针对柴油机活塞温度过高的问题,以某增压型柴油机活塞为研究对象,结合活塞温度场试验结果,在对活塞温度场计算模型进行验证的基础之上,在活塞上加开了内冷油道,得到了活塞降温冷却效果.通过轴向和径向移动活塞内冷油道,研究了不同位置内冷油道对活塞温度场的影响.采用CFD软件模拟计算得到了活塞内冷油道的温度和换热系数.研究结果表明:在活塞上加开内冷油道,可有效降低其顶部温度近40℃;当活塞内冷油道位置轴向移动4 mm时,可使其顶部温度变化幅度达10℃左右.研究结果为活塞内冷油道结构的设计提供了参考依据.%Aiming at the problem of high temperature of piston, a turbocharged diesel engine piston was taken as the research object. Com-bined with the results of piston temperature field test and on the basis of piston temperature field calculation model was verified, the structure of inner cooling gallery was designed in piston. Then the cooling effect of piston was obtained. By the axial and radial movement of piston in-ner cooling gallery, the effect of different position of inner cooling gallery on piston temperature field was studied. The temperature and heat transfer coefficient of the inner cooling gallery were simulated by CFD software. The results indicate that with the added structure of inner cooling gallery, the supreme temperature can be reduced nearly 40 ℃. When the inner cooling gallery of piston moves axially 4 mm, the temperature of piston top can be reduced about 10 ℃. The results provide a reference for the structure design of the inner cooling gallery.
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