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Low-density wind tunnel flow field vibration temperature measurement method based on electron beam fluorescence technology

A vibration temperature and measurement method technology, applied in thermometer testing/calibration, thermometers, measuring devices, etc., can solve problems such as difficulty in implementation, and achieve convenient operation, accurate calibration, and reliable low-density wind tunnel flow field vibration temperature measurement method Effect

Active Publication Date: 2020-10-16
中国空气动力研究与发展中心超高速空气动力研究所
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Problems solved by technology

At present, the vibrational temperature is mainly calculated through the vibrational bands, but accurate spectral constants of various gas molecules and an ideal optical path without any influence are required, which is very difficult to achieve

Method used

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  • Low-density wind tunnel flow field vibration temperature measurement method based on electron beam fluorescence technology
  • Low-density wind tunnel flow field vibration temperature measurement method based on electron beam fluorescence technology
  • Low-density wind tunnel flow field vibration temperature measurement method based on electron beam fluorescence technology

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Embodiment 1

[0041] This embodiment presents the calibration steps used in the low-density wind tunnel flow field vibration temperature measurement method based on electron beam fluorescence technology and the calibrated low-density wind tunnel flow field vibration temperature measurement method of the present invention. The test conditions are: conical nozzle with Mach number 12, total pressure P 0 =1MPa, total temperature T 0 =600K.

[0042] Such as figure 1 , figure 2 As shown, the calibration device used in the low-density wind tunnel flow field vibration temperature measurement method based on electron beam fluorescence technology of the present invention includes an electron gun 2 installed in the test section 1 of the hypersonic low-density wind tunnel, installed in the hypersonic The Faraday cup 5 in the lower chamber of the test section 1 of the low-density wind tunnel. The Faraday cup 5 is used to receive the electron beam 3 emitted by the electron gun 2. The electron beam 3 ...

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Abstract

The invention discloses a low-density wind tunnel flow field vibration temperature measurement method based on an electron beam fluorescence technology. The measurement method comprises the followingsteps: firstly, obtaining a vibration temperature-characteristic wavelength intensity ratio calibration curve by using a calibration device; obtaining a spectral intensity ratio and a corresponding vibration temperature-characteristic wavelength intensity ratio calibration curve of each measuring point through the electron beam fluorescence vibration band images of the measuring points, calculating the vibration temperature of each measuring point, and drawing a low-density wind tunnel flow field vibration temperature distribution diagram. The low-density wind tunnel flow field vibration temperature measurement method based on the electron beam fluorescence technology is reliable, effective and convenient to operate, and calibration of the calibration device is accurate.

Description

technical field [0001] The invention belongs to the technical field of hypersonic low-density wind tunnel tests, and in particular relates to a method for measuring vibration temperature of a low-density wind tunnel flow field based on electron beam fluorescence technology. Background technique [0002] In the hypersonic low-density wind tunnel test, since the nitrogen in the air is a diatomic molecule, there will be a thermodynamic non-equilibrium effect in the rarefied flow, and the vibration temperature of the nitrogen gas molecule is inconsistent with the rotation temperature, so it is necessary to measure the vibration temperature of the nitrogen gas molecule and rotation temperature for the study of thermodynamic non-equilibrium effects. At present, electron beam fluorescence technology can be used to measure the vibration temperature and rotation temperature of gas in the flow field. Among them, the measurement of rotation temperature has a relatively mature technolog...

Claims

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Application Information

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IPC IPC(8): G01M9/04G01M9/06G01K15/00
CPCG01M9/04G01M9/065G01K15/005
Inventor 陈爱国田颖
Owner 中国空气动力研究与发展中心超高速空气动力研究所
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