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Technical Briefs

NPSHr Optimization of Axial-Flow Pumps

[+] Author and Article Information
Wen-Guang Li

Department of Fluid Machinery, Lanzhou University of Technology, 287 Langongping Road, 730050 Lanzhou, P.R.C.liwg40@sina.com

J. Fluids Eng 130(7), 074504 (Jul 22, 2008) (4 pages) doi:10.1115/1.2948368 History: Received August 20, 2007; Revised April 03, 2008; Published July 22, 2008

The two-step method for optimizing net positive suction head required (NPSHr) of axial-flow pumps is proposed in this paper. First, the NPSHr at the impeller tip is optimized with impeller diameter based on experimental data of 2D cascades in available wind tunnels. Then, it is optimized again with the velocity moment at the impeller outlet, which is expressed in terms of two parameters. The blade geometry is generated and flow details are clarified by using the radial equilibrium equation, actuator disk theory, and 2D vortex element method in the optimizing process. The NPSHr response surface has been established in terms of these two parameters. The results illustrate that the second optimization allows NPSHr to be reduced by 37.5% compared to the first optimization. Therefore, this two-step method is effective and expects to be applied in the axial-flow pump impeller blade design. The simulations of 3D turbulent flow with various cavitation models and related confirming experiments are going to be done in the axial-flow impellers designed with this method.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Velocity-moment shape function in terms of dimensionless parameter ξ

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Figure 2

Dimensionless thickness against the dimensionless chord for the two types of airfoil

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Figure 3

NPSHr versus the impeller diameter when K1=0m2∕s, 0.1m2∕s, 0.2m2∕s, ηh=0.85, σt=0.85, and ν=0.53

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Figure 4

Response surface of NPSHr as a function of the parameters f0 and f1

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Figure 5

Pressure coefficient distribution on the blade surfaces at hub, mid-span and tip stream-surfaces. The solid line is for blade pressure side, and the dashed for blade suction side.

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Figure 6

Blade 3D shape optimized and the pressure coefficient contour on blade surface

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