PIV INVESTIGATION OF SPANWISE VARIATION IN INCIDENT SHOCK BOUNDARY LAYER INTERACTIONS

Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena Pub Date : 1900-01-01 DOI:10.1615/tsfp8.540

L. Campo, D. Helmer, J. Eaton

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引用次数: 2

Abstract

Two incident shock boundary layer interactions (SBLIs) were documented using high resolution 2D particle image velocimetry (PIV). The incident shock wave for each interaction was generated using a sub-boundary layer fully spanning 20◦ compression wedge on the top wall of the test section. A relatively weak SBLI occurred when the incident shock was generated using a 1.1mm (0.20δ0) high wedge, and a stronger interaction occurred when the incident shock was generated using a 3.0mm (0.55δ0) high wedge. For each SBLI, velocity and turbulence measurements were obtained in four planes across the span of a low aspect ratio test section – one near the center of the tunnel, and three inside the side wall boundary layer. The measurements indicated strong three-dimensionality in both interactions, with the interaction strength decreasing significantly near the side walls. Both interactions show regions of intermittent flow reversal, with the maximum value approximately tripled for the interaction generated by the larger wedge. Mean flow reversal was observed near the centerplane of the stronger SBLI, but not for the weaker SBL

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入射激波边界层相互作用展向变化的Piv研究

利用高分辨率二维粒子图像测速技术(PIV)记录了两个入射激波边界层相互作用(sbli)。每次相互作用的入射激波都是在测试段的顶壁上使用一个完全跨越20◦压缩楔的亚边界层产生的。使用1.1mm (0.20δ0)高楔产生入射激波时，产生了相对较弱的SBLI;使用3.0mm (0.55δ0)高楔产生入射激波时，产生了较强的相互作用。对于每个SBLI，在低展宽比测试断面跨跨的四个平面上进行了速度和湍流测量-一个靠近隧道中心，三个在侧壁边界层内。测量结果表明，两种相互作用具有很强的三维性，相互作用强度在侧壁附近显著降低。两种相互作用均出现间歇流动逆转区域，较大楔形产生的相互作用的最大值约为三倍。在SBLI较强的中心平面附近观察到平均流动反转，而在SBLI较弱的中心平面附近则没有

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Proceeding of Eighth International Symposium on Turbulence and Shear Flow Phenomena

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