航天器环境工程2025，Vol.42Issue(6)：630-637,8.DOI:10.12126/see.2025096
随机表面粗糙度对燃油喷嘴内部流动影响的数值分析
Numerical analysis of effects of random surface roughness on internal flow within a fuel nozzle
摘要
Abstract
To accurately characterize the random roughness of the inner walls of aerospace engine nozzles,a three-dimensional Gaussian random rough-surface modeling method based on Monte Carlo simulation was developed.Numerical simulations were performed on a typical nozzle with three roughness levels(Ra1.6,Ra0.8,and Ra0.4)to systematically analyze their effects on cavitating flow.The results showed that as the surface roughness decreased,the cavitation region extended further in the axial direction,while its radial scale and intensity diminished.Rough surfaces induced larger low-pressure zones at the inlet corner,and microscopic concavities served as nucleation sites for micro-cavitation.The peak internal flow velocity increased with roughness,whereas the outlet velocity and total mass flow rate remained nearly unchanged.Analysis of turbulent kinetic energy revealed that increasing roughness enhanced near-wall turbulence,thereby promoting local pressure reduction and cavitation inception.This study demonstrates that surface roughness regulates the internal flow mainly through its influence on local flow structures rather than on overall macroscopic performance,providing a theoretical basis for optimizing the design and manufacturing tolerances of liquid rocket engine nozzles.关键词
蒙特卡罗模拟方法/高斯随机粗糙表面/空化现象/计算流体动力学(CFD)/燃油喷嘴Key words
Monte Carlo simulation/Gaussian random rough surfaces/cavitation/computational fluid dynamics(CFD)/fuel nozzle分类
航空航天引用本文复制引用
刘宁,冯竞慧,章智敏,宫丽男,王丽霞..随机表面粗糙度对燃油喷嘴内部流动影响的数值分析[J].航天器环境工程,2025,42(6):630-637,8.基金项目
吉林省教育厅科学研究项目(编号:JJKH20251882KJ) （编号:JJKH20251882KJ）
吉林省科技厅"科创专员(科创副总)"项目 （科创副总）
吉林省高校优秀产学研协同创新人才项目 （）
长春市科协决策咨询研究课题(编号:CCKX-2025-09C) （编号:CCKX-2025-09C）
2025年度吉林省职业教育与成人教育教学改革研究课题(编号:2025ZCY426) （编号:2025ZCY426）
