角区三维分离流附着鞍点拓扑结构及其演化

张华; 胡波; Muhammad Yamin Younis; 王宏

角区三维分离流附着鞍点拓扑结构及其演化

北京航空航天大学航空科学与工程学院, 北京 100191

基金项目: 国家自然科学基金资助项目(10872022)

详细信息

中图分类号: V211.3
计量
- 文章访问数: 2687
- HTML全文浏览量: 254
- PDF下载量: 792
- 被引次数: 0
出版历程
- 收稿日期: 2011-06-26
- 网络出版日期: 2012-07-30

Attachment saddle point topology and transformation of 3-D separation in juncture flow

School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 实验研究角区层流边界层三维定常分离附着鞍点拓扑结构的存在性及其演化规律.二维粒子图像测速(PIV,Particle Image Velocimetry)激光片光源设置于给定平板和不同模型组成的角区对称面,采用微距镜头捕捉对称面奇点附近的局部流动拓扑结构.实验证实在一定流动参数条件下多种形状模型与平板形成的角区均存在有别于经典分离的附着鞍点拓扑结构;随着雷诺数增加或者随着模型钝度的变化,附着鞍点拓扑结构与经典分离鞍点拓扑结构之间存在着一定的演化规律;对附着鞍点拓扑结构与Lighthill经典三维分离模式的关系进行了分析,表明Lighthill经典三维分离模式也适用于分析附着鞍点拓扑结构.
- 边界层流动 /
- 分离 /
- 旋涡流动 /
- 附着鞍点 /
- 粒子图像测速
Abstract: An experimental investigation of laminar boundary layer 3-D steady separation vortex flow upstream of junctures had been conducted to verify the existence of attachment saddle point topology and to study the transformation of the flow topology. The laser light sheet of 2-D particle image velocimetry(PIV) system was set on the symmetry plane of junctures formed by different shape models mounted on a fixed length flat plate. A micro lens was used to take the local flow topology around the singular point. The results confirmed the existence of attachment saddle point structure under certain flow parameters in different shape of junctures. There is transformation between attachment saddle point topology and classical separation saddle point topology as Reynolds number increase or model bluntness changes. An analysis of relation between attachment saddle point topology and Lighthill-s classical steady 3-D separation mode is presented to show that Lighthill-s classical separation mode is applicable for attachment saddle point topology.
- boundary layer flow /
- separation /
- vortex flow /
- attachment saddle point /
- particle image velocimetry(PIV)

HTML全文

参考文献(17)

[1]	Simpson R L.Junction flows[J].Annual Review of Fluid Mechanics,2001,33(1):415-443
[2]	Khan M J,Ahmed A.Topological model of flow regimes in the plane of symmetry of a surface-mounted obstacle[J].Physics of Fluids,2005,17(4):045101-045101-8
[3]	Khan M J.Dynamics of the junction vortex.AIAA Journal,1995,33(7):113-122
[4]	Seal C V,Smith C R,Rockwell D.Dynamics of the vorticity distribution in endwall junctions[J].AIAA Journal,1997,35(6):1041-1047
[5]	Zhang Hua,Lü Zhiyong.The vortex structure in swept wing/body interactions //Proceedings of the 6th Asian Symposium on Visualization.Pusan:,2001:434-436
[6]	Maskell E C.Flow separation in three dimension.RAE Aero Rept 2565,1955
[7]	Lighthill M J.laminar boundary layers.Oxford University Press,1963:5-88
[8]	Wang K C.Separation patterns of boundary layer over an inclined body of revolution.AIAA Journal,1972,10(8):1044-1050
[9]	Wang K C.Separation of three-dimensional flow[J].MML,1976,18(8):76-54
[10]	Visbal M R.Structure of laminar juncture flows.AIAA Journal,1991,29(8):1273-1282
[11]	Chen C L,Hung C M.Numerical study of juncture flows.AIAA Journal,1992,29(18):7-30
[12]	Hung C M,Sung C H,Chen C L.Computation of saddle point of attachment[J].AIAA Journal,1992,30(6):6-30
[13]	Coon M D,Tobak M.Experimental study of saddle point of attachment in laminar junction flow.AIAA Journal,1995,33(12):88-92
[14]	张华,吕志咏.应用PIV研究角区三维分离的附着奇点结构.空气动力学学报,2007,25(增刊):37-42 Zhang Hua,Lü Zhiyong.The investigation of saddle point of 3-D separation in juncture flow by PIV[J].Acta Aerodynamis Sinica,2007,25(Supplement):37-42(in Chinese)
[15]	Perry A E,Fairlie B W.Critical points in flow patterns[J].Advances in Geophysics,1974,18(B):299-315
[16]	张涵信.分离流与漩涡运动的结构与分析.北京:国防工业出版社,2005:5-67 Zhang Hanxin.Structure analysis of separated flows and vortex motion[M].Beijing:National Defense Industry Press,2005:5-67(in Chinese)
[17]	Tobak M,Peake D J.Topology of three-dimensional and three-dimensional separated flows.NASA-TM-81294,1981