A Design Method of Bidirectional Axial Flow Pump Impeller Based on Inclined-V Symmetrical Airfoil

A technology of airfoil design and design method, which is applied to components, design optimization/simulation, pumps, etc. of pumping devices for elastic fluids, and can solve problems such as poor flow around, poor cavitation performance, and blade slippage. , to achieve the effect of clear design principle

Active Publication Date: 2019-03-22
YANGZHOU UNIV
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Problems solved by technology

[0004] Aiming at the deficiencies of existing bidirectional axial flow pump airfoils such as poor flow around, serious blade shedding, and poor cavitation performance, the present invention proposes a design method for a bidirectional axial flow pump impeller based on oblique V symmetrical airfoils, which can take into account reverse It is suitable for the operation of low head pumping stations, and the energy performance and cavitation performance can be further improved

Method used

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  • A Design Method of Bidirectional Axial Flow Pump Impeller Based on Inclined-V Symmetrical Airfoil
  • A Design Method of Bidirectional Axial Flow Pump Impeller Based on Inclined-V Symmetrical Airfoil
  • A Design Method of Bidirectional Axial Flow Pump Impeller Based on Inclined-V Symmetrical Airfoil

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Embodiment Construction

[0049] The present invention will be further described below in conjunction with accompanying drawing:

[0050] like Figure 1-8 As shown, a design method of bidirectional axial flow pump impeller based on oblique V symmetrical airfoil, figure 1 L is the chord length of the airfoil; F is the maximum camber of the airfoil; R is the radius of the arc shape; figure 2 Where θ is the central angle of the airfoil bone line, h is the maximum camber of the airfoil, equal to figure 1 F in; l is the chord length of the airfoil bone line, l=L / 2; β 1 , β 2 is the airfoil bone line entry and exit angle; β is the airfoil placement angle; H 2 is the height of the airfoil bone line; t is the grid pitch; γ is the curvature angle of the airfoil bone line.

[0051] According to the arc blade, the relationship between the angles can be known:

[0052] β=β 1 +γ (1)

[0053] β=β 2 -γ (2)

[0054] γ=θ / 2 (3)

[0055] β=(β 1 +β 2 ) / twenty four)

[0056] beta 2 -β 1 = θ (5)

[0057] A...

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Abstract

A two-way axial flow pump impeller based on oblique V symmetrical airfoil and its design method, belonging to the technical field of water conservancy engineering, the impeller is composed of blades and a hub, the diameter of the rim of the impeller is 300 mm, the ratio of the hub to the hub is 0.4667, and the number of blades is 4 , the blades are evenly distributed in the circumferential direction of the hub, the blade airfoil is an oblique V symmetrical airfoil, the center line of the unilateral airfoil is oblique V shape, the maximum thickness of the hub side airfoil is 12mm, and the maximum thickness of the rim side airfoil is 6mm, The maximum thickness of the middle airfoil section changes linearly; the design method of the impeller includes step A: bidirectional axial flow pump airfoil design; step B: bidirectional axial flow pump impeller design. The optimum point of cavitation performance of the bidirectional axial flow pump with oblique V symmetrical airfoil design adopted in the present invention is close to the point of zero-lift operating condition, and the optimum point of cavitation performance of conventional one-way pumps is close to the point of high efficiency. At the high-efficiency point, the cavitation performance of the two-way pump with inclined V airfoil reaches the level of the one-way pump.

Description

technical field [0001] The invention belongs to the technical field of water conservancy engineering, and relates to a design method of an axial flow pump impeller, in particular to a design method of a bidirectional axial flow pump impeller based on an oblique V symmetrical airfoil. Background technique [0002] Most of the pumping station projects on the east route of the South-to-North Water Diversion Project use axial flow pumps due to their low head. Many of these pumping station projects need to take into account the drainage requirements while pumping water, so as to realize the reverse pumping function of the pumping station. The traditional one-way pump is used for reverse pumping, the impeller is in the reverse arch state, the energy performance and cavitation performance of reverse operation are greatly reduced, and the severe shedding phenomenon of the impeller and guide vane blades causes severe cavitation, vibration and noise, threatening The safe and stable o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/18F04D29/66G06F17/50
CPCF04D29/181F04D29/669G06F30/17G06F30/20
Inventor 汤方平石丽建杨帆谢荣盛谢传流张文鹏
Owner YANGZHOU UNIV
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