Influence of Cylinder Liner Vibration Response Induced by Piston Slapping on Cavitation

LIU Dong; HUANG Guolong; SUN Shilei; LI Guoxing; WANG Tie; WEI Jianlong

Vehicle Engine ›› 2021, Vol. 0 ›› Issue (2) : 64-70.

LIU Dong¹,HUANG Guolong²,SUN Shilei³,LI Guoxing^1,2,WANG Tie¹,WEI Jianlong¹

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Abstract

In order to study the influence of the cylinder liner vibration response induced by the side slapping of piston on the waterside cavitation of cylinder liner, a China Ⅵ watercooled diesel engine was taken as the research object and the coupling analysis of the cylinder wall vibration and the waterside hydrodynamic behavior was carried out by combining structural dynamics and computational fluid mechanics. The cylinder liner wall vibration was measured on the diesel engine test bench, the transient dynamic model of cylinder assembly for diesel engine was established, and the vibration characteristics of cylinder liner under the piston side slapping were studied based on the simulation and the measurement. Then the transient dynamics calculation results were input into the twodimensional cooling water jacket model in the form of a moving grid for numerical simulation and the influence of factors such as cylinder liner vibration form, water jacket thickness and outlet pressure on cavitation were studied. The results show that the high frequency vibration of cylinder liner is related to the natural mode of structure under the side force of piston and the highfrequency modal vibration of cylinder liner and the water jacket thickness have significant effect on the cavitation of cooling water field. Increasing the outlet pressure of water jacket can slightly reduce the intensity of cavitation, while increasing the water jacket thickness has a more pronounced effect on suppressing the cavitation on the water side of cylinder liner.

Key words

cylinder liner / water jacket / vibration / cavitation

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LIU Dong,HUANG Guolong,SUN Shilei,LI Guoxing,WANG Tie,WEI Jianlong. Influence of Cylinder Liner Vibration Response Induced by Piston Slapping on Cavitation[J]. Vehicle Engine. 2021, 0(2): 64-70