摘要
为了深入研究活塞冷却喷射的油束运动发展规律及不同活塞冷却方式对传热的影响,对比研究了3种活塞冷却方案。首先,在稳定的流场环境里对油束进行了验证,保证了后续瞬态强气流条件下喷射计算的准确度。通过曲轴箱内的仿真计算,得到了活塞冷却喷射图像、内冷油道与活塞底面的平均传热系数分布、活塞的温度分布。针对模型A(内冷油道强制冷却+活塞冷却喷射)活塞进行了温度测量,对比了各测点的试验温度与仿真温度,并研究了各方案的活塞温度场。结果表明:该算法可以比较准确地模拟活塞冷却喷射现象,准确反映机油在内冷油道和活塞底部的流动和传热规律,活塞温度场分布比较合理,监测点温度与试验比较吻合,最大偏差仅为5.24%。
In order to deeply research the development law of the motion of piston cooling jet and the influence of different piston cooling methods on heat transfer,three piston cooling proposals were compared.The jet was verified in a steady flow field to ensure the calculation accuracy in subsequent strong transient flow condition. Then the contours of the piston cooling jet,distribution of the average heat transfer coefficients of the internal cooling passage and piston cooling surface,the temperature distribution of pistons were obtained by numerical simulation in crankcase. The piston temperature of model A which includes forced cooling with the internal cooling passage and piston cooling jet was measured. Measured temperatures and simulated temperatures of several monitor points were compared. The piston temperature fields of all proposals were also studied. Results show that the analysis method can simulate the piston cooling jet accurately and can reflect the flow and heat transfer law in internal coolings passage and the piston bottom. The distribution of temperature fields is reasonable. The simulated temperatures of monitor points are consistent with the test results. The max deviation is only 5. 24%.
作者
丁宁
徐政
陈明
张小矛
王艳军
许睿
DING Ning;XU Zheng;CHEN Ming;ZHANG Xiaomao;WANG Yanjun;XU Rui(SAIC Motor Technical Center,Shanghai 201804,China;Shanghai Key Laboratory of Automobile Power-Train,Shanghai 201804,China)
出处
《内燃机工程》
CAS
CSCD
北大核心
2022年第2期56-63,共8页
Chinese Internal Combustion Engine Engineering
关键词
汽油机
活塞
活塞冷却喷射
内冷油道
两相流
gasoline engine
piston
piston cooling jet
internal cooling passage
two-phase flow
