摘要
近年来,随着柴油机排放及功率要求的提高,柴油机热负荷显著的增加,其中活塞热负荷问题成为柴油机进一步强化的主要限制因素之一。对于高热负荷活塞,通常采用冷却通道的办法来降低活塞温度。使用CFD工具获取表面换热系数已越来越多的用于温度场的计算,本文通过流动计算获取冷却通道壁面及活塞底面的换热系数,并分析喷油冷却流场计算结果,提出改进措施。
Thermal loading in pistons of diesel engines has been increased dramatically in recent years due to applications of technologies to meet low emission and high power requirements.The problem of piston thermal loading is one of the main constraints to further strengthen the diesel engine.For pistons under higher thermal loading,the adoption of a cooling gallery is a common choice to limit the their temperature.Using CFD tool to get the coefficient of heat transfer for the surface is more and more used in temperature prediction in recent years.In this paper,the author gets the coefficient of heat transfer for the surface of the cooling gallery and piston bottom by flow calculation,analysis the result of calculation of piston cooling oil injection flow field,and propose improvement measures.
出处
《现代制造技术与装备》
2010年第5期1-3,共3页
Modern Manufacturing Technology and Equipment
关键词
活塞
冷却油腔
热负荷
流动模拟
piston
cooling gallery
thermal loading
numerical simulation of flow
