Designing method of three operating points of impeller of high-specific-speed axial flow pump

Abstract

The invention provides a designing method of three operating points of an impeller of a high-specific-speed axial flow pump. The impeller is suitable for the occasions such as farm irrigation, power plant cooling circulation and urban water supply. The designing method is characterized in that when the impeller of the axial flow pump is designed, geometrical parameters of the impeller and performance parameters of the design operating point, the small-flow operating point and the high-flow operating point are linked through relational expressions to enable all the performance parameters of the three operating points to meet design requirements, through the design of the performance parameters of the three operating points, control over and adjustment of the characteristics of the performance curve of the pump are realized, and therefore the axial flow pump performance curve meeting the design requirements can be obtained. The high-specific-speed axial flow pump designed through the method can meet the design performance requirements of a plurality of operating points, and further has the advantages of being high in efficiency, wide in high-efficiency area and stable in running.

Description

technical field [0001] The patent of the present invention relates to a design method for three operating points of an impeller of a high specific speed axial flow pump, specifically, a design method for an impeller of a high-efficiency axial flow pump suitable for meeting the design requirements of multiple operating points. Background technique [0002] At present, the impeller design of axial flow pumps generally adopts the single operating point design method, and the determination and calculation of the impeller geometric parameters are based on the performance parameters of the design operating point. With the increase of the specific speed of the axial flow pump, its performance curve presents a typical saddle-shaped change, and the head curve of the axial flow pump drops first and then rises, thus forming an unstable operating condition. At the same time, under the condition of large flow rate, the head and efficiency curve of the axial flow pump are prone to signifi...

AI Technical Summary

Problems solved by technology

The existing patented technology still has the following two problems: 1. The existing related patented technology is all about the centrifugal pump impeller design method with radial blade structure, and there is no multi-working condition suitable for the high specific speed axial flow pump impeller. 2. The existing technology does not point out how many operating point performance parameters are the most suitable as design parameters, but only proposes a rough range, and too many or too few design parameters are likely to cause failure of the design process and inaccurate design results

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