Method for acquiring load distribution curve of blade of double-suction centrifugal pump

Abstract

The invention relates to a method for acquiring the load distribution curve of a blade of a double-suction centrifugal pump. The method comprises the following steps: working out the specific speed and drawing the axial projection drawing of the blade according to performance parameters of the double-suction centrifugal pump, working out the key parameters of load distribution curves of a front cover plate flow line and a rear cover plate flow line of the double-suction centrifugal pump, drawing the load distribution curves of the front cover plate flow line and the rear cover plate flow line, thickening the blade of the double-suction centrifugal pump according to the size, the working capacity and the casting level of the blade, working out the flow lines of a front cover plate and a rear cover plate according to the load distribution curves of the front cover plate flow line and the rear cover plate flow line and the thickening value, and performing numerical prediction to the efficiency and the inside fluid field of a conventional double-suction centrifugal pump model and a double-suction centrifugal pump model acquired through the method provided by the invention by adopting an analogue simulation method. The blade of the double-suction centrifugal pump, acquired through the invention, has the advantages that the surface pressure variation is uniform, a secondary flow in the outlet area of the blade is reduced remarkably, and the range of a high-efficiency area is broadened.

Description

technical field [0001] The invention relates to a blade hydraulic design method, in particular to a method for obtaining the load distribution curve of a double-suction centrifugal pump blade. Background technique [0002] The blade hydraulic design method based on the three-dimensional inverse problem has become the main method of centrifugal pump blade design, and the key problem is the determination of the blade load distribution curve. The specific speed range of the double-suction centrifugal pump widely used in engineering is 130-180. The secondary flow phenomenon often exists in the blade outlet area of ​​the double-suction centrifugal pump, which reduces the efficiency of the double-suction centrifugal pump and causes vibration. The shape of the blade load distribution curve of the double-suction centrifugal pump has an important influence on the hydraulic performance of the double-suction centrifugal pump, and the curve is often represented by a three-segment curve,...

AI Technical Summary

Problems solved by technology

But so far, how to give a reasonable double-suction centrifugal pump blade load distribution curve to weaken the secondary flow in the blade outlet area, so as to broaden the high-efficiency zone, has not yet had any results and methods for reference.

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