为充分了解分解炉的性能，应用适宜的模型来模拟分解炉内部三维流场是很有意义的。
In order to study characteristics of the calciner, it is significant to simulate the three-dimensional flow in calciner with proper mathematical models.
建立了内燃机换气系统普遍使用的弯曲圆形管道气体流场计算的三维模型及有关边界条件。
The model of three-dimensional flow in circular bend tube which is widely used in gas exchange system of internal combustion engine is developed in this paper.
给出了三维流场计算的模型方程，对倾斜壁面及入口的边界条件作了特殊处理。
Model equations for three dimensional calculation are given. Special treatment of boundary conditions at the entrance and the inclined wall is carried out.
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