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摘要
Heterogeneous shear layers, characterized by the presence of a wake deficit and a Gaussian temperature profile, me considered. Unstable mode characteristics are interpreted in terms of a Eve-parameter set which describes the velocity ratio and the thicknesses and strengths of the wake component and temperature spike. In the absence of a wake deficit, the Kelvin-Helmholtz mode is inhibited as density gradients increase. Stabilization of this mode is weak (strong) when the density profile thickness is larger (smaller) than that of the shear layer When a wake component is present, stabilization of the Kelvin-Helmholtz instability is no longer observed, In this case, the growth rate of unstable Kelvin-Helmholtz waves is found to be weakly sensitive to the presence of a heated region and to the details of the wake deficit.
- 出版日期1995-5
