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Applied Mathematics and Mechanics (English Edition) ›› 2002, Vol. 23 ›› Issue (8): 948-957.

• 论文 • 上一篇    下一篇

TOPOLOGY AND VORTEX STRUCTURES OF A CURVING TURBINE CASCADE WITH TIP CLEARANCE (Ⅰ)- EXPERIMENTAL MODEL AND TOPOLOGICAL FLOW PATTERNS ON BOTH ENDWALLS AND BLADE SURFACES

杨庆海, 黄洪雁, 韩万今   

  1. Academy of Energy Science and Engineering, Harbin Institute of Technology, P. O. Box 458, Harbin 150001, P. R. China
  • 收稿日期:2001-05-08 修回日期:2002-03-26 出版日期:2002-08-18 发布日期:2002-08-18
  • 基金资助:
    973 Project of China;the Doctoral Foundation of Education Ministry of China(EDAF24403003)

TOPOLOGY AND VORTEX STRUCTURES OF A CURVING TURBINE CASCADE WITH TIP CLEARANCE (Ⅰ)- EXPERIMENTAL MODEL AND TOPOLOGICAL FLOW PATTERNS ON BOTH ENDWALLS AND BLADE SURFACES

YANG Qing-hai, HUANG Hong-yan, HAN Wan-jin   

  1. Academy of Energy Science and Engineering, Harbin Institute of Technology, P. O. Box 458, Harbin 150001, P. R. China
  • Received:2001-05-08 Revised:2002-03-26 Online:2002-08-18 Published:2002-08-18
  • Supported by:
    973 Project of China;the Doctoral Foundation of Education Ministry of China(EDAF24403003)

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摘要： By means of ink trace visualization of the flows in conventional straight, positively curved and negatively curved cascades with tip clearance, and measurement of the aerodynamic parameters in the transverse section, and by appling topology theory, the structures on both endwalls and blade surfaces were analyzed. Compared with conventional straight cascade, blade positive curving eliminates the separation line of the upper passage vortex and leads the secondary vortex to change from close separation to open separation, while blade negative curving effects merely the positions of singular points and the intensities and scales of vortex.

Abstract: By means of ink trace visualization of the flows in conventional straight, positively curved and negatively curved cascades with tip clearance, and measurement of the aerodynamic parameters in the transverse section, and by appling topology theory, the structures on both endwalls and blade surfaces were analyzed. Compared with conventional straight cascade, blade positive curving eliminates the separation line of the upper passage vortex and leads the secondary vortex to change from close separation to open separation, while blade negative curving effects merely the positions of singular points and the intensities and scales of vortex.

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