Computational Aeroacoustics Simulation of an Air Micro-Injector with Dimples Shape on the Surface of Divergent Nozzle

14th International Conference on Fluid Control, Measurements and Visualization

Liu, Jun^1 ; Kagawa, Toshiharu^2

Keihin-Corp., Hoshakuji, 2021-8, Takanezawa-machi, Shioya-gun, Tochigi

329-1233, Japan^1

Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama

226-8503, Japan^2

关键词: Computational aeroacoustics simulation;    Divergent nozzles;    Inner surfaces;    Jet noise reduction;    Method base;    Time-accurate;    Williams;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/249/1/012009/pdf
DOI  :  10.1088/1757-899X/249/1/012009

来源: IOP

【 摘 要 】

As for jet noise reduction of an air micro-injector with divergent nozzle, dimples shape in the inner surface of divergent nozzle is proposed, in the paper, the jet noise reduction effect of dimples shape is numerically confirmed at delivery pressure 1.33 atm. and 2.0 atm. (fully expanded jet Mach number 0.65 and 1.05), using Ffows Williams and Hawkings (FW-H) method base on time-accurate solutions of Large-Eddy Simulation (LES). In addition, the influence of dimples nozzle on the jet flow field is numerically investigated.