变热线过热比可压缩流湍流度测量方法优化

doi:10.7527/S1000-6893.2019.23067

Abstract

Abstract: In order to increase the measurement precision of a compressible flow, an optimization of turbulence level measurement technique is studied. By changing the overheat ratio of hot-wire anemometer and neglecting the pressure fluctuation terms in the governing equations, the turbulence level is solved. In order to evaluate the turbulence level in high speed flow more precisely, the algorithm for turbulence level based on response function of constant temperature hot-wire anemometer in compressible fluid is theoretically optimized by introducing pressure fluctuation. Turbulence level measurement experiments are carried out with the Mach number varied from 0.3 to 0.7 and the experimental data is processed by using algorithm of turbulence level before and after optimization. The results indicate that the magnitudes of turbulence level from the two methods are similar, but the variation tendency of turbulence level with Mach number obtained by using the optimized method is in accordance with the objective physical law. The uncertainty of turbulence level is obtained using Monte Carlo simulation, and the magnitude of the uncertainty is much smaller than that of the turbulence level. The results suggest that the turbulence level obtained using the optimized method could be regarded as the true values. The results proved the correctness of the turbulence level measurement technique after optimization and the feasibility of application of constant temperature hot-wire anemometer into turbulence level measurement in high speed wind tunnels.

Key words: compressible fluid, turbulence level, overheat ratio, Monte Carlo simulation, uncertainty

CLC Number:

V211.71

DU Yufeng, LIN Jun, WANG Xunnian, XIONG Neng. Measurement technique optimization of turbulence level in compressible fluid by changing overheat ratio of hot wire anemometer[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(12): 123067-123067.

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Measurement technique optimization of turbulence level in compressible fluid by changing overheat ratio of hot wire anemometer

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