离心泵启动过程中，数值模拟方法需要给定叶轮转速随时间变化的经验公式，针对这些不足，从转矩平衡方程的角度出发，对ANSYS CFX软件进行二次开发.根据输入的驱动力矩曲线自动更新叶轮转速，建立包含离心泵和循环管路在内的三维封闭模型，并在此基础上对离心泵启动过程进行数值模拟.将计算结果与实验的特性曲线进行对比分析，二者在性能变化趋势上定性一致，证明此计算方法的有效性.

Numerical simulation of centrifugal pump during starting period requires an empirical formula for impeller rotating speed with time. This paper starts from the torque balance equation, and updates the rotational speed of impeller automatically, according to the input of a drive torque curve by secondary development of ANSYS CFX. A threedimensional model is established, which includes a centrifugal pump and the entire circulation pipeline. The starting period of centrifugal pump is then simulated. The result is compared with experimental curves, showing that they agree well in terms of qualitative trend of performance, and the method is effective. The method provides a new way of centrifugal pump simulation during starting period.