DNS of a Turbulent Jet Issuing from an Acoustically Lined Pipe

被引:0
|
作者
Sandberg, R. D. [1 ]
Tester, B. J. [2 ]
机构
[1] Univ Southampton, Aerodynam & Flight Mech Grp, Southampton SO17 1BJ, Hants, England
[2] Univ Southampton, Inst Sound & Vibrat Res, Southampton SO17 1BJ, Hants, England
关键词
DNS; Jet Noise; Aeroacoustics; Acoustic Liner; Phased-Array; DIRECT NUMERICAL-SIMULATION; FLOW;
D O I
暂无
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
A series of direct numerical simulations (DNS) were conducted of turbulent jets issuing from acoustically lined pipe. The inclusion of the pipe in the simulations with a fully turbulent flow inside ensures that all possible noise generation mechanisms are represented. Earlier results from a similar pipe/jet configuration, albeit without acoustic liner treatment, showed contamination of the far field noise field by interior noise from the pipe. Therefore, here two key modifications were made. Firstly, the interior pipe walls were acoustically lined using an impedance condition. Secondly, the turbulent pipe inflow boundary condition was modified to reduce spurious noise introduced into the axisymmetric mode. The sound radiation from the pipe/jet configuration was analysed using a phased array source breakdown technique. It is demonstrated that the modification of the inflow boundary results in a strongly reduced contribution of the interior noise component to the farfield noise in the axisymmetric mode, while the acoustic liner is effective in reducing the interior noise contribution to farfield noise in the higher azimuthal modes. This enables the source breakdown analysis to extract the jet mixing noise contributions to the farfield much more clearly.
引用
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页码:378 / 387
页数:10
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