Interaction of strong converging shock wave with SF6gas bubble

查看全文 作　　者：Yu [1]Liang;ZhiGang [1]Zhai;XiSheng [1]Luo

机构地区：[1]Department of Modern Mechanics, University of Science and Technology of China

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2018年第61卷第6期,共9页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.U1530103,and 11621202);Science Challenge Project(Grant No.TZ2016001) 摘　　要：Interaction of a strong converging shock wave with an SF6 gas bubble is studied, focusing on the effects of shock intensity and shock shape on interface evolution. Experimentally, the converging shock wave is generated by shock dynamics theory and the gas bubble is created by soap film technique. The post-shock flow field is captured by a schlieren photography combined with a high-speed video camera. Besides, a three-dimensional program is adopted to provide more details of flow field. After the strong converging shock wave impact, a wide and pronged outward jet, which differs from that in planar shock or weak converging shock condition, is derived from the downstream interface pole. This specific phenomenon is considered to be closely associated with shock intensity and shock curvature. Disturbed by the gas bubble, the converging shocks approaching the convergence center have polygonal shapes, and the relationship between shock intensity and shock radius verifies the applicability of polygonal converging shock theory. Subsequently, the motion of upstream point is discussed, and a modified nonlinear theory considering rarefaction wave and high amplitude effects is proposed. In addition, the effects of shock shape on interface morphology and interface scales are elucidated. These results indicate that the shape as well as shock strength plays an important role in interface evolution. 关键词：相互作用弱收敛冲击波 SF6 水泡煤气动力学理论技术创造

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Interaction of strong converging shock wave with SF6gas bubble

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