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系统地论述了双流道叶轮的设计方法，给出了用速度系数法设计轴面图时的系数值，提出了平面图流道中线的方程以及流道截面的面积变化规律
The design method of the double-flow impeller is systematically discussed. The coefficient values of the axial flow diagram with velocity coefficient method are given. The equations of midline of the plan flow channel and the area variation of the cross-section of the flow channel are proposed