Interactions among baroclinically-generated vortex rings in building up an acting spike to a bow shock layer
Interactions among baroclinically-generated vortex rings in building up an acting spike to a bow shock layer
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DOI：
10.1063/1.3534002
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发表时间：
2011-02
影响因子：
4.6
通讯作者：
Jae‐Hyung Kim;A. Matsuda;A. Sasoh
中科院分区：
文献类型：
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作者：
Jae‐Hyung Kim;A. Matsuda;A. Sasoh
通过在马赫数为1.94的20 mm直径平头圆柱体上的弓形激波之前沉积激光脉冲能量，重复地产生具有恒定环量的涡环。每个涡环都是激光加热气体与弓形激波斜压相互作用后形成的。随着脉冲重复频率f0的增加，涡环之间的相互作用变得更强，出现了f0=10-20 kHz的交替俯仰运动和f0=30 kHz的“穿流”运动。在此基础上，建立了一个准稳态作用尖峰，它降低了滞止压力。
Vortex rings with a constant circulation are repetitively generated by depositing laser pulse energies ahead of a bow shock wave over a 20-mm diameter, flat-head cylinder in Mach 1.94 flow. Each vortex ring is formed after baroclinic interaction between a laser-heated gas and the bow shock wave. With increasing the pulse repetition frequency, f0, mutual interactions among the vortex rings become stronger; alternate pitching motions at f0=10–20 kHz and “slip-through” motions at f0=30 kHz appear. Beyond that, a quasisteady-state acting spike which decreases the stagnation pressure is built up.