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展向曲率
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  spanwise curvature
     A STUDY ON DISTURBANCES EVOLUTION IN SUPERSONIC MIXING LAYER WITH SPANWISE CURVATURE
     带展向曲率的超音速混合层中扰动演化的研究
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  相似匹配句对
     A STUDY ON DISTURBANCES EVOLUTION IN SUPERSONIC MIXING LAYER WITH SPANWISE CURVATURE
     带曲率的超音速混合层中扰动演化的研究
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     ISOTROPIC SUBMANIFOLD IN THE SPACE WITH CONSTANT CURVATURE
     常曲率空间的迷子流形
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     PV premiere Vision coming to China
     带着期待中国走来
短句来源
     Isotropic Immersions in the Space with Constant Curvature
     常曲率空间中的迷浸入
短句来源
     O-H topology was chosen for the grid generation in chord-wise and spanwise directions.
     选择O—H型式生成弦网格。
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A useful method of enhancing the mixing for supersonic mixing layer is improving flow dynamics instability.In this paper,the three-dimensional (3-D) compressible mixing layers with spanwise curvature was discussion.According to analyses of flow dynamics stability,the three dimensional disturbances have lager rate of amplification,have better ability of blending in normal direction of mixing layer and can enhance the mixing for 3-D compressible mixing layer in this compressible mixing layers.This characteristic...

A useful method of enhancing the mixing for supersonic mixing layer is improving flow dynamics instability.In this paper,the three-dimensional (3-D) compressible mixing layers with spanwise curvature was discussion.According to analyses of flow dynamics stability,the three dimensional disturbances have lager rate of amplification,have better ability of blending in normal direction of mixing layer and can enhance the mixing for 3-D compressible mixing layer in this compressible mixing layers.This characteristic is also for supersonic and hypersonic mixing layer,which is useful method of enhancing the mixing for supersonic and hypersonic mixing layer.

利用流动稳定性提高超音速混合层的混合效率,对于提高超音速流的高效混合是一个有效途径。研究结果表明,有展向曲率的三维混合层中,三维扰动的增长率很大,且法向的掺混能力也较强,可以有效地增强混合。对于高马赫数来流的超音速混合层,这一特性依然存在,这将有利于提高高超音速混合层的混合能力。

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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