| 摘要:基于Ansys Fluent 软件的多相流模型和动网格技术，对某船用柴油机活塞冷却油腔内的流动过程开展三维数值仿真分析，探究不同柴油机转速和喷油速度下冷却油腔内的流场分布规律。研究结果表明:润滑油进入活塞冷却油腔后其形态发生显著变化，伴随活塞上下往复运动，活塞冷却油腔内将填充足够的润滑油；随着柴油机转速的提高，润滑油填充率和捕捉率不断下降；而随着喷油速度的提高，二者不断上升，进一步强化了活塞换热能力。 |
| 关键词: 船用柴油机 活塞 冷却油腔 流动特性 |
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| Numerical Simulation of Flow Characteristics of the Oil Spray Cooled Pistonon a Marine Diesel Engine |
| Peng Jun,Li Wenwen,Sun Lugang,Yuan Fei |
| Shanghai Marine Diesel Engine Research Institute, Shanghai 200090 |
| Abstract:The three-dimensional numerical calculation of the flow process of the cooling gallery in a marine diesel engine piston was conducted by the multi-flow model and dynamic meshing technique of the Ansys Fluent software. The flow distribution rule of the cooling gallery under different engine speeds and oil spray speeds was studied. The results showed that the shape of the oil changed significantly after entering the cooling gallery and the oil filled the cooling gallery sufficiently with the up and down reciprocating motion of the piston. The filling ratio and capture ratio declined with the increase of the engine speed and rose with the increase of the oil spray speed，which would further strengthen the heat transfer of the piston. |
| Key words: marine diesel engine piston cooling gallery flow characteristic |
