摘要
首先对比了天上飞行状态与地面风洞状态下钝锥边界层的转捩特性,然后利用基于线性稳定性理论的eN方法对飞行状态与风洞状态下的钝锥边界层进行了转捩预示,最后研究了壁温比对高速钝锥边界层的稳定性及转捩的影响。研究结果表明,在低壁温比条件下,圆锥迎风中心与侧面的边界层先于两者之间区域转捩,转捩形貌与飞行实验结果相似;在高壁温比条件下,圆锥迎风面区域迟于侧面及背风面区域转捩,转捩形貌与风洞试验结果相似。壁温比是造成高速钝锥边界层转捩天地差异的重要影响因素。
The transition characteristics of blunt cone boundary layers under the flight and ground conditions were firstly compared. Then the emethod based on the linear stability theory was used to predict the boundary layer transition of blunt cone in the cases of ground and flight tests. Finally the effects of ratio of wall temperature to total temperature on the stability and transition of boundary layer of high speed blunt cone were investigated. The results showed that the boundary layer transition on the centerline of windward face and the side face happened earlier than that between them under the condition of lower ratio of wall temperature to total temperature,and the transition morphology is similar to that in flight cases. However,the boundary layer transition on the windward face occurred later than that on the leeward face in higher ratio of wall temperature to total temperature,and the transition morphology is similar to that of in ground cases. The ratio of wall temperature to total temperature is an important factor which results in the discrepancy of boundary layer transition in flight and ground cases of high speed blunt cone.
作者
姚世勇
段毅
徐聪
李思怡
杨攀
段会申
YAO Shiyong;DUAN Yi;XU Cong;LI Siyi;YANG Pan;DUAN Huishen(Science and Technology on Space Physics Laboratory,Beijing 100076,China)
出处
《南京航空航天大学学报》
CAS
CSCD
北大核心
2022年第4期592-598,共7页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(U21B6003,12172058)。
关键词
钝锥
边界层
转捩
壁温比
blunt cone
boundary layer
transition
ratio of wall temperature to total temperature
