计算物理 ›› 2001, Vol. 18 ›› Issue (3): 193-198.

• 论文 •    下一篇

轴对称射流气动声场的数值模拟

胡国庆1, 刘明宇2, 傅德薰1, 马延文2   

  1. 1. LNM, 中国科学院力学研究所, 北京 100080;
    2. LHD, 中国科学院力学研究所, 北京 100080
  • 收稿日期:2000-02-01 修回日期:2000-06-12 出版日期:2001-05-25 发布日期:2001-05-25
  • 作者简介:胡国庆(1969-),男,博士,主要从事计算流体力学和计算气动声学研究.
  • 基金资助:
    国家自然科学基金(19872069)及九七三(G1999032805)资助项目

NUMERICAL SIMULATION OF THE SOUND FIELD GENERATED BY AXISYMMETRIC JET

HU Guo-qing1, LIU Ming-yu2, FU De-xun1, MA Yan-wen2   

  1. 1. LNM, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, P R China;
    2. LHD, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, P R China
  • Received:2000-02-01 Revised:2000-06-12 Online:2001-05-25 Published:2001-05-25

摘要: 构造了Kirchhoff积分和CFD计算相结合的算法,采用高精度差分格式对不同喷口马赫数的轴对称射流进行数值模拟,并以此作为近场声源,运用Kirchhoff积分方法研究远场气动噪声.数值结果表明,远场噪声具有方向性,噪声声压在离开对称轴20°处达到最大值.随着传播距离增大,噪声方向性逐渐减弱.

关键词: 气动噪声, 轴对称射流, Kirchhoff积分, 紧致差分格式

Abstract: An algorithm is proposed to combine Kirchhoff integral and an unsteady flow computation. Axisymmetric jet flows are given by DNS using 5-order accurate upwind compact scheme and 3-order accurate Runge-Kutta scheme. Kirchhoff integral is used to predict the far-field sound. Numerical results show that far-field sound pressure has the directivity and reaches maximal value at 20° diverged from the flow direction. The directivity is attenuating while the propagation distance is increasing.

Key words: aeroacoustic noise, axisymmetric jet, Kirchhoff integral, compact difference scheme

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