高速混合层声发射非线性传播的计算
Computations of Nonlinear Propagation of Sound Emitted from High Speed Mixing Layers
摘要：
采用大涡模拟（LES）方法模拟可压缩时间发展混合层，并求解粘性Burgers方程，对非线性声传播进行了计算研究。混合层的对流马赫数为0.4、0.8和1.2。LES的结果同意定性与已知的流动行为。用大涡模拟方法计算了超声速混合层的近声场，观察到了马赫波。这些波表现出典型的非线性传播的陡化。使用Burgers方程的进一步计算支持这一发现，其中初始波斜率在踢它们中起作用。亚音速混合层没有发现明显的非线性传播效应。几何扩散和粘性的影响也被认为是。
英文摘要：
Non-linear sound propagation is investigated computationally by simulating compressible time-developing mixing layers using the Large Eddy Simulation (LES) approach and solving the viscous Burgers Equation. The mixing layers are of convective Mach numbers of 0.4, 0.8 and 1.2. The LES results agree qualitatively with known flow behavior. Mach waves are observed in the near sound field of the supersonic mixing layer computed by the LES. These waves show steepening typical to non-linear propagation. Further calculations using the Burgers equation support this finding, where the initial wave slope has a role in kicking them. No visible non-linear propagation effects were found for the subsonic mixing layers. The effects of geometrical spreading and viscosity are also considered.
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