Research on Measurement Method of Gas Velocity Combined Absorption Spectroscopy Technique and Cross-Correlation
LIU Pei-jin1, WANG Zhi-xin1, YANG Bin2, WEI Xiang-geng1
1. Science and Technology on Combustion, Internal Flow and Thermal-Structure Laboratory, Northwestern Polytechnical University, Xi’an 710072, China 2. Institute of Particle and Two-phase Flow Measurement/Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract：For the small frequency shift and large error of tunable diode laser absorption spectroscopy (TDLAS) velocity method based on Doppler Effect in measuring the gas velocity, velocity measurement method combined fixed wavelength absorption spectroscopy and cross correlation is proposed in this paper. Considering the characteristics of the hydrocarbon fuel combustion products, 7 158.597 cm- 1 absorption line of H2O molecular was selected. Through arranging two beams of fixed wavelength absorption measurement point of upstream and downstream, the gas velocity can be calculated by analyzing the cross-correlation properties of the two signals. The flat flame burner experiment system was used in the experimental research of the velocity measurement. The change of gas velocity with time under variable working condition was obtained. Under the same condition, numerical calculation is carried out. And the measurement results are compared with the results of the numerical simulation with relative deviation less than 8%. Then the method is preliminarily applied to measure the high speed plume of the kerosene-fueled Rocket Based Combined Cycle (RBCC) engine, and the upstream and downstream fluctuant signals of detectors were obtained. The velocity of the plume was calculated with cross correlation analysis which verifies the feasibility of this method. The experimental results show that the gas velocity measurement method has a wide measuring range with high measuring accuracy and little environment interference. The method proposed in this paper provides a simple and reliable method for the measurement of engine gas velocity.
刘佩进1，王志新1，杨 斌2，魏祥庚1 . 结合吸收光谱与互相关法的燃气速度测量方法研究 [J]. 光谱学与光谱分析, 2017, 37(02): 532-536.
LIU Pei-jin1, WANG Zhi-xin1, YANG Bin2, WEI Xiang-geng1 . Research on Measurement Method of Gas Velocity Combined Absorption Spectroscopy Technique and Cross-Correlation . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(02): 532-536.
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