活塞喷油冷却流动和换热特性的研究  

A Study of Flow and Heat Transfer Characteristics about Piston Injection Oil Cooling

作　　者：王新[1] 刘世英[1] 

机构地区：[1]山东理工大学交通与车辆工程学院,山东淄博255091

出　　处：《小型内燃机与车辆技术》2015年第1期54-58,共5页Small Internal Combustion Engine and Vehicle Technique

基　　金：山东省自然科学基金项目(ZR2010EM070)

摘　　要：采用CFD软件Fluent对某活塞半开式内冷油腔的振荡冷却进行了三维数值模拟计算,模拟了不同喷油速度和转速下的半开式内冷油腔内机油的流动和换热特性。研究结果显示:随着发动机转速的增加,机油的捕捉率和填充率有所下降;随着喷油速度的提高,机油的捕捉率和填充率有所提高;内冷油腔壁面的平均体积分数随着转速的增加而降低,但是壁面的循环换热系数却随着转速的增加而有所升高,从而得出振荡可以强化换热.此模拟结果可以为活塞的优化设计和温度场的分析起到指导作用.A three-dimensional numerical simulation about oscillation cooling of a half open cooling gallery of piston is conducted by using CFD soft Fluent. The study simulates the oil flow and heat transfer characteristics of a half open cooling gallery under different injection speeds and engine speeds. The result shows the oil capture ratio and filling ratio decline with the increase of engine speed;the oil capture ratio and filling ratio increase as injection speed rises; the average volume fraction of the cooling gallery wall decreases with the rise of engine speed. But the cyclic heat transfer coefficient rises as the engine speed increases due to oscillation strengthening heat transfer. The results of the simulation play a guiding role of the optimized design and the temperature analysis of the piston.

关 键 词：活塞 内冷油腔 强化换热 优化设计 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]