An Analysis of the Factors Influencing Cavitation in the Cylinder Liner of a Diesel Engine  

作　　者：Dehui Tong Shunshun Qin Quan Liu Yuhan Li Jiewei Lin 

机构地区：[1]State Key Laboratory of Engine Reliability,Weifang,261061,China [2]Weichai Power Co.,Ltd.,Weifang,261061,China [3]State Key Laboratory of Engines,Tianjin University,Tianjin,300350,China

出　　处：《Fluid Dynamics & Materials Processing》2022年第6期1667-1682,共16页流体力学与材料加工（英文）

基　　金：supported by the Science Fund of the State Key Laboratory of Engine Reliability(No.SKLER-201902).

摘　　要：Avoiding cavitation inside the water jacket is one of the most important issues regarding the proper design of a diesel engine’s cylinder liner.Using CFD simulations conducted in the frame of a mixture multiphase approach,a moving grid technology and near-wall cavitation model,in the present study the factors and fluid-dynamic patterns that influence cavitation are investigated from both macroscopic and mesoscopic perspectives.Several factors are examined,namely:wall vibration,water jacket width,initial cavitation bubble radius,coolant temperature,and number of bubbles.The results show that reducing the cylinder liner vibration intensity can significantly weaken the cavitation.Similarly,increasing the water jacket width is instrumental in avoiding cavitation.Increasing the coolant temperature reduces the microjet velocity related to bubble collapse,while increasing the number of bubbles produces a much larger water hammer pressure that can cause more damage to the cylinder liner.

关 键 词：CAVITATION cavitation dynamics diesel engine two-phase flow water hammer 

分 类 号：O35[理学—流体力学]