冷却油腔机油振荡的流动和传热特性研究

Movement and Heat Transfer Characteristics of Oil Oscillating in Cooling Cavity

针对大功率柴油机组合式活塞冷却油腔内机油的流动和传热问题,采用数值解析方法,对不同曲柄转角下柴油机转速及入口流量对机油流动特性和传热特性的影响进行了研究。结果表明,冷却油腔的充油率与外冷却油腔壁面换热系数均随转速的增加呈现先减小后增加的趋势,充油率随入口机油流量的增加而增加,同时得到了大功率船用柴油机外冷却油腔振荡传热的无量纲关联式。

Aiming at the problems of oil flow and heat transfer in the oil gallery of high power diesel engine piston,the influences of engine speed and inlet flow rate on oil flow and heat transfer characteristics at different crank angles was studied by numerical analysis method.The results show that the oil filling rate and the heat transfer coefficient of the outer cooling chamber wall decrease first and then increase with the increase of the rotational speed.And the oil filling rate increases with the increase of the inlet oil flow.According to the simulation results,a non-dimensional correlation formula for the oscillating flow and heat transfer of outside cooling gallery of the high power diesel engine was obtained.