Speed moment distribution for restraining secondary flow of suction surface of water pump impeller blade

Abstract

The invention provides velocity moment distribution for suppressing secondary flow of a suction surface of a water pump impeller blade, which is characterized by comprising the following steps of: 1, determining velocity moment distribution along an outlet edge of the blade, and performing linear interpolation and uniform transition on a middle position; 2, determining velocity moment distribution of each section along a meridian streamline; each section adopts velocity moment distribution with different characteristics; the velocity moments of the rest sections are distributed on the basis of the sections for linear interpolation and uniform transition; the generality of velocity moment distribution of each section is that first-order derivatives of an inlet and an outlet are 0; 3, solving the impeller blade bone line equation to obtain the actual shape of the blade, and obtaining a blade bone line equation; therefore, the designed impeller blade is obtained. The invention has the advantages that the impeller blade designed and completed according to the velocity moment distribution provided by the invention can effectively control the secondary flow of the suction surface of the water pump blade, flow separation is avoided, and vibration and noise are reduced while the hydrodynamic performance is improved.

Description

technical field [0001] The application relates to suppressing the distribution of velocity moment of the secondary flow on the suction surface of the blade of the water pump impeller, and belongs to the technical field of the blade of the water pump impeller. Background technique [0002] The secondary flow on the suction surface of the impeller blade is a common flow phenomenon in the water pump. It is characterized by the flow of the secondary flow perpendicular to the main flow. The reason is that the pressure and velocity of the pump flow channel are not uniform. The difference in pressure makes the fluid particle under pressure. , the force points in the direction of the pressure gradient. In the mainstream area, the fluid velocity is high and can overcome the pressure; however, the pressure in the boundary layer on the blade surface is similar to the mainstream, but the velocity is much lower, and the inertial force is not enough to overcome the pressure, so the fluid ...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in this application is how to reduce the adverse effect of the secondary flow on the suction surface of the impeller blade

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