Based on a 3 D flow analysis with the jet wake model and performance prediction, an optimization model for the centrifugal pump blade profile is developed with the efficiency as the objective function and the incident angle and distribution factor of the blade angle as design variables.

Two-dimensional model,where the influence of wall boundary layers is neglected and inlet jet-wake velocity patterns are prescribed,was applied to simulate one vanless diffuser with large width-radius(ratio.

Assuming that the flow inside the vaneless diffuser was incompressible two dimensional flow,a state matrix model was established and analysis was made on the jet-wake type disturbance at the inlet of the diffuser based on published literatures.

In order to arrange the wind turbines in wind farm correctly, reduce the wake effects by all means, improve the efficiency of wind farm, and make its economic efficiency to be the best, the AV wake model of wind turbine is used to calculate the speed distribution in the wake of wind turbine and the wake effects on the capability of a wind turbine.

In this paper, a method of aerodynamic calculation and aerodynamic performance analysis for a horizontal axis wind turbine is presented using semi-rigid wake model.