摘要
为了分析活塞热负荷,利用CFD软件建立组合式活塞振荡冷却模型,并使用VOF多相流模型对冷却油腔的振荡换热过程进行数值模拟,得到活塞位于不同位置时油腔内机油填充率和壁面平均换热系数。计算结果表明冷却腔内机油填充率在35%左右,其波动不仅与活塞运动状态有关,还与伸缩套管固定管内油压变化有关。将冷却油腔近壁面边界条件作为活塞热分析边界条件,预测活塞温度场。
In order to analyze the thermal load of the piston of a low-speed two-stroke engine,a numerical simulation on the oil oscillating cooling is conducted by using a Computational Fluid Dynamics(CFD)software and volume of fluid multiphase model,oil fill ratio and average heat transfer coefficient of different crank angle are obtained.According to the calculated results,the cooling chamber oil fill ratio is around thirty five percent,and it is not only connected with piston motion,but also the pressure change in fixed tube of telescopic pipe.To predict piston thermal field,the cooling chamber near-wall boundary conditions are provided for the piston temperature field calculation.
作者
吕行
冯立岩
刘超
LYU Hang;FENG Liyan;LIU Chao(School of Energy and Power,Dalian University of Technology,Liaoning Dalian 116023,China;Technology Center of Dongfeng Motor Corporation,Wuhan 430058,China)
出处
《船舶工程》
CSCD
北大核心
2019年第S1期134-137,共4页
Ship Engineering
关键词
低速二冲程柴油机
组合活塞
振荡冷却
冷却油
两相流
流固耦合
温度场
low-speed two-stroke diesel engine
composite piston
oscillating cooling
cooling oil
two-phase flow
fluid-structure interaction
thermal field
