Stabilization of a hypersonic boundary layer using an ultrasonically absorptive coating
Stabilization of a hypersonic boundary layer using an ultrasonically absorptive coating
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DOI：
10.1017/s0022112002003440
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发表时间：
2003-03
影响因子：
3.7
通讯作者：
A. Fedorov;A. Shiplyuk;A. Maslov;E. Burov;N. Malmuth
中科院分区：
文献类型：
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作者：
A. Fedorov;A. Shiplyuk;A. Maslov;E. Burov;N. Malmuth
本文介绍了超声吸收涂层（UAC）对高超音速边界层稳定性影响的实验和理论研究。选择纤维吸收材料（毡金属）的薄涂层作为实用UAC的原型。实验在马赫数6的风洞中进行，实验对象是一个纵向半面为实心、另一半面为多孔涂层的7 ^{\circ}$的半角尖锥。在固体和多孔表面上进行了“自然”扰动和人工激发波包的热线测量。二维和三维扰动的UAC效应的稳定性分析表明，多孔涂层强烈稳定的第二模式和轻微不稳定的第一模式。这些结果与自然扰动的实验数据定性一致。理论预测与第二模式相关的人工激发波包的稳定性测量结果吻合良好。冷却壁情况下的稳定性计算表明，使用随机微观结构的薄多孔涂层实现层流运行的显着增加的可行性。
Experimental and theoretical studies of the effect of an ultrasonically absorptive coating (UAC) on hypersonic boundary-layer stability are described. A thin coating of fibrous absorbent material (felt metal) was selected as a prototype of a practical UAC. Experiments were performed in the Mach 6 wind tunnel on a $7^{\circ}$ half-angle sharp cone whose longitudinal half-surface was solid and other half-surface was covered by a porous coating. Hot-wire measurements of ‘natural’ disturbances and artificially excited wave packets were conducted on both solid and porous surfaces. Stability analysis of the UAC effect on two- and three-dimensional disturbances showed that the porous coating strongly stabilizes the second mode and marginally destabilizes the first mode. These results are in qualitative agreement with the experimental data for natural disturbances. The theoretical predictions are in good quantitative agreement with the stability measurements for artificially excited wave packets associated with the second mode. Stability calculations for the cooled wall case showed the feasibility of achieving a dramatic increase of the laminar run using a thin porous coating of random microstructure.