Marginally separated flows in dilute and dense gases
Marginally separated flows in dilute and dense gases
复制标题
稀气体和浓气体中的边缘分离流
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
A. Kluwick
中科院分区：
文献类型：
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作者：
A. Kluwick
本文集中讨论了二维几乎分离边界层受三维表面安装障碍物干扰时的流动效应。除了满足理想气体定律的稀气体外，稠密气体也被考虑。它们的显著特点是基本气体动力学导数Γ可以改变符号。结果，可能形成稀薄激波，在稀薄气体的情况下，热力学第二定律排除了这种激波。然而，在本文中更重要的是，发现在各向同性压缩过程中与不寻常的Γ-行为相关的非单调马赫数变化代表了形成边缘分离流的一种新的非经典机制。
The paper concentrates on flow effects which occur if a two–dimensional almost separated boundary layer is disturbed by a three–dimensional surface–mounted obstacle. In addition to dilute gases which satisfy the perfect gas law, dense gases are also considered. These have the distinguishing feature that the fundamental gasdynamic derivative Γ can change sign. As a result, rarefaction shocks may form which, in the case of dilute gases, are ruled out by the second law of thermodynamics. More important in the present context, however, it is found that the non–monotonous Mach number variation during isotropic compression associated with the unusual Γ–behaviour represents a new non–classical mechanism for the formation of marginally separated flows.