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展向速度
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  spanwise velocity
The system has been used to measure the statistics of the streamwise and spanwise velocity gradients in a turbulent boundary layer.
      
As compared to the spanwise velocity fluctuations the streamwise turbulence intensity is especially sensitive to temperature deviations.
      
In this paper, we report our investigations of the flow structure around a reattachment region using an ultrasound velocity profiler to measure the spanwise velocity component as a function of the spanwise coordinate and time.
      
The low-frequency component of the spanwise velocity fluctuation becomes dominant in the near-wall region, with peaks in the power spectrum at frequencies fh/Uc=0.05 and fh/Uc=0.012.
      
It was found that the local streamwise and spanwise velocity gradients play a significant role in the formation of different types of instability.
      
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In order to enhance the mixing efficiency, the effects of spanwise curvature, spanwise velocity and Mach number are studied by the method of DNS. When the spanwise velocity is fixed, the larger the spanwise curvature, the larger growth rate of the 3-D disturbances will be for the 3-D compressible mixing layer with the spanwise curvature. The increase of spanwise velocity can also enhance the ability of blending when the spanwise curvature is not zero. The spanwise vorticity produced by high frequency disturbance...

In order to enhance the mixing efficiency, the effects of spanwise curvature, spanwise velocity and Mach number are studied by the method of DNS. When the spanwise velocity is fixed, the larger the spanwise curvature, the larger growth rate of the 3-D disturbances will be for the 3-D compressible mixing layer with the spanwise curvature. The increase of spanwise velocity can also enhance the ability of blending when the spanwise curvature is not zero. The spanwise vorticity produced by high frequency disturbance wave will break down and stretch in the course of evolution but this phenomenon is not found in the low frequency disturbance cases. With a high Mach number, the most instable disturbance still has a large growth rate for the mixing with spanwise curvature and velocity. Therefore, it is an effective method for enhancing the mixing.

超音速混合层的流动不稳定性较之亚音速或不可压的混合层大大减弱,为了提高混合效率,通过数值模拟的方法分别研究了展向曲率、展向速度、来流马赫数等因素对混合效率所起的作用.计算结果表明:在给定展向速度的情况下,带有展向曲率的三维混合层,曲率越大三维扰动增长率越大,而且法向的卷起范围也越大.当展向曲率不为零时,展向速度的增大也能有效地增强混合能力.由流场中的高频扰动波产生的涡,在向下游发展过程中会有破碎、拉伸,低频扰动波没有发现这一现象.对于有展向曲率和展向速度的混合层,提高来流马赫数时,流场中最不稳定扰动的增长率仍很大.因此,这是一种提高混合层混合效率的新途径.

 
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