exhaust holes are symmetrically arranged on the side wall of the outer layer stagnation cover; a plurality of inner-layer exhaust holes are symmetrically arranged on the side wall of the inner-layer stagnation cover along the axis; the inner-layer exhaust hole penetrates out of the outer-layer stagnation cover through the air pipe; the distance between the inner layer exhaust holes and the mounting disc is not equal to the distance between the outer layer exhaust holes and the mounting disc; the axis of the temperature sensor is coincident with the axis of the inner stagnation cover and is not contacted with the side wall of the inner stagnation cover. The mounting disc is provided with a through hole at the axis of the inner stagnation cover; the temperature sensor extends into the inner stagnation cover through the through hole; the temperature sensor is fixed at the through hole of the mounting plate through sealant and seals the through hole. The outer layer exhaust hole and the inner layer exhaust hole are positioned on the same horizontal plane. And a heat insulation layer is filled between the inner stagnation cover and the temperature sensor. The distance between the inner layer exhaust hole and the mounting disc is smaller than that between the outer layer exhaust hole and the mounting disc. The inner stagnation cover and the outer stagnation cover are fixed on the mounting plate in a threaded or welding mode. The material of the heat insulation layer is polytetrafluoroethylene.

When the total temperature of the airflow is measured, the placement direction of the stagnation cover ensures that the axes of the outer layer stagnation cover and the inner layer stagnation cover are parallel to the movement direction of the airflow, the airflow with high Mach number enters from the opening end of the inner layer stagnation cover, the airflow stagnation and the velocity reduction of the inner layer stagnation cover carry out heat exchange with the temperature sensor, and the airflow flows out of the stagnation cover through the air pipe. Meanwhile, high-Mach number airflow enters from the opening end of the outer stagnation cover and flows through the stagnation of the airflow of the outer stagnation cover to reduce the speed, so that the temperature of the outer stagnation cover and the temperature of the inner stagnation cover are balanced, the interference of the surrounding environment on the temperature measurement environment of the temperature sensor is reduced, the stagnation of the high-speed airflow can be realized by adopting the structural design, the influence of environmental factors on the temperature measurement environment of the temperature sensor can be reduced, and the total temperature measurement of the high-precision airflow is facilitated.

The double-layer stagnation cover structure and the heat insulating layer arranged inside the double-layer stagnation cover structure can reduce the influence of the surrounding airflow environment on the heat transfer process of the total temperature test to the maximum extent.

This scheme structural design is simple, does not have complicated structural design, can guarantee the uniformity of processing and installation, reduces the influence of device structural characteristic to total temperature test.

The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.