A probe temperature calibration device for low temperature high Mach number test
A high Mach number and calibration device technology, applied in measuring devices, thermometer testing/calibration, thermometers, etc., can solve problems such as different reheating ratios, dissimilar flows, and inability to meet sufficient temperature test accuracy to achieve accurate calibration results , the effect of reducing the amount of data
Active Publication Date: 2020-04-07
BEIHANG UNIV
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Problems solved by technology
[0008] The current method is also unable to meet the sufficient temperature measurement accuracy, the main reason is that the standard probe measurement The difference in airflow structure caused by structural differences between the standard probe and the probe to be tested, the influence of dissimilar flow and different reheating ratios are not considered
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[0020] The technical solutions of the present invention will be further described below in conjunction with the drawings and embodiments.
[0021] The invention provides a probe temperature calibration device for low temperature high Mach number test. Such as figure 1 As stated, the device mainly includes a calibration wind tunnel part and a testing part. The calibration wind tunnel part includes a continuous air source 1, an electric heater 2, an intake valve 3, and a calibration wind tunnel 4. The test part is located in the voltage stabilization section and the convergence section of the calibration wind tunnel, including a moving column 5, a standard temperature probe 6, a temperature probe 7 to be tested, a temperature probe 8 with the same structure as the temperature probe to be tested, and a data acquisition system 9, computer 10. Calibration wind tunnel 4 adopts blowing type wind tunnel, the flow is relatively stable, and it is not easy to surge. The continuous ai...
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The invention discloses a probe temperature calibration device for a low-temperature high-mach-number test. An aero-engine fan / gas compressor is relatively low in single-stage pressure ratio, and is in a working state of high air inlet mach number and low temperature rise; and the temperature rise test is difficult to obtain accurate power and efficiency evaluation. The root cause of the problem is that the heat exchange coefficient of a sensor cannot be accurately obtained under the condition of low temperature and high mach number, and the existing calibration method for the temperature tests in China cannot well solve the test precision problem; therefore, the invention provides a method for mutual comparison of a temperature probe so as to solve the problem of testing precision of thetemperature. According to the invention, two identical to-be-measured probes which are completely identical are used for mutual comparison on a calibration wind tunnel, and then the standard temperature probe is used for calibrating the complex temperature ratio, and the temperature testing result can be well corrected. On the basis, the calibration device provided by the invention not only can calibrate the complex temperature ratio difference caused by the mach number, and the influence of the total temperature, the total pressure and the airflow angle on the complex temperature ratio can becalibrated at the same time.
Description
Technical field: [0001] The invention relates to a probe temperature calibration device for low temperature and high Mach number testing, which is used to solve the problem of inaccurate temperature testing under the condition of low temperature and high Mach number, and specifically relates to a calibration device for gas temperature measurement, which belongs to the field of gas temperature measurement. Background technique [0002] In the measurement of steady-state airflow temperature, the measurement method of temperature probe with contact measurement is often used. Using a temperature probe will bring about a problem. The kinetic energy of the airflow cannot be completely restored to heat energy. This is because when the temperature probe is immersed in the airflow Medium time will create a new thermal equilibrium that differs from the temperature of the undisturbed airflow. The new heat balance is mainly caused by radiation between the probe and the environment, heat...
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IPC IPC(8): G01K15/00
CPCG01K15/005
Inventor 桂幸民周成华闫嘉祥宋满祥金东海
Owner BEIHANG UNIV