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CFD-based prediction method of centrifugal pump cavitation performance

A prediction method and centrifugal pump technology, which are applied to the components, pumps, and pump components of the pumping device for elastic fluids, can solve the problems of long simulation time and difficulty in ensuring the simulation accuracy, so as to save the number of simulations and save Simulate the effect of time

Active Publication Date: 2015-04-08
JIANGSU UNIV
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Problems solved by technology

[0005] There is a common problem in the prediction of NPSHr in the above existing methods, that is, the simulation time is long, and it is difficult to guarantee the accuracy of the simulation

Method used

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  • CFD-based prediction method of centrifugal pump cavitation performance
  • CFD-based prediction method of centrifugal pump cavitation performance

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Embodiment Construction

[0045] The purpose of the present invention is to use the CFD cavitation model to quickly predict the value of centrifugal pump NPSHr, this method is specifically carried out on the CFD software CFX, specifically as follows:

[0046] step one:

[0047] Purpose: Under the condition of given mass flow rate M*, when the pump is running normally, use CFX software to simulate and calculate the head H(0). Set the boundary conditions: the inlet is set to a fixed total pressure: PT in (0)=PT in *

[0048] The outlet is set to a fixed mass flow rate: M out (0)=M*

[0049] After the simulation calculation in CFX, the post-processing output is obtained: total outlet pressure: PT out (0),

[0050] Export static pressure: PS out (0),

[0051] Then the pump head and dynamic pressure can be obtained according to the calculation: head H(0)=PT out (0)-PT in (0),

[0052] Dynamic pressure DH (0) = PT out (0)-PS out (0)

[0053] Step two:

[0054] Objective: To obtain the full-loa...

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Abstract

The invention provides a CFD-based prediction method of a centrifugal pump cavitation performance and relates to a method for predicting centrifugal pump net positive suction head required (NPSHr) by a CFD cavitation model. The method mainly includes the following steps that boundary conditions in CFX software are set as inlet fixed total pressure and outlet fixed mass flow rate and rapid numerical simulation calculation is performed to estimate pump lift; under novel boundary conditions, the pump lift is calculated again in the CFX software; in the CFX software, the boundary conditions are inlet fixed mass flow rate and outlet fixed static pressure, and simulation computation is performed to obtain a NPSHr estimated value that is close to a true value; the boundary conditions are set as inlet fixed mass flow rate and outlet fixed static pressure, a point that is quite close to 3% reduction of lift is obtained by simulation computation in the CFX software, and an obtained NPSHr value is quite close to the true value; if a calculated result in the last step is in an accuracy range, the process is finished, and otherwise, the content of the last step is repeated. The CFD-based prediction method of the centrifugal pump cavitation performance is a predictable and controllable simulation method, and simulation times and time can be saved.

Description

technical field [0001] The invention relates to the field of cavitation prediction of centrifugal pumps, in particular to a method for predicting cavitation performance of centrifugal pumps based on CFD. Background technique [0002] The pump NPSH is one of the important parameters to characterize the cavitation performance of the pump, and it is of great significance in practice to calculate the geometric suction height of the pump device and determine the installation elevation of the pump. The quality of the pump cavitation performance and the correctness of the pump cavitation test method not only affect the construction investment and safe operation of the pump station, but also affect the economic and social benefits of the pump station construction. In the international bidding competition, the size of the pump NPSH directly affects the evaluation price and the success of the bidding. When the inlet pressure of the pump drops to a certain value, the cavitation area a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCF04D15/0088F04D29/669F05D2260/81F05D2260/821
Inventor 裴吉陈佳王文杰袁寿其袁建平骆寅
Owner JIANGSU UNIV
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