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NUMERICAL STUDY OF COMBINED CONVECTION HEAT TRANSFER FOR THERMALLY DEVELOPING UPWARD FLOW IN A VERTICAL CYLINDER
numerical combined convection thermally developing flow finite difference
2009/10/14
The problem of the laminar upward mixed convection heat transfer for thermally developing air flow in the entrance region of a vertical circular cylinder under buoyancy effect and wall heat flux bound...
柴油机缸内工作过程的数值模拟(Numerical Simulation of Working Process in the Cylinder of Diesel Engine)
柴油机 工作过程 多维
2009/5/22
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...
柴油机功率强化前后气缸盖的温度场模拟与试验(Simulation and Experiment of Temperature Field on Diesel Engine Cylinder Head before and after Enhancement of Power)
柴油机 气缸盖 温度场
2009/5/22
对功率强化前后的柴油机分别进行了性能仿真计算,进而确定了缸盖温度场计算的边界条件;利用有限元软件对气缸盖进行三维稳态热分析,并考虑了冷却水沸腾换热的影响;在该柴油机的单缸试验机上进行了稳态温度场测量试验,分析了试验和计算结果;得到了火力面边界条件的设置规律、稳态温度场随工况的变化关系和单缸机与多缸机的稳态温度场差别。
Determination of the temperature distribution in the wet cylinder sleeve in turbo diesel engine
Numerical techniques Heat loads of the wet cylinder sleeve FEM
2010/2/8
Purpose: The determination of the temperature distribution in the wet cylinder sleeve in initial phase of the work of turbo Diesel engine.Design/methodology/approach: The results of calculations of th...