摘要
空腔流动中包含着丰富的涡结构相关物理现象,开展空腔流动中的涡动力学分析能够为相应的流动控制和降噪提供理论依据。采用直接数值模拟获得开式空腔流动的高精度流场数据,用拉格朗日拟序结构识别流场中的涡结构,并结合Q判据和涡量通量分析,对空腔中涡的生成、脱落、对流以及撞击破裂过程展开研究,分析其动力学特性。结果表明:在一个流动周期内,拉格朗日拟序结构的卷起与脱离伴随着前缘涡的生成与脱落,向下游发展;拉格朗日拟序结构在后缘点的破裂伴随着Q与涡的破裂;空腔内部的主涡则在整个流动周期内都维持相对稳定状态。
The open cavity flow contains various physical phenomena relating to vortex structures.The study on the vortex dynamics in the open cavity can provide theoretical insights into flow control and noise reduction.Direct numerical simulation is performed to obtain high order accuracy flow field of the open cavity.The vortex structures are identified using the Lagrangian coherent structures.Together with the Q-criterion and vorticity flux analysis,the formation,convection,impingement and split of the vortex in the cavity is studied and the dynamical characteristics are revealed.Results show that in a flow cycle,the rolling up and shedding of Lagrangian coherent structures at the leading edge corresponds to the formation and shedding of the vortex developed downstream;and at the trailing edge the split of Lagrangian coherent structures corresponds to the split of Q and Vortex.The main vortex in the cavity remains stable during the whole period of the flow.
作者
韩帅斌
罗勇
张树海
Han Shuaibin;Luo Yong;Zhang Shuhai(State Key Laboratory of Aerodynamics,China Aerodynamics Research and Development Center,Mianyang 621000,China;Computational Aerodynamics Institute,China Aerodynamics Research and Development Center,Mianyang 621000,China)
出处
《航空工程进展》
CSCD
2019年第5期691-697,734,共8页
Advances in Aeronautical Science and Engineering
基金
国家自然科学基金(11732016)
关键词
空腔流动
直接数值模拟
涡动力学
拉格朗日拟序结构
open cavity flow
direct numerical simulation
vortex dynamics
Lagrangian coherent structures
