Guide vane type centrifugal pump waterpower cooperation design method

Abstract

The invention discloses a guide vane type centrifugal pump waterpower cooperation design method, and the method comprises the steps of determining a geometric parameter of an impeller and a guide vane in the guide vane type centrifugal pump; determining an optimal ratio area parameter combination scheme of the ratio between a guide vane blade channel throat area and an impeller outlet effective over-current area; and establishing a cooperation relation of the geometric parameter between the impeller and the guide vane; determining an optimal equivalent diffusion degree parameter combination scheme of a single guide vane channel based on the optimal ratio area parameter combination scheme; and establishing a cooperation relation of the geometric parameter between the impeller and the guide vane. According to the invention, the ratio area principle is utilized; the coupling relation between the geometric parameter of the pump impeller and the guide vane is discussed; the impeller and the guide vane are cooperated and the parameter is optimized; and the coupling relation between the impeller and the guide vane is improved. In this way, the pump efficiency and waterpower stability can be raised; the optimal equivalent diffusion degree parameter combination scheme can be determined based on the optimal ratio area; and the pump's efficiency and the waterpower's stabilization are further improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic design of centrifugal pumps, in particular to a method for hydraulic collaborative design of guide vane centrifugal pumps. Background technique [0002] At present, based on the principle of area ratio (specific area), the research on the parameter matching relationship between the centrifugal pump impeller and the volute has become mature, but the research on the parameter matching law between the guide vane centrifugal pump impeller and the radial guide vane is still blank. State, the traditional radial guide vane design method is limited by statistical data and experience, does not consider the cooperative relationship between the pump impeller and the radial guide vane, and the degree of freedom in the value of the guide vane geometric parameters is large, it is difficult to guarantee the performance of the guide vane. In addition, since the diffusion section of the guide vane plays a major ...

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Problems solved by technology

[0002] At present, based on the principle of area ratio (specific area), the research on the parameter matching relationship between the centrifugal pump impeller and the volute has become mature, but the research on the parameter matching law between the guide vane centrifugal pump impeller and the radial guide vane is still blank. State, the traditional radial guide vane design method is limited by statistical data and experience, does not consider the cooperative relationship between the pump impeller and the radial guide vane, and the degree of freedom in the value of the guide vane geometric parameters is large, it is difficult to guarantee the performance of the guide vane

In addition, since the diffusion section of the guide vane plays a major role in changing the flow direction and recovering the pressure energy of the fluid, the degree of diffusion reflects the constraint ability of the guide vane on the fluid movement. If the guide vane diffuses too much, the fluid will be seriously separated from the blade surface, resulting in For complex flows such as backflow, secondary flow, and vortex, if the diffusion is too small, the interaction between the fluid and the guide vane blades will be enhanced, and the fluid velocity will change drastically, resulting in a large energy loss. Therefore, in the design of the guide vane centrifugal pump hydraulic synergy It is very important to choose the appropriate guide vane diffuseness when using the method, but there are few related researches on the guide vane diffuseness at home and abroad.

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