超音速混合促進のための圧縮性混合層の制御について(<小特集>乱流せん断流の制御)

概要

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The objective of the present study is to develop supersonic mixing enhancement techniques for future scramjet engines. Achievement of the necessary mixing enhancement by means of turbulence control is a challenge because compressibility can strongly hinder turbulent motions at supersonic speeds. Here, we propose the manipulation of mixing layers into multiple shear regions in order to alleviate the compressibility effect. To examine this proposal, the stability of compressible mixing layers with combined-hyperbolic-tangent velocity profile is investigated through an inviscid spatial stability analysis. The combined velocity profile has two shear layers: one being in the faster stream and the other in the slower stream. The former is called shear 1 and the latter shear 2. Amplified disturbances are found for each of shear 1 and shear 2. For these disturbances the eigenfunctions and contour plots of the pressure and vorticity disturbances are demonstrated together with their growth characteristics. These results indicate a high possibility that the supersonic mixing can be strongly enhanced by the proposed manipulation. Effects of the convective Mach number on the normalized maximum growth rates are also clarified for the combined-hyperbolic-tangent profile.
社団法人日本機械学会の論文
1997-01-25