高速柴油机活塞温度试验与热力耦合仿真  

Temperature Experiment and Thermo-Mechanical Coupled Simulation of High-Speed Diesel Engine Piston

作　　者：宁海强[1,2] 孙平[1] 梅德清[1] 肖淑梅[1] 胡鹏[1] 

机构地区：[1]江苏大学汽车与交通工程学院,镇江212013 [2]镇江船艇学院,镇江212003

出　　处：《内燃机工程》2014年第1期105-109,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金资助项目(51076069);江苏省博士研究生科研创新资助项目(CXZZ11_0562)

摘　　要：为改善现代高速、高强化柴油机活塞热负荷高的难题,以算例柴油机实测活塞温度为依据,利用温度拟合法模拟计算得出的温度场与实测结果吻合良好。以活塞、活塞销、连杆和气缸套作为耦合系统,在考虑各组件接触关系的基础上,将计算得出的活塞温度场作为温度载荷与标定工况下的燃烧压力、惯性力等机械载荷进行热力耦合计算,求得活塞在热力耦合作用下位移场分布情况。根据计算结果,对活塞结构做适当改进并进行模拟计算。研究结果表明:改进后活塞最高温度降低26℃,验证了结构改进的合理性,有效降低了高速柴油机活塞的热负荷。To improve piston thermal load of modern high-duty high speed diesel engine, based on measured piston temperature,the piston temperature field was simulated using temperature fitting method. The results agreed well with the measured data. Taking piston,piston pin,connecting rod and cylinder liner as a coupled system and considering the contact relation of these components, the thermo-mechanical coupled calculation was completed with the thermal load got from calculated temperature field and the mechanical load caused by explosive force,inertial force etc. in rated condition to obtain piston displacement field under the thermo-mechanical coupling. According to the calculation results, the piston structure was appropriately improved and the temperature field was simulated again. The results show that max. piston temperature decreases by 26℃. It is validated that the structural improvement is rational, reducing effectively piston ther- mal load.

关 键 词：内燃机 高速柴油机 活塞 温度场 热负荷 热力耦合 强化冷却 仿真 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]