摘要
某发动机把缸体由铸铝切换成铸铁时,发现爆震严重,性能降低。建立了简化的缸体有限元模型,进行了热负荷分析,结果表明缸套内表面顶部缸间部位出现热量积聚现象,是诱发爆震的主要原因。对缸体水套进行了优化设计,并进行了热负荷分析,结果显示最高温度明显降低,缸套内表面上部温度普遍低于200℃,有利于爆震的抑制。根据缸体优化设计方式制造的新状态缸体样件在台架试验中证明爆震得到有效控制,动力油耗接近铸铝缸体的水平。
The material of some engine cylinder block is changed from cast aluminum to iron,but serious knock is observed in dyno calibration test and therefore account for performance decrease.To solve the problem,a simplified cylinder block FEM model is built,thermal load analysis is conduct,and the result shows that the hot spot which is responsible for the knock is located around the top inner surface of the liner,especially the spot between two cylinders.Therefore the water jacket of the block is optimized and then thermal load analysis is conduct for new status cylinder block.The result shows that maximum temperature on the liner decreases remarkably and the temperature around upper liner inner surface is below 200°C,which is favorable for knock control.Finally,new status cylinder block is made and put into dyno test,and it is observed that knock is suppressed and performance of the engine is restored to the level of casting aluminum block engine.
作者
朱三平
钟翔波
ZHU San-ping;ZHONG Xiang-bo(SAIC-GM-Wuling automobile Co.,Ltd.,Liuzhou Guangxi 545007,China)
出处
《装备制造技术》
2019年第2期85-87,共3页
Equipment Manufacturing Technology
关键词
缸体
热负荷
爆震
有限元
cylinder block thermal load
knock
FEM
