基于AVL EXCITE Power Unit的仿真计算对湿式缸套穴蚀产生的原因及分析

Causes and Analysis of Wet Cylinder Liner Cavitation Caused by Cylinder Liner Vibration Based on AVL EXCITE Power Unit

当柴油机工作时,在活塞侧压力换向时的冲击力作用下,会引起缸套的机械振动,激发了缸套周向波型振动,从而使冷却水随着气缸套作高频振动,引起冷却水压力的周期变化,使冷却水交替膨胀和压缩,在水压低于冷却水温下的饱和蒸气压时形成气泡,当压力升高并达到一定值时,这些气泡发生爆破而产生强大的压力波,猛烈冲击和剥蚀缸套。本文从冷却水压方面进行仿真分析,为有效避免和预防湿式缸套穴蚀现象的产生提供依据。

When the diesel engine is working,under the impact force of the piston side pressure reversing,it will cause the mechanical vibration of the cylinder liner and stimulate the circumferential wave vibration of the cylinder liner,thus making the cooling water vibrate with the cylinder liner at high frequency,cause the periodic change of cooling water pressure,make the cooling water expand and compress alternately,and form bubbles when the water pressure is lower than the saturated vapor pressure under the cooling water temperature.When the pressure rises and reaches a certain value,these bubbles burst and produce strong pressure waves,which impact and denounce cylinder liners violently.In this paper,numerical analysis is carried out from two aspects of cooling water pressure and cylinder liner vibration in order to effectively avoid and prevent the occurrence of cavitation phenomenon of wet cylinder liner.