火箭高温高速喷流注水降噪数值计算与分析

doi:10.7527/S1000-6893.2022.27122

Abstract

Abstract:

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.

Key words: rockets, jet noise, noise reduction by water injection, aeroacoustics, multiphase flow

CLC Number:

V411.6

Junlin LIU, Xihai XU, Zhicheng ZHANG, Xiaoqian CHEN. Simulation and analysis of noise reduction in high⁃temperature and high⁃speed rocket jet by water injection[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2023, 44(7): 127122-127122.

Figures/Tables 29

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参数	数值
喷管入口直径D_i/mm	50
喷管出口直径D_e/mm	67
喷管长度L/mm	200
喷管进口总压P^*/Pa	5.5×10⁶
喷管进口总温T^*/K	4 500

参数	数值
摩尔系数M/（g∙mol^-1）	28.526
定压比热容c_p /（kJ∙kg^-1∙K^-1）	1.557 53
定容比热容c_v /（kJ∙kg^-1∙K^-1）	1.263 04

参数	数值
注水管长度L₁/mm	112
注水管宽度L₂/mm	16
注水角度θ/（°）	30
注水速度U_l/（m∙s^-1）	20
注水密度ρ/（kg∙m^-3）	998.2
注水温度T_l/K	288

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Simulation and analysis of noise reduction in high⁃temperature and high⁃speed rocket jet by water injection

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