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A numerical prediction method for tip clearance cavitation of axial flow pump impeller

A blade tip clearance and numerical prediction technology, applied in CAD numerical modeling, image data processing, electrical digital data processing, etc., can solve the problem of low numerical prediction accuracy of vortex cavitation, achieve important theoretical value and engineering practical significance, The effect of improving credibility and clarifying principles

Pending Publication Date: 2019-01-15
YANGZHOU UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to propose an axial flow pump for the current large axial flow pump station and axial flow pumps used in the market, the vortex in the blade tip clearance and the vortex cavitation phenomenon caused by it, and the numerical prediction accuracy of vortex cavitation is low. The numerical prediction method of impeller blade tip clearance cavitation can consider the influence of local vortex motion on cavitation flow, and improve the reliability of numerical prediction of axial flow pump impeller blade tip clearance cavitation, which has important theoretical value and engineering practical significance

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  • A numerical prediction method for tip clearance cavitation of axial flow pump impeller
  • A numerical prediction method for tip clearance cavitation of axial flow pump impeller
  • A numerical prediction method for tip clearance cavitation of axial flow pump impeller

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0029] A numerical prediction method for the cavitation of the impeller tip clearance of an axial flow pump, the specific process is as follows figure 1 As shown, it is mainly realized by the following steps:

[0030] A. Establishment of the geometric model of the internal flow channel of the axial flow pump

[0031] According to the geometric parameters of an axial flow pump, the three-dimensional modeling software Unigraphics NX is used to establish the geometric model of the internal flow channel of the axial flow pump, including the inlet flow channel, impeller flow channel, guide vane flow channel and water outlet flow channel; In the geometric model of the impeller, the width of the impeller tip clearance is 1.6 thousandths of the diameter of the runner.

[0032] B. Mesh division of three-dimensional flow domain of axial flow pump

[0033] Import the...

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Abstract

The invention discloses a numerical prediction method for impeller tip clearance cavitation of an axial flow pump, belonging to the technical field of impeller machinery simulation. It includes the establishment of the internal flow channel of the axial flow pump and the meshing of its three-dimensional watershed, the construction of the numerical calculation model of the clearance cavitation flow, the numerical calculation of the steady cavitation flow field inside the axial flow pump, the solution of the unsteady cavitation flow field inside the axial flow pump, and the numerical predictionand examination of the clearance cavitation region of the impeller tip of the axial flow pump. The invention considers the influence of the local vortex motion of the blade tip clearance on the cavitation flow, by adding the flow parameters reflecting the local rotational motion characteristics of the flow field into the cavitation model, the credibility of the numerical prediction of the cavitation of the impeller tip clearance of the axial flow pump is improved, and the cavitation region of the impeller tip clearance of the axial flow pump can be predicted accurately, which has important theoretical value and engineering practical significance.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery simulation, and in particular relates to a numerical prediction method for cavitation in the vane tip clearance of an axial flow pump impeller. Background technique [0002] In the impeller channel of the axial flow pump, there is a gap between the rotating blade and the pump casing at the outer edge of the blade tip. The gap between the impeller and the tip of the impeller is the concentrated area of ​​cavitation damage in the axial flow pump. Cavitation in the tip gap is the cause of failure of the axial flow pump unit. important factor. Constrained by the geometric scale and complex flow field of the impeller blade tip of the axial flow pump, the experimental test of the cavitation flow field in the gap is expensive, difficult, and limited in data. In contrast, the numerical simulation technology based on computational fluid dynamics has the advantages of obvious. The flow field in...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06T17/20
CPCG06T17/20G06F2111/10G06F30/23
Inventor 郭嫱黄先北仇宝云
Owner YANGZHOU UNIV
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