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中文摘要：
利用CFD软件AVL-Fire对YD490ZL型柴油机进气、压缩、燃烧过程进行了多维瞬态数值模拟。通过对柴油机工作过程中不同时刻气体流动、壁面传热、燃油喷雾雾化、颗粒形成等因素的分析,结果认为适当调整燃烧室中心相对气缸中心在X方向的距离,可以使燃烧更加充分、提高柴油机的燃油经济性;燃烧室换热系数不仅随空间位置变化,而且还随时间变化而各不相同,通过这种多维瞬态计算能够提供不同时刻、不同位置的换热系数及温度分布,为固体有限元计算分体提供最有利的边界条件;进气过程能形成非常明显的进气涡流;在活塞接近上止点时,虽然受到挤流的影响,但是燃烧室内的气体流动依然存在环形运动。
英文摘要：
Multi-dimensional transient numerical simulation was done for induction,compression,combustion process of YD490ZL diesel engine by AVL-Fire.The gas flow,heat transfer in cylinder wall,fuel spray,particle formation and so on in different time of entire working process were analyzed for providing certain reference for optimization design of diesel engine cylinder.Combustion will be more sufficient and fuel economy will be higher if the relative distance between the center of combustion chamber and cylinder at X direction is adjusted.The heat transfer coefficient changes with the space position as well as time.The distribution of heat transfer coefficient and temperature at different time and position was provided by multi-dimensional transient calculation which provided the best boundary condition for finite element calculation.Intake swirl was formed obviously during the intake process;ring movement of gas flow in combustion chamber was still existed near the top dead center while it wasinfluenced by squish flow.
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