曲率を持つ圧縮性せん断層の不安定性

概要

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Instability of a curved compressible shear layer was investigated by the use of linear stability analysis. If velocity of flow along a convex wall is larger than that of flow along a concave wall, flow field is unstable to purely spanwise disturbances and streamwise vortices are formed. Effects of parameters such as convective Mach number, velocity ratio and density ratio on growth rates were investigated. There are negligible effects of compressibility on growth rates of these disturbances, which indicates relatively effective mixing enhancement for flow fields where effects of compressibility is large. Study on viscous fluid showed that growth rates of spanwise disturbances with large wavenumber decrease in comparison to the case of inviscid fluid. As a result, a certain spanwise wavelength having maximum growth rates exists and control of wavelength can contribute to mixing enhancement.
社団法人日本航空宇宙学会の論文
2004-03-05