ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of turbulent boundary layer thickness on a three-dimensional cavity flow
Received date: 2015-03-06
Revised date: 2015-04-24
Online published: 2015-04-30
Supported by
National Basic Research Program of China(613240);State Key Laboratory of Aerodynamics Foundation(SKLA20140302)
Unsteady numerical computation of a three-dimensional cavity with different thicknesses of turbulent boundary layer(TTBL) is conducted using the detached eddy simulation(DES) modeling approach. The rectangular cavity has an aspect ratio of 5:1:1, the Mach number is 0.85 and Reynolds number is 13.47×106 m-1. Four calculated TTBLs are at the ratio of 1:2:4:8. The results show that TTBL has a significant effect on the evolution of free shear layer, cavity floor pressure distribution, pressure fluctuation and cavity flow type. With the increase of TTBL, the region covered by free shear layer becomes larger but TTBL grows more slowly; the pressure differential between leading edge and trailing edge drops down and pressure gradient along the cavity floor also decreases. Meanwhile, sound pressure level of pressure fluctuation reduces, peaks of tonal modes transfer to lower frequencies and the cavity flow tends to open flow type with thicker turbulent boundary layer.
LIU Jun , YANG Dangguo , WANG Xiansheng , LUO Xinfu . Effect of turbulent boundary layer thickness on a three-dimensional cavity flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(2) : 475 -483 . DOI: 10.7527/S1000-6893.2015.0112
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