基于不同亚格子模型的冲击射流噪声特性研究
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摘要
基于大涡模拟方法,采用三种亚格子模型对冲击射流的噪声特性进行了数值模拟,将模拟结果与实验数据对比分析,结果表明:Smagorinsky-Lilly(SL)模型数值耗散较大,模拟准确性较差;Wall-Adapting Local Eddy-Viscosity(WALE)模型和Kinetic-Energy Transport(KET)模型对总声压级的模拟结果比较准确;KET模型能够更加准确地模拟噪声频谱,而WALE模型对高频段噪声频谱的模拟误差偏大。最后,使用KET模型计算了噪声监测点在不同位置时冲击射流的总声压级,得到了不同冲击距离下的噪声指向分布情况。
Noise characteristics of an impinging jet are simulated using three different subgrid-scale models of large eddy simulation(LES). The simulation results are compared to experimental data.The results show that the Smagorinsky-Lilly(SL)model has more numerical dissipations and lower simulation accuracy. The Wall-Adapting Local Eddy-Viscosity(WALE)model and the Kinetic-Energy Transport(KET)model demonstrate good agreement with experimental data in the simulation of overall sound pressure level. The KET model can accurately capture the noise spectrum, whereas the WALE model displays some shortage in the simulation of high-frequency noise spectrum. Finally, the overall sound pressure level of noise monitoring points in different positions is calculated using the KET model. Noise directivity of the impinging jet is obtained under different impinging distances.
Noise characteristics of an impinging jet are simulated using three different subgrid-scale models of large eddy simulation(LES). The simulation results are compared to experimental data.The results show that the Smagorinsky-Lilly(SL)model has more numerical dissipations and lower simulation accuracy. The Wall-Adapting Local Eddy-Viscosity(WALE)model and the Kinetic-Energy Transport(KET)model demonstrate good agreement with experimental data in the simulation of overall sound pressure level. The KET model can accurately capture the noise spectrum, whereas the WALE model displays some shortage in the simulation of high-frequency noise spectrum. Finally, the overall sound pressure level of noise monitoring points in different positions is calculated using the KET model. Noise directivity of the impinging jet is obtained under different impinging distances.
引文
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[2] Krothapalli A, Rajkuperan E, Alvi F, et al. Flow Field and Noise Characteristics of a Supersonic Impinging jet[J].Journal of Fluid Mechanics, 1999, 392(1):155-181
[3] Bamberger A, Bansch E, Siebert K G. Experimental and Numerical Investigation of Edge Tones[J]. Zamm Journal of Applied Mathematics&Mechanics Zeitschrift F(u|¨)r Angewandte Mathematik Und Mechanik, 2005, 84(9):632-646
[4] Tsutsumi S, Ishii T, Ui K, et al. Study on Acoustic Prediction and Reduction of Epsilon Launch Vehicle at Liftoff[J]. Journal of Spacecraft and Rockets, 2015, 52(2):350-361
[5]谢军龙,张犯,郭宝坤,等.射流冲击圆锥噪声特性实验及数值分析[J].工程热物理学报,2016, 37(6):1212-1217XIE Junlong, ZHANG Yi, GUO Baokun, et al. Experimental and Numerical Analysis of Acoustic Characteristics of Jet Impinging on the Conical Obstacle[J]. Journal of Engineering Thermophysics, 2016, 37(6):1212-1217
[6]谢军龙,王芸芸,江振兴,等.轴对称受限射流冲击尖端障碍物流声特性[J].工程热物理学报,2014, 35(7):1321-1325XIE Junlong, WANG Yunyun, JIANG Zhenxing, et al.Flow and Noise Characteristics of Axisymmetric Confined Jet Impinging on the Wedge Obstacle[J]. Journal of Engineering Thermophysics, 2014, 35(7):1321-1325
[7] Smagorinsky J. General Circulation Experiments with the Primitive Equations[J]. Monthly Weather Review, 1963,91(3):99-164
[8] Nicoud F, Ducros F. Subgrid-Scale Stress Modelling Based on the Square of the Velocity Gradient Tensor[J]. Flow Turbulence and Combustion, 1999, 62(3):183-200
[9]俞建阳,王若玉,陈浮,等.不同亚格子模型的对比分析及其运用[J].工程热物理学报,2016, 37(11):2311-2318YU Jianyang, WANG Ruoyu, CHEN Fu, et al. A Comparison of the Different Subgrid-Scale Models and Its Application[J]. Journal of Engineering Thermophysics, 2016,37(11):2311-2318
[10]白海涛,赖焕新.基于三种亚格子模型的空腔振荡流动计算[J].华东理工大学学报(自然科学版),2016, 42(1):125-131BAI Haitao, LAI Huanxin. Calculation of Oscillation Flow in Open Cavity Using Three Sub-grid Scale Model[J]. Journal of East China University of Science and Technology(Natural Science Edition), 2016, 42(1):125-131
[11]温娟,唐大伟,张璟,等.空冷岛扁平管外翅片空间的大涡模拟研究[J].工程热物理学报,2012, 33(12):2126-2129WEN Juan, TANG Dawei, ZHANG Jing, et al. Large Eddy Simulation of the Fin Channel Outside the Flat Tube of the Air Cooled Island[J]. Journal of Engineering Thermophysics, 2012, 33(12):2126-2129
[12] Tide P S, Babu V. Numerical Predictions of Noise due to Subsonic Jets from Nozzles with and without Chevrons[J]. Applied Acoustics, 2009, 70(2):321-332