Laser energy deposition effectiveness on shock-wave boundary-layer interactions over cylinder-flare combinations
Laser energy deposition effectiveness on shock-wave boundary-layer interactions over cylinder-flare combinations
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DOI：
10.1063/1.4896288
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发表时间：
2014-09
影响因子：
4.6
通讯作者：
Takeshi Osuka;E. Erdem;N. Hasegawa;R. Majima;T. Tamba;Shigeru Yokota;A. Sasoh;K. Kontis
中科院分区：
文献类型：
--
作者：
Takeshi Osuka;E. Erdem;N. Hasegawa;R. Majima;T. Tamba;Shigeru Yokota;A. Sasoh;K. Kontis
实验研究了重复激光脉冲能量沉积（5.5 mJ/脉冲）对马赫数为1.92的圆柱-耀斑模型激波-边界层相互作用区域的影响。根据机头形状和耀斑角度的不同，流型被细分为两种；在分离流动中，出现了滑移线和源自鼻筒交界处的强分离激波；在非分离流动中，没有观察到滑移线，重新附着的激波要弱得多。在耀斑角约为30°时，即使激光能量沉积低至5 kHz，也可以抑制分离。纹影显示的流动模式与阻力特性有很好的相关性，在没有分离的情况下获得较大的阻力。分离控制的一种可能情况是斜压涡环引入的扰动诱导边界层过渡，使其对逆压梯度变得鲁棒。在边际条件下，在相同的操作条件下可得到双模流型，即部分抑制和完全抑制。
The effects of repetitive laser-pulse energy depositions (5.5 mJ/pulse) onto a shock wave-boundary layer interaction region over cylinder-flare model in a Mach 1.92 flow are experimentally investigated. Depending on the nose shape and the flare angle, the flow patterns are subdivided to two; separated flow in which a slip line and a strong separation shock wave originated in the nose-cylinder junction appears, and a non-separated flow in which a slip line is not observed and the re-attachment shock wave is much weaker. At flare angles around 30°, the separation can be suppressed by laser energy deposition even of down to 5 kHz. The Schlieren-visualized flow patterns are well correlated to the drag characteristics, in which a larger drag is obtained without separation. A possible scenario of the separation control is that the disturbance introduced by the baroclinic vortex ring induced the boundary layer transition so that it became robust against the adverse pressure gradient. Under marginal conditions, dual mode flow patterns, that is, a partial and full suppression modes are obtained under the same operation conditions.