Erdem Erinc, Kontis Konstantinos, Saravanan Selvaraj
Aerospace Sciences Division, School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK.
Department of Aerospace Eng'rg, Indian Institute of Science, Bangalore 560012, India.
Sensors (Basel). 2014 Dec 8;14(12):23462-23489. doi: 10.3390/s141223462.
An experimental investigation of sonic air, CO 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 CO jet resulted similar nearfield and farfield penetration pattern whereas Helium jet spread minimal in the nearfield.
在平板上对马赫数为5的横流中声速空气、一氧化碳和氦气横向射流进行了实验研究。所有气体的射流与自由流动量通量比J保持相同。使用高速纹影可视化和粒子图像测速技术（PIV）研究了非定常流动拓扑结构。纹影可视化提供了有关振荡射流剪切层结构以及弓形激波、马赫盘和桶形激波的信息。在中心线处进行的二维粒子图像测速测量提供了有关射流穿透轨迹的信息。还对形成射流边界的桶形激波和马赫盘进行了可视化/量化，并确定了射流穿透边界。尽管所有气体的J保持相同，但发现在近场和远场中穿透模式都有显著差异。空气和一氧化碳射流在近场和远场中的穿透模式相似，而氦气射流在近场中的扩散最小。
