Abstract：The drawing method for the double channel impeller is studied. It is found that there is an inconformity between the dimensions of plane-view and pinacoid-view of fluid cross-section.The shape of cross-section is an ellipse folded in half through one symmetry axis,and the axis keeps perpendicular with pinacoid-view.Thus the direction of the cross-section is unrelated with center channel curve in plane-view.Traditionally,it is assumed that the cross-section is perpendicular to the center-channel curve.This is not the fact.It is considered that the major cause is resulted from the disagreement among plane view,dimension of cross-section and actual wood former of double channel impeller.A more reasonable design process is proposed.
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