| 杨志刚,刘洋,王毅刚.有限长圆柱绕流气动噪声源特性分析[J].声学技术,2019,38(1):5~14 |
| 有限长圆柱绕流气动噪声源特性分析 |
| Study of aeroacoustic noise source induced by a cylindrical flow of finite length |
| 投稿时间：2018-07-12 修订日期：2018-08-28 |
| DOI：10.16300/j.cnki.1000-3630.2019.01.002 |
| 中文关键词: 气动噪声 有限长圆柱 声源方程 偶极子源 |
| 英文关键词: aeroacoustic noise cylinder with limited length sound source equation dipole sound source |
| 基金项目:上海市地面交通工具空气动力与热环境模拟重点实验室资助项目；国家自然科学基金资助项目（51375342） |
|
| 摘要点击次数: 1314 |
| 全文下载次数: 782 |
| 中文摘要: |
| 气动噪声源的能级、分布特性及其产生根源还不够清晰。以有限长三维圆柱绕流为研究对象，基于声源方程分析气动噪声源的种类构成及其与气动参数的关系，通过数值计算得到可压非定常流场，利用气动参数定量计算圆柱顶部、中部和底部的声源大小分布，研究声源的分布特性和产生根源。结果表明，在有限长圆柱绕流场中，以偶极子声源为主，单极子声源可以忽略不计，四极子源项的值比偶极子小1~2个数量级。偶极子主要分布在来流分离点及圆柱后壁面湍流涡二次碰撞区域，四极子主要分布在来流分离点及其向后拖曳区域。偶极子声源主要由于圆柱两侧涡脱落处的脉动压力在横向（y方向）上的二阶梯度引起。以上结果为气动噪声控制的进一步研究提供了借鉴和参考。 |
| 英文摘要: |
| The energy level, distribution characteristics and origin of aerodynamic noise source are not clear enough. The three-dimensional flow around a finite-length cylinder is taken as the research object. Based on acoustic source equations, the types of aerodynamic noise sources and their relationship with aerodynamic parameters are analyzed. Compressible unsteady flow is calculated numerically and then the aerodynamic parameters are used to quantitatively calculate the sound sources distribution at the top, middle and bottom of the cylinder in order to study the distribution characteristics and origin of the sound sources. Results show that the dipole sound source is dominant in the flow field and the monopole sound source is negligible, the quadrupole sound source is 1-2 orders of magnitude smaller than the dipole sound source, the dipole are mainly distributed at the separation points of incoming flow and the secondary collision zone of eddy flow on the back of cylinder, and the quadrupole is mainly distributed at the separation points of incoming flow and its drag zone. The dipole sound source is mainly caused by the two-step gradient of dynamic pressure in the transverse direction (y-direction) at both sides of the cylinder. The above conclusions can provide a theoretical basis for the aerodynamic noise control. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
