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鹅颈型管道三维水流结构研究
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作者 董志勇 须清华 《水动力学研究与进展(A辑)》 CSCD 北大核心 2002年第1期25-31,共7页
本文通过试验量测了鹅颈型管道水流的三维流速分布 (不同层面和断面的纵向、垂向及横向流速分布 )与断面压力分布 ,剖析了鹅颈型管道的三维水流结构 ,揭示出鹅颈型管道边界分离的特点及二次流 (弯曲二次流及非圆形断面二次流 )的形成机... 本文通过试验量测了鹅颈型管道水流的三维流速分布 (不同层面和断面的纵向、垂向及横向流速分布 )与断面压力分布 ,剖析了鹅颈型管道的三维水流结构 ,揭示出鹅颈型管道边界分离的特点及二次流 (弯曲二次流及非圆形断面二次流 )的形成机理 ,提出了鹅颈型管道固有的水流型态 。 展开更多
关键词 鹅颈型管道 三维流速分布 三维边界层分离 二次流 三维水流结构 水力特性
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Topological evolution of laminar juncture flows under different critical parameters 被引量:1
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作者 YOUNIS Muhammad Yamin ZHANG Hua +1 位作者 HU Bo MEHMOOD Saqib 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第7期1342-1351,共10页
Horseshoe vortex topological structure has been studied extensively in the past,traditional"saddle of separation"and new"attachment saddle point"topologies found in literature both have theoretical... Horseshoe vortex topological structure has been studied extensively in the past,traditional"saddle of separation"and new"attachment saddle point"topologies found in literature both have theoretical basis and experimental and computational evidences for support.The laminar incompressible juncture flows at low Reynolds numbers especially are observed to have new topology.Studies concerning the existence of the new topology though found in literature,the topological evolution and its dependency on various critical flow parameters require further investigation.A Particle Image Velocimetry based analysis is carried out to observe the effect of aspect ratio,?*/D and shape of the obstacle on laminar horseshoe vortex topology for small obstacles.Rise in aspect ratio evolves the topology from the traditional to new for all the cases observed.The circular cross section obstacles are found more apt to having the new topology compared to square cross sections.It is noted that the sweeping effect of the fluid above the vortex system in which horseshoe vortex is immersed plays a critical role in this evolution.Topological evolution is observed not only in the most upstream singular point region of horseshoe vortex system but also in the corner region.The corner vortex topology evolves from the traditional type to new one before the topological evolution of the most upstream singular point,resulting in a new topological pattern of the laminar juncture flows"separation-attachment combination".The study may help extend the understanding of the three-dimensional boundary layer separation phenomenon. 展开更多
关键词 horseshoe vortex saddle of attachment saddle of separation topological evolution sweeping effect
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