旋转射流的涡声问题研究
Research on the Rotating Jet Noise Based on the Vortex-Sound Theory

作者: 薛永飞 * , 黄雪芬 , 涂运冲 , 吴克启 :华中科技大学能源与动力工程学院;

关键词: 旋转射流大涡模拟涡声分析Rotating Jet Large Eddy Simulation Vortex Sound Analysis

摘要:

本文针对旋转射流风机不同动静叶片间距,采用非定常结合大涡模拟的方法研究了后导叶射流风机的内流特性、外流特性及声传播问题,主要结论如下:叶轮动静间距的可调余地较大;动叶中的卡门涡和叶顶泄漏涡,以及叶片前缘产生的近壁叶道涡组成了动叶组的特色涡,涡声的源头位于前缘和尾缘;流场外侧的湍流粘性和有效粘性加剧了湍流的声音耗散;压力的时间、频率特性与声压的时频特性呈正相关的关系,声压的幅射主要位于轴线四周。

The internal flow and outflow field characteristics, and sound propagation problems of the rotating jet fan with the behind guide vanes are studied using the combination of the unsteady flow and large eddy simulation. The main conclusions are as follows: the pitch between the impeller and the guide vanes has a bigger adjustable space; the rotor blades is the main sound source surface, the Karman vortex and tip leakage vortex, and channel vortex near the wall from the leading edge is characteristics vortex of the moving blades, the sound sources of vortex generators is located in the leading and trailing edge; the turbulent viscosity and effective viscosity of outflow field intensifies the dissipation of the turbulent sound; the pressure characteristics of time and frequency shows a positive correlation to that of the sound pressure, the radiation of sound pressure mainly point to the axis around.

文章引用: 薛永飞 , 黄雪芬 , 涂运冲 , 吴克启 (2012) 旋转射流的涡声问题研究。 现代物理, 2, 43-48. doi: 10.12677/MP.2012.23008

参考文献

[1] F. Q. Hu, M. Y. Hussaini and J. Manthey. Low-dissipation and -dispersion Runge-Kutta schemes for computational acoustics. Journal of Computational Physics, 1996, 124: 177-191.

[2] S. C. Chang. The method of space-time conservation element and solution element—A new approach for solving the Navier Stokes and Euler equations. Computational Physics, 1995, 119(2): 295-324.

[3] 刘敏, 吴克启. 基于非结构网格CE/SE算法圆柱绕流气动声场模拟[J]. 工程热物理学报, 2009, 30(2): 227-229.

[4] E. Mollo-Christensen, M. A. Kolpin and J. R. Martuccelli. Ex- periments on jet flows and jet noise far-field spectra and directivity patterns. Journal of Fluid Mechanics, 1964, 18(2): 285- 301.

[5] J. L. Stromberg, D. K. McLaughlin and T. R. Troutt. Flow field and acoustic properties of a Mach number 0.9 jet at a low Reynolds number. Journal of Sound and Vibration, 1980, 72(2): 159- 176.

[6] 陈翼, 张林进, 叶旭. 射流混合器内气体湍流扩散过程的CFD数值模拟与实验研究初探[J]. 过程工程学报, 2007, 7(5): 865-870.

[7] J. M. Tyler, T. G. Sofrin. Axial flow compressor noise studies. SAE Transactions, 1962, 70: 309-332.

[8] 吴秉礼, 李文洲. 轴流通风机的工程设计方法——设计手册[M]. 吉林: 吉林大学出版社, 2007.

[9] 吴克启. 透平压缩机械[M]. 北京: 机械工业出版社, 1989.

[10] M. E. Goldstein. Unsteady vertical and entropic distortions of potential flows round arbitrary obstacles. The Journal of Fluid Mechanics, 1978, 89: 433-468.

[11] 蔡增基, 龙天渝. 流体力学泵与风机(第四版)[M]. 北京: 中国建筑工业出版社, 2008.

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