低压EGR冷凝水对压气机叶轮性能和结构破坏的影响研究  

Effects of Condensate Water on Performance and Structural Damage of Compressor Impeller in Low-Pressure EGR System

作　　者：彭文 孙云龙 陈良 吴广权 占文锋 段心林 PENG Wen;SUN Yunlong;CHEN Liang;WU Guangquan;ZHAN Wenfeng;DUAN Xinlin(GAC Automotive Research&Development Center,Guangzhou 511434,China)

机构地区：[1]广州汽车集团股份有限公司汽车工程研究院,广东广州511434

出　　处：《车用发动机》2021年第5期52-57,共6页Vehicle Engine

基　　金：国家重点研发计划资助(2017YFB0103300)。

摘　　要：在发动机与整车上对低压EGR系统冷凝水的研究表明,压气机前管路中存在的气流裹挟的水珠和沿壁面流动的稀疏水膜对压气机叶轮构成潜在损伤风险,此外压前管路存在积水区,积聚的冷凝水遇冷结冰而被吸入也将对压气机叶轮形成潜在的损伤风险.针对以上情形分别设计试验,结果表明压气机叶轮主要受气流裹挟进入的冷凝水损伤,壁面流形式的冷凝水对叶轮几乎无损伤,在有限次数的极端情况下,压前冷凝水积聚区结冰对叶轮损伤的风险也很小,而叶轮镀层的应用能够显著降低冷凝水对叶轮的损伤,因此设计上应尽量减少随气流裹挟进入压气机的冷凝水.本研究为低压EGR系统设计以及压气机叶轮预防低压EGR系统冷凝水破坏提供了设计参考.Research about the condensate water in low-pressure EGR system on engine and vehicle shows that flow-carrying water droplet and flowing sparse water film along the wall before the compressor will pose a potential damage risk.In addition,the accumulated condensate water in the pipe before compressor will also pose a potential risk due to being sucked with the flow after freezing into ice.Therefore,different experiments are designed for the above mentioned cases.The results show that the main damage of compressor impeller is from the air-carrying condensate water.The flowing condensate water on the wall does little damage to the impeller.In the extreme cases of finite times,there is only a little risk for compressor impeller due to the ice frozen from condensate water before the compressor.The application of impeller coating can significantly reduce the damage of impeller caused by condensate water.Therefore the design should be conducted to reduce the intake of flow-carrying water.Accordingly,this provides a reference for the design of low-pressure EGR system and preventing the compressor impeller from the damage caused by condensate water in the low-pressure EGR system.

关 键 词：压气机 叶轮 冷凝水 损伤 废气再循环 

分 类 号：U464.135[机械工程—车辆工程]