航空学报 > 2016, Vol. 37 Issue (2): 475-483   doi: 10.7527/S1000-6893.2015.0112

湍流边界层厚度对三维空腔流动的影响

刘俊, 杨党国, 王显圣, 罗新福   

  1. 中国空气动力研究与发展中心空气动力学国家重点实验室, 绵阳 621000
  • 收稿日期:2015-03-06 修回日期:2015-04-24 出版日期:2016-02-15 发布日期:2015-04-30
  • 通讯作者: 刘俊,男,硕士,助理工程师。主要研究方向:非定常流动数值计算。Tel:0816-2462114,E-mail:ljun05@163.com E-mail:ljun05@163.com
  • 作者简介:杨党国,男,博士,副研究员。主要研究方向:气动噪声。Tel:0816-2462114,E-mail:yangdg-cardc@163.com;王显圣,男,博士,助理研究员。主要研究方向:流动稳定性。Tel:0816-2462114,E-mail:wxs2004@gmail.com
  • 基金资助:

    国家"973"计划(613240);空气动力学国家重点实验室研究基金(SKLA20140302)

Effect of turbulent boundary layer thickness on a three-dimensional cavity flow

LIU Jun, YANG Dangguo, WANG Xiansheng, LUO Xinfu   

  1. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2015-03-06 Revised:2015-04-24 Online:2016-02-15 Published:2015-04-30
  • Supported by:

    National Basic Research Program of China(613240);State Key Laboratory of Aerodynamics Foundation(SKLA20140302)

摘要:

采用脱体涡模拟(DES)方法开展了不同湍流边界层厚度(TTBL)下的三维空腔非定常流动数值计算。空腔长、宽、深比例为5:1:1,来流马赫数为0.85,雷诺数为13.47×106 m-1,各工况湍流边界层厚度比值为1:2:4:8。研究结果表明,湍流边界层厚度对自由剪切层的发展、空腔底部静态压力分布、脉动压力及空腔流动类型均有重要影响,且随着边界层厚度的增大,下游剪切层覆盖的范围会增大,但是剪切层增长率降低;空腔前后静态压力压差减小、压力梯度下降;腔内局部测点的脉动压力声压级下降,各阶声压峰值频率向低频方向偏移;空腔流动类型往开式流动方向转换。

关键词: 脱体涡模拟, 湍流边界层厚度, 三维空腔, 非定常流动, 流动类型

Abstract:

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.

Key words: detached eddy simulation, thickness of turbulent boundary layer, three-dimensional cavity, unsteady flow, flow type

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