非対称型噴射管が圧縮性せん断層および渦構造に及ぼす影響

概要

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Effects of the asymmetric injectors on a compressible shear layer were investigated experimentally. The sine-, triangle- and square-waved splitter plates were used for the asymmetric injectors and the amplitude and wavelength of the splitter plates were varied. It was found that regardless of wave shapes, the growth rate increased by the asymmetric injectors. Increase in the amplitude led to increase in the growth rate and the maximum growth rate was gotten when the wavelength is equal to 11.5 or 15.3mm. The sine-wave gave maximum growth rate when other parameters were fixed. The vortex structures induced by asymmetric injectors were investigated by the numerical simulation. Although the complex vortex structures were induced in shear flow, the large-scale streamwise vortex structures, that is, the rib structures winding around the vortex cores were observed in the shear layer and caused time averaged streamwise vortex structure which increased growth rates. As a result, it was suggested that asymmetric injectors could induce the secondary instability of the double shear flow.
2009-07-05