The problem of axial flow pump designed by lift method

Axial lift design law pump blade design is semi-theoretical semi-empirical method, at present there are many problems, for two main reasons:

1 There is no single wing characteristic data, axial flow pump impeller blade is a group of cascades, only by empirical correction, the error is too large.

2 The characteristics of a single wing are measured in a wind tunnel test. There is a big difference between air flow and water flow.

3 aerodynamic airfoil, in order to meet the changes in the flow of imported parts of the smooth and fat, not suitable for use in axial flow pump blades above.

4 calculated by lift method exit angle of attack, the hub side is large, the more on the edge of the smaller, increasing the distortion of the blade, affecting the efficiency of the pump.

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