Research about the condensate water in lowpressure EGR system on engine and vehicle shows that flowcarrying 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 aircarrying 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 flowcarrying water. Accordingly, this provides a reference for the design of lowpressure EGR system and preventing the compressor impeller from the damage caused by condensate water in the low-pressure EGR system.
PENG Wen,SUN Yunlong,CHEN Liang,WU Guangquan,ZHAN Wenfeng,DUAN Xinlin.
Effects of Condensate Water on Performance and Structural Damage of Compressor Impeller in Low-Pressure EGR System[J]. Vehicle Engine. 2021, 0(5): 52-57
