Volume 31 Issue 9
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LI Hong-yang, ZHENG Yun, LIU Da-xiang. Numerical simulation method of roughness induced transition[J]. Journal of Aerospace Power, 2016, 31(9): 2251-2257. doi: 10.13224/j.cnki.jasp.2016.09.026
Citation: LI Hong-yang, ZHENG Yun, LIU Da-xiang. Numerical simulation method of roughness induced transition[J]. Journal of Aerospace Power, 2016, 31(9): 2251-2257. doi: 10.13224/j.cnki.jasp.2016.09.026
shu

Numerical simulation method of roughness induced transition

doi: 10.13224/j.cnki.jasp.2016.09.026

  • 1. School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

  • 2. Collaborative Innovation Center for Advanced Aero-Engine, Beijing 100191, China

  • Received Date: 2014-12-23
  • Publish Date: 2016-09-28
    Abstract
  • For the purpose of simulating roughness induced transition, the boundary conditions of turbulent dissipation rate and eddy viscosity for rough surface were added to Langtry's γ-Reθ transition model; furthermore, equivalent sand surface roughness height was introduced to rewrite the correlation equations of the transition momentum thickness Reynolds number, making it appropriate for roughness-induced transition. Numerical simulation was made by referring to the wind tunnel data of several rough flat plate experiments and variable-pressure-gradient plate experiment, in which the results were satisfactory. Main conclusions are made as follows:surface roughness will enhance the heat transfer, increase the skin friction coefficient and shift the transition position upstream in general compared with smooth cases; effects for natural transition is significant, as surface roughness of 0.15 mm could shift the transition position upstream about 40%; while affect for separating induced transition is weaker; with the increase of surface roughness, transition position and separating bubble position are shifted backwards a little, the strength of separating bubble becomes weaker while the friction coefficient increases.

     

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