北京航空航天大学学报 ›› 2010, Vol. 36 ›› Issue (12): 1461-1464,1479.

• 论文 • 上一篇    下一篇

角区三维漩涡流动的新分离结构

王雪娥, 张华, 王宏, 付立群   

  1. 北京航空航天大学 航空科学与工程学院, 北京 100191
  • 收稿日期:2009-10-17 出版日期:2010-12-30 发布日期:2010-12-30
  • 作者简介:王雪娥(1985-),女,山西吕梁人,硕士生,buaaxueer@126.com.
  • 基金资助:

    国家自然基金资助项目(10872022)

New 3-D separation structure in juncture flows

Wang Xuee, Zhang Hua, Wang Hong, Fu Liqun   

  1. School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China
  • Received:2009-10-17 Online:2010-12-30 Published:2010-12-30

摘要: 分别用数值计算和PIV(Particle Image Velocimetry)实验方法研究角区层流边界层三维定常分离的流动结构,证实了角区确实存在有别于传统分离现象的附着鞍点结构,对称面上游的流线并非从壁面向上抬起从壁面分离,而是经由空间某个奇点向壁面附着.角区马蹄涡的传统分离鞍点结构和附着鞍点结构之间存在着一定的演化规律,影响参数包括模型头部钝度、边界层厚度和雷诺数.一定的边界层和雷诺数条件下随着模型头部钝度减小,角区马蹄涡将从传统的分离鞍点结构逐步过渡为附着鞍点结构;对一定的模型若雷诺数越大、边界层越厚则角区流动越趋向于传统的分离鞍点结构,反之则倾向于附着鞍点结构.

Abstract: A computational and particle image velocimetry(PIV) experimental study of three dimensional steady separation structure generated in juncture laminar flows was presented. It confirms the existence of outmost attachment saddle point structure of horseshoe vortex in juncture flows. The outmost streamline doesn’t rise from the plate but attaches to the plate by passing through a space singular point. There also exists an evolvement rule of horseshoe vortex structure from outmost attachment saddle point structure to outmost separation saddle point structure. The evolvement is influenced by the blunt extent of the model, the boundary layer thickness and the Reynolds number. Under curtain boundary layer and the Reynolds number conditions, the horseshoe vortex will change from outmost separation saddle point structure to outmost attachment saddle point structure as the blunt extent of the model becomes smaller. For a same model, the horseshoe vortex will tend to be outmost separation saddle point structure as the boundary layer thickness and the Reynolds number increases, contrarily it will tend to be outmost separation saddle point structure.

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