跨声速流场扰动模态与湍流度精细测量

Abstract

Abstract:

Fine measurement for the compressible flow fluctuation mode and turbulence level in transonic wind tunnels is studied to satisfy the need of low turbulence flow tests for high speed aircraft. Based on the measurement of varying hot wire overheat ratio， we derive the functions of the general mode and three special modes including the vorticity mode， the entropy mode and the acoustic mode for transonic flow fluctuations. An experiment is then conducted based on this method， obtaining fluctuation diagrams of the general mode， the vorticity mode， and the acoustic mode， calculating a high accuracy turbulence level， adopting fluctuation diagram analysis in frequency domain to rationalize the flow mechanism at Ma 1.50， and building a measurement method for the fluctuation mode and the low turbulence level. When the Mach number varies from 0.20 to 1.50 in the new type continuous transonic wind tunnel， the turbulence level is around 0.037%-0.197%， with the nonlinear function fitness goodness of data around 0.943-0.995 and the Monte Carlo simulation uncertainty around 0.000 2%-0.004 1%. Results show the effectiveness of the measurement method for the fluctuation mode and low turbulence level， exhibiting practical value for flow field quality evaluation and optimization， and low turbulence test of high speed aircraft in high-performance transonic wind tunnels.

Key words: compressible flow, fluctuation mode, turbulence level, hot wire anemometer, transonic wind tunnel, continuous wind tunnel

CLC Number:

V211.7

Bo ZHU, Daxiong LIAO, Zhenhua CHEN, Jiming CHEN. Fine measurement for fluctuation mode and turbulence level in transonic flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(4): 126378-126378.

Figures/Tables 12

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Table 1

Measurement results in flow field test

试验段Ma	流量脉动<m>/%	温度脉动 <T₀>/%	相关系数 $R m T 0$	非线性方程拟合优度	湍流度 <u>/%	密度脉动 <ρ>/%	不确定度/%
0.20	0.059	0.021	0.508	0.943	0.058	0.001	0.000 9
0.30	0.074	0.021	0.455	0.988	0.071	0.003	0.000 4
0.40	0.074	0.034	1.617	0.987	0.070	0.005	0.001 2
0.50	0.051	0.034	0.057	0.961	0.047	0.005	0.001 6
0.60	0.046	0.033	0.065	0.975	0.041	0.006	0.000 7
0.70	0.065	0.046	0.732	0.981	0.054	0.011	0.000 3
0.80	0.134	0.052	0.958	0.960	0.107	0.027	0.003 8
0.90	0.149	0.038	0.892	0.980	0.112	0.037	0.000 6
0.95	0.264	0.082	0.846	0.951	0.193	0.070	0.002 3
1.00	0.118	0.042	0.705	0.975	0.084	0.034	0.001 1
1.05	0.053	0.027	0.056	0.984	0.037	0.016	0.000 9
1.10	0.068	0.046	0.289	0.992	0.046	0.022	0.000 2
1.15	0.071	0.038	0.168	0.987	0.046	0.024	0.000 7
1.20	0.117	0.035	0.081	0.982	0.074	0.043	0.000 9
1.30	0.183	0.058	0.411	0.987	0.109	0.074	0.000 9
1.40	0.295	0.130	0.579	0.952	0.165	0.130	0.004 1
1.50	0.375	0.076	0.050	0.995	0.197	0.178	0.000 6

Table 1

Fig. 6

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Fine measurement for fluctuation mode and turbulence level in transonic flow

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