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基于Kirchhoff方法的亚声速平面混合层主涡对并声场分析

冯峰, 王强   

  1. 中国航天空气动力技术研究院, 北京 100074
  • 收稿日期:2012-04-16 修回日期:2012-05-31 出版日期:2013-03-25 发布日期:2013-03-29
  • 通讯作者: 王强,Tel.: 010-68743314 E-mail: qwang327@163.com E-mail:qwang327@163.com
  • 作者简介:冯峰 男, 博士研究生, 助理工程师。主要研究方向: 计算气动声学, 计算流体力学。 Tel: 010-88534185 E-mail: fengf@mail.ustc.edu.cn;王强 男, 博士, 研究员, 博士生导师。主要研究方向: 流动稳定性与流动控制, 计算流体力学。 Tel: 010-68743314 E-mail: qwang327@163.com
  • 基金资助:

    国家自然科学基金(11102198)

Analysis of Acoustic Field of Primary Vortex Pairing in Subsonic Plane Mixing Layers Using Kirchhoff Method

FENG Feng, WANG Qiang   

  1. China Academy of Aerospace Aerodynamics, Beijing 100074, China
  • Received:2012-04-16 Revised:2012-05-31 Online:2013-03-25 Published:2013-03-29
  • Supported by:

    National Natural Science Foundation of China (11102198)

摘要:

为拓展主涡对并气动声场计算分析方法研究,针对亚声速平面混合层主涡对并流动,采用直接数值模拟(DNS)方法求解获取近场声源,利用二维Kirchhoff频域法和时域法外推声辐射远场,并应用Kirchhoff频域法对主涡二次对并声辐射特征进行分析。研究结果表明:Kirchhoff频域法和时域法具有一定差异性,但与主涡对并直接声计算结果对比,显示二者计算精度相当且均具有较高的精确性。通过Kirchhoff频域法应用分析,清晰揭示出主涡二次对并各声模态与主涡卷起、对并过程的对应相关性,利用频域法这种良好的计算分析性能,本文进一步研究了混合层入口扰动相位差对涡并声场的影响,展现出主导声波在声场中的重要作用。

关键词: 声辐射, 可压缩混合层, Kirchhoff方法, 直接数值模拟, 主涡对并

Abstract:

In order to expand the calculation and analysis of an acoustic field generated by vortex pairing, the subsonic planar mixing layer vortex pairing is studied with numerical method. Direct numerical simulation (DNS) is employed to extract the acoustic source, the two-dimensional frequency domain and time domain Kirchhoff methods are applied to extrapolate the far-field radiated sound, while the frequency domain method is employed to investigate the sound radiation from the twice vortex pairings. The frequency domain and time domain Kirchhoff methods are different in some degree, but the computation results compared with the DNS show that they reach a similar high order of accuracy. An analysis with frequency domain Kirchhoff method reveals clearly that each acoustic mode of the twice vortex pairings corresponds to the vortex rolls and pairings respectively. Using the frequency domain method's good performance of computation and analysis, this paper further studies the influence of inflow instability waves with different phases on the acoustic field of vortex pairings, and exhibits that the dominant mode plays an important role in the acoustic field.

Key words: acoustic radiation, compressible mixing layer, Kirchhoff method, direct numerical simulation, primary vortex pairing

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