其他null检测 | 5马赫跨音速喷嘴在空气，二氧化碳和氦气交叉流中的穿越特性-北京欧兰科技发展有限公司

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采用LaVision公司最短帧间时间间隔可达115纳秒的跨帧相机，可以测量的速度上线可达十几公里/秒。本文的测试速度就达到了5倍音速。

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An experimental investigation of sonic air, CO2 and Helium transverse jets in

Mach 5 cross flow was carried out over a flat plate. The jet to freestream momentum flux

ratio, J, was kept the same for all gases. The unsteady flow topology was examined using

high speed schlieren visualisation and PIV. Schlieren visualisation provided information

regarding oscillating jet shear layer structures and bow shock, Mach disc and barrel shocks.

Two-component PIV measurements at the centreline, provided information regarding jet

penetration trajectories. Barrel shocks and Mach disc forming the jet boundary were

visualised/quantified also jet penetration boundaries were determined. Even though J is

kept the same for all gases, the penetration patterns were found to be remarkably different

both at the nearfield and the farfield. Air and CO2 jet resulted similar nearfield and farfield

penetration pattern whereas Helium jet spread minimal in the nearfield.

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北京欧兰科技发展有限公司

金牌会员丨第17年

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