在对现有双流道式叶轮水力模型进行归纳总结基础上 ,给出了用速度系数法设计轴面图时的各系数值 ,提出了新的平面图流道中线方程、外流道曲线方程以及流道中线截面面积变化规律。本文最后还给出了设计实例和试验结果。实际应用结果表明 ,本方法完全可行 On the basis of summarizing and summarizing the existing hydraulic model of double-flow impeller, the paper gives the coefficient values ​​when designing the axial map with the velocity coefficient method, and presents the new midline equation of the flow channel, the curve equation of the outer flow channel and the flow channel Variation of cross section area of ​​midline. Finally, this paper also gives the design examples and test results. The practical application shows that this method is feasible