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Correction method of fish-friendly pump blade impact model based on CFD

An impact model and blade technology, which is applied in the field of correction of fish-friendly pump blade impact models, can solve problems such as large blade impact probability errors, and achieve the effect of reducing prediction errors and accurate prediction values.

Pending Publication Date: 2021-07-23
JIANGSU UNIV
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Problems solved by technology

[0004] Aiming at the problem that the blade impact model has a large error in predicting the blade impact probability of fish passing through the impeller of the axial flow pump, the traditional blade impact model is corrected

Method used

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  • Correction method of fish-friendly pump blade impact model based on CFD
  • Correction method of fish-friendly pump blade impact model based on CFD
  • Correction method of fish-friendly pump blade impact model based on CFD

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Embodiment Construction

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0049] The correction of the blade impact model based on CFD is mainly improved by combining the effect of the pressure on the fish along the radial direction of the impeller inside the impeller with the traditional blade impact model to obtain a modified blade impact model. The specific operation steps are as follows:

[0050] (1) Three-dimensional modeling of the water body of each component of the axial flow pump;

[0051] (2) mesh each hydraulic component;

[0052] (3) Numerical simulation with CFD;

[0053] (4) Extract the...

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Abstract

The invention discloses a correction method of a fish-friendly pump blade impact model based on CFD, and relates to the field of fluid machinery, CFD numerical simulation is used to obtain a differential pressure gradient in an axial flow pump impeller along a circumferential tangential direction, and then an average differential pressure gradient Pave in the axial flow pump impeller is obtained; and force acting on the surface of the fish body is obtained according to the average pressure difference gradient Pave and the side area of the fish body, then the acceleration of the fish body is obtained according to the mass of the fish body, and finally the critical time when the fish body is impacted by the blade in the process of entering the axial flow pump impeller blade inlet overflowing section is obtained, so that a traditional blade impact model is corrected. According to the method, the average pressure difference in the impeller in the circumferential direction is obtained based on the CFD numerical simulation result, the blade impact probability formula is corrected according to the influence of the pressure difference on the fish body, the prediction error of the blade impact probability can be effectively reduced through the correction, and the blade impact probability and the blade impact death rate prediction value are more accurate.

Description

technical field [0001] The invention relates to the technical fields of ecological environment protection and hydraulic machinery design, in particular to a correction method of a CFD-based blade impact model of a fish-friendly pump. Background technique [0002] Axial flow pumps are widely used in water diversion projects with large flow and low head. When the axial flow pump is in operation, the fish will be impacted by the blades along with the water flow through the axial flow pump, and this impact may cause damage or even death to the fish. Accurately predicting the impact probability of blades can not only accurately evaluate the fish-friendliness of the impeller but also save a lot of experimental costs. Therefore, accurate prediction of the impact probability is not only related to the maintenance of the national water environment and the protection of endangered aquatic animals, but also to the ecology of water conservancy projects in my country. The rapid developme...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06T17/00G06F111/10G06F119/14
CPCG06F30/28G06T17/00G06F2111/10G06F2119/14
Inventor 张帆祝路峰袁寿其陈轲许正萱石小涛
Owner JIANGSU UNIV
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