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首页> 外文期刊>Journal of aerospace engineering >Control of Elliptic Supersonic Jet of Aspect Ratio 3
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Control of Elliptic Supersonic Jet of Aspect Ratio 3

机译：纵横比为3的椭圆超声速射流的控制

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摘要

Control of a Mach 2 elliptic jet from a convergent-divergent elliptic nozzle of Aspect Ratio 3, with rectangular and triangular tabs of identical blockage, was studied experimentally at different levels of pressure gradient at the nozzle exit. At all levels of pressure gradient studied in this work, irrespective of tab geometry, the tabs along the minor axis promoted mixing and the tabs along the major axis retarded mixing. However, the level of mixing was sensitive to the tab geometry. The triangular tabs along the minor axis caused greater mixing than the rectangular tabs at all pressure gradients. The triangular tabs along the minor axis caused a maximum core length reduction of 77% at a Nozzle Pressure Ratio (NPR) 4 and a minimum of 64% at NPR 5. The maximum and minimum core length reductions caused by the rectangular tabs along the minor axis were 39%, at NPR 6 and 20%, at NPRs 5 and 8. Shadowgraphs of the jet show that the waves in the core were rendered weak by both rectangular and triangular tabs when placed along the minor axis. (C) 2017 American Society of Civil Engineers.
机译：实验研究了长宽比为3的发散-发散椭圆形喷嘴的Mach 2椭圆形射流的控制，该矩形矩形和三角形凸耳具有相同的堵塞，在喷嘴出口的不同压力梯度水平上进行了实验研究。在这项工作中研究的所有压力梯度水平上，无论凸耳的几何形状如何，沿短轴的凸耳都会促进混合，而沿长轴的凸耳会阻碍混合。但是，混合程度对接片的几何形状很敏感。在所有压力梯度下，沿着短轴的三角形凸耳比矩形凸耳产生更大的混合。沿短轴的三角形接片在喷嘴压力比（NPR）4时导致最大芯长度减少77％，在NPR 5时引起最小64％。沿着短轴的矩形接片导致最大和最小芯长度减少轴在NPR 6和NPR 5和8分别为39％和20％。射流的阴影图显示，当沿短轴放置时，矩形和三角形凸片使芯中的波变弱。 （C）2017年美国土木工程师学会。

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