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Volume 40 Issue 7
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Journal of Beijing University of Aeronautics and Astronautics  > 2014  >  40(7): 978-983.
Zhou Ning, Ze Cheng, Pan Chonget al. Effect of Reynolds number on characteristics of separated shear layer transition of backward facing step[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(7): 978-983. doi: 10.13700/j.bh.1001-5965.2013.0481(in Chinese)
Citation: Zhou Ning, Ze Cheng, Pan Chonget al. Effect of Reynolds number on characteristics of separated shear layer transition of backward facing step[J]. Journal of Beijing University of Aeronautics and Astronautics, 2014, 40(7): 978-983. doi: 10.13700/j.bh.1001-5965.2013.0481(in Chinese)
shu

Effect of Reynolds number on characteristics of separated shear layer transition of backward facing step

doi: 10.13700/j.bh.1001-5965.2013.0481

  • 1. Key Laboratory of Fluid Mechanics of Education Department, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

  • 2. China Academy of Space Technology, Beijing 100081, China;

  • 3. Key Laboratory of Fluid Mechanics of Education Department, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

  • Received Date: 16 Sep 2013
  • Publish Date: 20 Jul 2014
    Abstract
  • The backward-facing step flow is a classical model for the investigation of shear layer separation and reattachment characteristics. The transitional shear layer and its Re dependence was discussed by using two-dimensional time-resolved particle image velocimetry (PIV) measurement. It was observed that the location of reattachment point moves upstream if Re increases, while the transition point of the shear layer moves forward at the same time, leading to the dimensionless reattachment length inversely proportional to Re. In addition, before the transition occurs, the perturbation contained within the shear layer presents initial exponential growth, whose spatial growth rate is positively correlated with Re.

     

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