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Designing method of fish-friendly axial flow pump based on fish survival rate prediction

A design method and technology of an axial flow pump, which are applied to the components, pumps, and pump elements of a pumping device for elastic fluids, can solve problems such as the inability to solve ecological problems of improving the survival rate of fish, and achieve the survival rate of fish. Increased, higher lift, lower impact fatality effects

Inactive Publication Date: 2016-06-01
JIANGSU UNIV
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Problems solved by technology

Therefore, existing design methods do not address the important ecological issue of increasing fish survival

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  • Designing method of fish-friendly axial flow pump based on fish survival rate prediction
  • Designing method of fish-friendly axial flow pump based on fish survival rate prediction
  • Designing method of fish-friendly axial flow pump based on fish survival rate prediction

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0042] Fish Survival Rate Prediction Mathematical Model by Figure 1 to Figure 5 illustrate. figure 1 A side view of a standard axial flow pump impeller, figure 2It is the front view of the standard axial flow pump impeller, and the blades (3) are unfolded according to the plane, such as image 3 shown. Considering the fish as a one-dimensional linear rigid object with no subjective movement and no relative slippage with the liquid flow, the time for the fish to pass through the flow section (5) at the leading edge of the blade is t fish , the time required for the impeller to rotate one blade pitch is t blade , the ratio of the two can get the blade leading edge impact probability P’ strike . Among the fish hit by the leading edge (2) of the blade, some fish will die, the ratio f strike and impact velocity v and fish length L fish It ...

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Abstract

The invention provides a designing method of a fish-friendly axial flow pump based on fish survival rate prediction. A relation between a pump design parameter and the fish passing survival rate is predicted by adopting a mathematical model, and thus a fish-friendly design of an axial flow pump is guided. The mathematical model is mainly composed of the blade leading edge impact probability and the impact death rate; the impact probability is a ratio of the time that fishes pass through the cross section of passage of the blade leading edge and the time needed by an impeller rotating around a blade pitch; the impact death rate is relevant to the impact velocity, the fish length and the thickness of the blade leading edge; and the impact velocity adoptsa velocity component of a vertical leading edge. The fish-friendly axial flow pump design comprises the following steps: lowering the blade leading edge impact probability by adopting two blade impellers, lowering the impact death rate by adopting the blade leading edge with linear sweepforward protraction, and ensuring good hydraulic performance by virtue of airfoil parameter design. According to the designing method, a fish survival rate prediction model is high in goodness of fit to an experiment value, and the fish-friendly axial flow pump designed by guidance can greatly lower the fish death rate.

Description

technical field [0001] The invention relates to the technical field of hydraulic machinery, in particular to a design method of a fish-friendly axial flow pump based on fish survival rate prediction, which is suitable for the design of large and medium-sized axial flow pumps through which various types of fish pass. Background technique [0002] Pumping stations are widely used in flood control and drainage as well as agricultural irrigation. In many domestic coastal cities along rivers and low-lying countries in Europe, the amount of pumping stations is very large. But a negative impact is that fish stocks in rivers and oceans will suffer inevitable damage and death when passing through the pumping station, which will affect the migration and migration of fish. As early as 2000, the European Parliament issued a directive to protect fish habitats, including providing unimpeded migration for fish. The EU Water Framework Directive also emphasized the importance of transforming...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/18
CPCF04D29/181
Inventor 潘强施卫东张德胜
Owner JIANGSU UNIV
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