[1]张焕好,陈志华,姜孝海,等.脉冲射流声场的直接计算[J].南京理工大学学报(自然科学版),2014,38(02):228-238.
　Zhang Huanhao,Chen Zhihua,Jiang Xiahai,et al.Direct calculation of acoustic field in pulse jet[J].Journal of Nanjing University of Science and Technology,2014,38(02):228-238.
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脉冲射流声场的直接计算
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《南京理工大学学报》（自然科学版）[ISSN:1005-9830/CN:32-1397/N]

卷:
38卷
期数:
2014年02期
页码:
228-238
栏目:
出版日期:
2014-04-30

文章信息/Info

Title:
Direct calculation of acoustic field in pulse jet
作者:
张焕好; 陈志华; 姜孝海; 黄振贵
南京理工大学 瞬态物理国家重点实验室,江苏 南京 210094
Author(s):
Zhang Huanhao; Chen Zhihua; Jiang Xiahai; Huang Zhengui
National Key Laboratory of Transient Physics,NUST,Nanjing 210094,China
关键词:
射流;  剪切层;  气动声学;  大涡模拟;  涡合并
Keywords:
jet flow;  shear layers;  aeroacoustics;  large-eddy simulation;  vortex pairing
分类号:
O354
摘要:
为了探讨亚声速射流气动声场中的主要噪声源以及声波产生机理,基于大涡模拟方法与高精度加权本质无振荡混合格式,对亚声速脉冲射流初始流场的发展过程进行了数值模拟,并根据得到的动力学流场对气动声场进行了直接计算。数值结果描述了射流剪切层在Kelvin-Helmholtz不稳定作用下失稳卷起小涡序列以及相邻小涡间相互旋转合并现象,并发现脉冲射流场的主要声源包括由前导压缩波形成的脉动噪声源、涡合并形成的四极子声源以及涡核内因涡卷起、变形与破碎所形成的湍流混合噪声源。其中,脉动噪声源最强,而涡合并所产生的四极子声源在整个声场中占主导地位。
Abstract:
To discuss the main sources of aeroacoustic field and generation mechanism of acoustic waves,the process of initial flow field development in a subsonic pulse jet is simulated by using the large-eddy simulation and the high-order hybrid-weight essentially non-oscillatory scheme,and the corresponding aeroacoustic field is calculated directly based on the obtained dynamics flow.The numerical results reveal the phenomena of the vortexlets rolled up due to the Kelvin-Helmholtz instability of jet shear layer and the pairing process of neighbor vortices.Calculation results also reveal that the main acoustic sources of the pulse jet include the pulse acoustic source generated by precursor compressible waves,the quadrupole source generated by the vortex pairing and the turbulent blend acoustic sources caused by rolling up,deforming and breakup of the vortexlets within the main vortex ring.The pulse acoustic source is the strongest and the quadrupole source dominates the whole acoustic field.

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备注/Memo

备注/Memo:
收稿日期:2012-10-23 修回日期:2013-01-21
基金项目:国家自然科学基金(11272156)
作者简介:张焕好(1985-),女,博士,主要研究方向:超声速流动及其声场,E-mail:zhanghuanhao9@163.com; 通讯作者:陈志华(1967-),男,博士,教授,主要研究方向:计算流体力学与爆炸力学,E-mail:chenzh@mail.njust.edu.cn。
引文格式:张焕好,陈志华,姜孝海,等.脉冲射流声场的直接计算[J].南京理工大学学报,2014,38(2):228-233.
投稿网址:http://njlgdxxb.paperonce.org
更新日期/Last Update: 2014-04-30