摘要
The parameters of instability wave of supersonic mixing layer(Mc=0.5,M1=3.5/M2=1.4) are measured by flow visualization and calculated by means of two-dimensional direct numerical simulaitons of the compressible Navier-Stokes equations.In both cases of the mixing layer with harmonic disturbance or not,the comparative results indicate that the wavelength of the two-dimensional wave is equal to the vortex spacing in the streamwise direction because the difference between them is less than 1%.However,the measured convective velocity of the large-scale structure deviates from the theoretical isentropic prediction about 10%.Here the measured value confirms that Mc,2<Mc,1 for the supersonic-supersonic mixing layer.Furthermore,the pairing and intermittent phenomenon are recorded clearly by flow visualization.
The parameters of instability wave of supersonic mixing layer (M c =0.5, M 1=3.5/M 2=1.4) are measured by flow visualization and calculated by means of two-dimensional direct numerical simulaitons of the compressible Navier-Stokes equations. In both cases of the mixing layer with harmonic disturbance or not, the comparative results indicate that the wavelength of the two-dimensional wave is equal to the vortex spacing in the streamwise direction because the difference between them is less than 1%. However, the measured convective velocity of the large-scale structure deviates from the theoretical isentropic prediction about 10%. Here the measured value confirms that M c,2<M c,1 for the supersonic-supersonic mixing layer. Furthermore, the pairing and intermittent phenomenon are recorded clearly by flow visualization.
基金
Supported by the National Natural Science Foundation of China (Grant No.10772168)
