摘要
为了研究不同形状粗糙元诱导边界层转捩机理的差异,采用五阶精度加权紧致非线性格式数值模拟了Ma=4. 20条件下方柱形、圆柱形、钻石形和半球形粗糙元引起的超声速平板边界层转捩问题。结果表明:方柱形粗糙元产生的分离区长度较大,分离区中存在较强的非定常扰动并产生绝对不稳定机制使边界层很早就发生转捩;钻石形粗糙元分离区的展向宽度较宽,导致分离区中的涡结构向下游发展时形成的湍流尾迹区较宽;而圆柱形和半球形粗糙元诱导边界层转捩的能力相对较弱。
In order to investigate the differences of the transition mechanisms between four roughness shapes,a fifth-order WCNS scheme was used to simulate the supersonic flat-plate boundary layer transition induced by the square,cylinder,diamond and hemisphere roughness elements at Mach 4. 20. Results show that the square roughness element has the longest separated region where the absolute instability is formed,thus resulting in the earliest transition. The diamond roughness element has the widest separated region and leads to the widest turbulent wake region. The cylinder and hemisphere roughness elements are less effective in inducing transition compared with the square and diamond roughness elements.
作者
周云龙
刘伟
吴栋
ZHOU Yunlong;LIU Wei;WU Dong(College of Aeronautics and Astronautics,National University of Defense Technology,Changsha 410073,China;The PLA Unit 61267,Beijing 101149,China)
出处
《国防科技大学学报》
EI
CAS
CSCD
北大核心
2018年第6期17-22,共6页
Journal of National University of Defense Technology
基金
国家自然科学基金资助项目(11502292)
国防科技大学重大应用基础研究资助项目(ZDYYJCYJ 20140101)
国防科工局国防基础科研计划资助项目(C1520110002)
关键词
超声速
边界层转捩
粗糙元形状
数值模拟
supersonic
boundary layer transition
roughness shape
numerical simulation
