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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1998, Vol. 19 ›› Issue (5): 636-640.

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COMMENT ON TWO DIMENSIONAL UNSTEADY SEPARATION CRITERIA

Lü Zhiyong, Jia Zhigang   

  1. Institute of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083
  • Received:1997-01-13 Revised:1998-04-15 Online:1998-10-25 Published:1998-10-25

Abstract:

It is shown that there are some discrepanicies in the analogy criteria of two dimensional unsteady separation and three dimensional steady separation. Furthermore, based on Lagrangian method to describe fluid motion, the unsteady separation phenomenon could be explained by means of streaklines rather than path lines.

Key words: unsteady flow, separation, cr iter ion

CLC Number: