Applied Mathematics and Mechanics (English Edition) ›› 1985, Vol. 6 ›› Issue (10): 975-979.

• Articles • 上一篇    下一篇

THE THREE-DIMENSIONAL UNSTEADY BOUNDARY LAYER OVER AN IMPULSIVELY STARTED ROTATING DISK

陈允明   

  1. Institute of Mechanics, Chinese Academy of Sciences, Beijing
  • 收稿日期:1984-08-26 出版日期:1985-10-18 发布日期:1985-10-18

THE THREE-DIMENSIONAL UNSTEADY BOUNDARY LAYER OVER AN IMPULSIVELY STARTED ROTATING DISK

Chen Y. M.   

  1. Institute of Mechanics, Chinese Academy of Sciences, Beijing
  • Received:1984-08-26 Online:1985-10-18 Published:1985-10-18

摘要: The unsteady boundary layer over an impulsively started rotating disk is studied, a complete solution describing the smooth transition from vortex diffusion at ωt=0 to Kármán’s steady solution is obtained by series expansion and its numerical continuation. The angle of body streamlines, together with experimental values, are given as the function of time t as well as the moment coefficient CM and on-coming velocity ω(∞).

关键词: Euler equation, ill-posed problem, formal solution, equation secondaire

Abstract: The unsteady boundary layer over an impulsively started rotating disk is studied, a complete solution describing the smooth transition from vortex diffusion at ωt=0 to Kármán’s steady solution is obtained by series expansion and its numerical continuation. The angle of body streamlines, together with experimental values, are given as the function of time t as well as the moment coefficient CM and on-coming velocity ω(∞).

Key words: Euler equation, ill-posed problem, formal solution, equation secondaire

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