火 箭 高 温 高 速 喷 流 注 水 降 噪 数 值 计 算 与 分 析

Based on Computational Fluid Dynamics（CFD）and the Mixture multiphase flow model，this study conducts numerical calculation of the average flow field under the conditions of an isolated rocket jet and water injection noise reduction. The influence of water flow on the average temperature，pressure，velocity and turbulent kinetic energy field of the rocket jet under the condition of water injection is analyzed. Reynolds Averaged Navier-Stokes （RANS）based jet noise prediction method is used to predict the spectrum and directivity of turbulent mixing noise and broadband shock noise from the jet with and without water injection. The effect of water injection on the turbulent mixing noise and broadband shock noise of the rocket gas jet at different frequencies and different observation positions is studied，providing a technical basis for the subsequent design of the rocket take-off noise reduction scheme.