引言 本文提出了一种计算冷却风扇三元流场的新方法，即任定准正交面法。该方法是把流线曲率法与两类相对流面理论结合在一起的一种直接三元解的数值方法，它把一个三元流场的求解分解为耦合的三个一元问题来迭代求解。求解速度快，占用的计算机内存少，具有工程实用价值。１　 Introduction In this paper, a new method for calculating the ternary flow field of a cooling fan is proposed, that is, Ren quasi-orthogonal surface method. This method is a numerical method of direct ternary solution combining streamline curvature method and two kinds of relative surface theory. It solves the solution of a ternary flow field by coupling three unary problems and iteratively solves the problem. Solving speed, take up less computer memory, with engineering practical value. 1