某型柴油机台架试验燃烧室、增压器进水问题分析

Analysis of Water Ingress Issue in Combustion Chamber and Supercharger During Bench Testing of A Certain Type of Diesel Engine

某型柴油机在备车过程中,发现燃烧室内存在水分。进一步扩大检查范围,发现增压器底部也有积水现象。该故障导致发动机点火不良,无法正常起动。为了查明原因,对柴油机的内部系统和外部系统进行了故障树分析,最终判断燃烧室及增压器进水的原因为烟气倒灌所致。随后,对烟气中的水蒸气含量以及背压阀的泄漏量进行了计算与分析,并根据分析结果采取了相应的解决措施,经过试验验证,发现该问题已得到解决。

During the preparation of a diesel engine,it was found that there was water in the combustion chamber.After further expan-ding the scope of inspection,it was found that there was also water accumulation at the bottom of the supercharger.This failure caused poor ignition of the engine and prevented it from starting normally.In order to identify the cause,a fault tree analysis was conducted on the internal and external systems of the diesel engine,and it was finally determined that the cause of water ingress into the combustion chamber and supercharger was due to backflow of flue gas.Subsequently,the water vapor content in the flue gas and the leakage rate of the backpressure valve were calculated and analyzed,and corresponding solutions were taken based on the analysis results.After ex-perimental verification,it was found that the problem had been resolved.