文献类型：期刊文献

中文题名：Numerical Study of Controlling Jet Flow and Noise using Pores on Nozzle Inner Wall

英文题名：Numerical Study of Controlling Jet Flow and Noise using Pores on Nozzle Inner Wall

作者：Lin Jian[1];Shi Zhixiao[1];Lai Huanxin[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：27

期号：2

起止页码：146

中文期刊名：Journal of Thermal Science

外文期刊名：JOURNAL OF THERMAL SCIENCE

收录：;EI(收录号：20181204929036);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000427726400007)】；CSCD:【CSCD2017_2018】；

基金：This study is funded by the National Natural Science Foundation of China under Grant 51576067.

语种：英文

中文关键词：noise of jet flow;pores of blind holes;passive method;nozzle wall treatment

外文关键词：noise of jet flow; pores of blind holes; passive method; nozzle wall treatment

摘要：In this paper, the feasibility of controlling the subsonic jet flow and its noise using pores of blind holes added on the nozzle inner wall is explored numerically. These pores are intended to introduce disturbances to the shear layer so as to change the flow mixing. This passive strategy has not been attempted so far. A convergent nozzle with a cylindrical extension is selected as the baseline case. Three nozzles with pores on the inner wall are set up. Validations of the numerical settings are carried out, then the compressible turbulent jets at the exit Math number Mj = 0.6 in the four nozzles are calculated by large eddy simulations （LES）, while the ra-diated sounds are predicted by the FW-H acoustic analogy. The results show that the blind holes have produced some effects on weakening the turbulence intensity in the shear layer. Comparison reveals that both temporal and spatial correlations of the turbulent fluctuations in the modified cases are suppressed to some extent. Meanwhile, the porous nozzles are shown to suppress the pairing of vortices and enhance the flow mixing, and therefore, the development of shear layer and the fragmentation of large scale vortices are accelerated.
In this paper, the feasibility of controlling the subsonic jet flow and its noise using pores of blind holes added on the nozzle inner wall is explored numerically. These pores are intended to introduce disturbances to the shear layer so as to change the flow mixing. This passive strategy has not been attempted so far. A convergent nozzle with a cylindrical extension is selected as the baseline case. Three nozzles with pores on the inner wall are set up. Validations of the numerical settings are carried out, then the compressible turbulent jets at the exit Mach number M-j = 0.6 in the four nozzles are calculated by large eddy simulations (LES), while the radiated sounds are predicted by the FW-H acoustic analogy. The results show that the blind holes have produced some effects on weakening the turbulence intensity in the shear layer. Comparison reveals that both temporal and spatial correlations of the turbulent fluctuations in the modified cases are suppressed to some extent. Meanwhile, the porous nozzles are shown to suppress the pairing of vortices and enhance the flow mixing, and therefore, the development of shear layer and the fragmentation of large scale vortices are accelerated.