摘要
采用Fluent软件对激波诱导单双圆柱模型绕流场进行二维数值计算,深入研究马赫数为1.14的激波与直径为40mm的单、双圆柱模型相互作用时绕柱流场的非稳态曳力的形成机理。结果表明:单、双柱模型(H=1.5)的曳力系数Cd曲线都存在明显的波峰和多个波谷结构,并以波幅不断减小的方式逐渐趋于某个稳定正值,其中波峰峰值远大于稳态值;相比于单柱情形,由于双柱空间位置的限制,使得环绕每柱的激波结构可以发生相互干涉,从而影响了环绕圆柱的压力以及剪切应力分布,导致单双柱曳力系数曲线波动变化的差异。
Two-dimensional numerical calculation of ambient flow field of single/double cylindrical models induced by the shock wave was conducted with Fluent software. Formation mechanism of unsteady drag force of ambient flow field was deeply studied during interactions between shock waves with Ms = 1.14 and single/double cylindrical models with the diameter of 40 mm. The results show that drag force coefficient Ca of single/double cylindrical models （H=1. 5） has significant wave crest and multiple troughs and gradually tends to a steady positive value in the form of decreasing amplitude. The wave peak value is much greater than the steady-state value. Compared with single cylinder, due to space position limit of dual cylinders, shock wave structure surrounding each cylinder may mutually interfere, which thus influences distribution of cylindrical pressure and shear stress and leads to differences of fluctuation changes of single/double cylindrical drag force coefficient curve.
出处
《浙江理工大学学报（自然科学版）》
2015年第1期55-61,共7页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(51006091)
浙江省自然科学基金项目(LY13E060011)
流体机械及工程省重点学科及流体工程技术创新团队项目(11130031201301)
流动腐蚀与防控技术创新团队(浙理工科〔2013〕13号)
关键词
激波
单/双柱
非稳态曳力
曳力系数
相互干涉
shock wave
single/double cylinder
unsteady drag force
drag coefficient
interference
