【作者】 任利； 周建华；

【Author】 REN Li;ZHOU Jianhua;School of energy and power engineering,Beihang University;

【机构】 北京航空航天大学能源与动力工程学院；

【摘要】 本文采用大涡模拟(WMLES)方法来研究三维激波边界层干扰(SWBLI)的流动现象。首先对来流Mach数为3.0,压缩折角为25°的计算模型进行了验证,计算结果与Zheltovodov等人的实验数据进行对比,结果显示壁面压力分布、摩擦系数都与实验吻合很好。为了降低计算的时间成本,主要对来流Mach数为2.0,压缩折角为20°的模型进行了计算,在壁面流向和展向监控了39个点,对壁面监控点压力脉动进行频谱分析,发现壁面压力脉动在同区域流向高度相关,壁面各点压力脉动主频相同。更多还原

【Abstract】 In this paper,wall modeled large eddy simulation(WMLES) is used to investigate the flow physics of a three dimensional shock turbulent boundary layer interaction,on a compression expansion ramp with the angle of 20° and 25°.The results of 25° ramp are compared with the experimental data of Zheltovodov et al.,in the same condition,as those used by them.Results show that there are a good agreement with experimental trends concerning friction coefficient and wall pressure distribution.WMLES,used in this study,presents more accurate results with fewer computational costs.Afterwards,we investigated the pressure pulsating on wall.Our simulations show that the main frequency of wall pressure pulsating is a certain value.更多还原