The study of determinacy of asymmetric vortices over slender body at post-critical Reynolds numbers

摘要：

An artificial transition technique of setting transition wires on both side of a pointed-ogivecylinder with the nose fineness ratio 3.0 was used to simulate the post-critical Reynolds numbers owat high incidence in low-speed wind tunnel. The results based on this artificial transition technicalindicate that the indeterminacy of asymmetric vortices aroused by nose-tip imperfection resultedfrom machining tolerance still exists in post-critical Reynolds numbers ow. The indeterminacyof asymmetric vortices can be eliminated by adding the micro-triangle block artificial perturbationwith thickness of 0.2mm to the nose-tip, and the artificial perturbation on nose-tip can promote theasymmetric vortices into bistable state at _=50_. When the results of artificial perturbations withvarious thicknesses are combined, it is indicated that the intensity of artificial perturbation must beconsidered when it was just used to eliminate the indeterminacy of asymmetric vortices.

关键词： high angle of attack slender body asymmetric vortices post-critical Reynolds numbers

作者: W.Tian X.Y.Deng B.Wu Y.K.Wang

作者单位: Ministry-of-Education Key Laboratory of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

会议类型: 国际会议

会议名称: The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)

会议地点: 上海

会议语种:英文

在线出版日期: 2007-08-15（万方平台首次上网日期，不代表论文的发表时间）