Asymptotic growth of disturbances from spatially compact source in a skewed mixing layer
摘要：
The growth of disturbances in a skewed mixing layer, i.e., the shear layer between two streams with different velocity magnitudes and directions, is examined. Due to the three-dimensionality of the mean flow, the natural amplification direction for spatially amplifying waves needs to be determined. This issue can be resolved through investigation of the asymptotic growth of disturbances from a spatially compact source. The results show that the disturbances grow in a wedge-shaped region centered at the mean convection direction for both incompressible and compressible mixing layers. For incompressible unskewed mixing layers, the normal to the instability wave fronts is parallel to the amplification direction. The wave front normal is oblique to the amplification direction for skewed mixing layers and/or mixing layers with moderate compressibility.
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DOI：
10.1063/1.869985
被引量：
年份：
1999
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