湖南大学学报（自然科学版）2026，Vol.53Issue(4)：62-70,9.DOI:10.16339/j.cnki.hdxbzkb.2026170
发动机活塞冷却喷嘴射流特性数值模拟与试验研究
Numerical simulation and experimental study on jet flow characteristics of engine piston cooling nozzle
摘要
Abstract
To meet the optimization demands of the piston cooling system in a highly enhanced engine,a CFD model of the piston cooling nozzle jet based on the dispersed-VOF method was established.The model incorporated the gas volume fraction and was validated by the results of the high-speed camera test under multiple operating conditions.The jet characteristics of the piston cooling nozzle and their influencing mechanisms were systematically investigated.Based on the parameters of jet velocity,turbulence intensity and dissipation,and divergence angle,the influences of engine speed(600～1 800 r/min)and length-diameter ratio of cooling nozzle(1～6)on jet characteristics were analyzed.This study provides the first quantitative revelation of the linear relationship between the gas volume fraction of the jet and engine speed,as well as the linear relationship between the divergence angle and engine speed:for every increase of 300 r/min in engine speed,the gas volume fraction is decreased by an average of 4.2%,and the jet divergence angle is increased by an average of 0.14°.It also finds that the nozzle with a length-diameter ratio of 4 exhibits relatively superior jet divergence characteristics and turbulence intensity during operation,which can effectively improve the oil intake efficiency and enhance the cooling effect.关键词
活塞/喷嘴/流体体积法/射流Key words
piston/nozzle/volume of fluid(VOF)/jet分类
机械制造引用本文复制引用
周长江,唐珊,刘亚辉,马寅杰..发动机活塞冷却喷嘴射流特性数值模拟与试验研究[J].湖南大学学报（自然科学版）,2026,53(4):62-70,9.基金项目
国家自然科学基金资助项目(52475054,52476112),National Natural Science Foundation of China(52475054,52476112) （52475054,52476112）
