Abstract: In the process of transportation for clean oil, tank truck transportation account for a large portion, but air-resister occurs easily in the process of unloading, this will lead to some clean oil left in the tank. Through drawing the geometrical model of the tank truck, set up the temperature field mathematical model and boundary conditions, and made use of CFD software to solve the problem, the spread of temperature field was acquired. Combining the conditions that lead to air-resister, the best time for unloading clean oil was received. The field practice indicates that the time interval for unloading can conduct actual production exercises and improve work efficiency.

Key words: Tank truck , Numerical simulation , Clean oil temperature field , Air-resister

摘要：     　在轻质油品的输送中，铁路罐车输送占有较大的比例，但是在卸油的过程中容易产生气阻断流，使油品不能卸净。通过绘制罐车的几何模型，建立了油罐车内轻油温度场数学模型和求解边界条件；利用计算流体力学软件进行求解，获得了罐内轻油温度场分布；结合气阻发生条件，确定了轻油罐车最佳的卸油作业时间。现场实践表明：确定的最佳卸油作业区间能够指导生产实际，提高工作效率。

关键词: 铁路罐车 , 　数值模拟 , 　轻质油温度场 , 　气阻