内燃机工程2026，Vol.47Issue(4)：80-91,12.DOI:10.13949/j.cnki.nrjgc.2026.04.009
活塞冷却射流多尺度涡破碎机理与喷嘴参数协同优化
Multiscale Vortex-Induced Breakup and Coordinated Optimization of Nozzle Parameters for Piston Cooling Oil Jets
张华兵 1梁刚 1徐雨轩 1浦卫华 1张文正 1郑亮1
作者信息
- 1. 先进船舶发动机技术全国重点实验室,上海 201108||中国船舶集团有限公司第七一一研究所,上海 201108
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摘要
Abstract
To address the low oil-droplet impingement capture efficiency and poor cooling performance in marine diesel engine piston cooling jets,a wall modeled large eddy simulation(WMLES)coupled with the volume of fluid(VOF)method,incorporating the S-Omega subgrid-scale model,was employed.Numerical simulations and experiments were conducted to investigate the jet breakup mechanism and nozzle parameter optimization.The results show that the relative error in predicting droplet capture rates is below 5％.The near-field jet breakup is dominated by a multiscale turbulent kinetic energy cascade under axisymmetric mode,where axially extended vortices induce interfacial instability,axisymmetric vortex rings promote film stripping,and small-scale vortices further fragment droplets through energy cascade processes.Based on orthogonal experiments,an optimal nozzle configuration with an aspect ratio of 1.8 and a convergence angle of 30° is identified,increasing the capture efficiency by 5.1％.关键词
活塞冷却射流/壁模化大涡模拟/流体体积方法/涡动能级串/射流破碎/参数敏感性Key words
piston cooling jet/wall modeled large eddy simulation(WMLES)/volume of fluid(VOF)/vortex kinetic energy cascade/jet breakup/parameter sensitivity分类
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张华兵,梁刚,徐雨轩,浦卫华,张文正,郑亮..活塞冷却射流多尺度涡破碎机理与喷嘴参数协同优化[J].内燃机工程,2026,47(4):80-91,12.
