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Technical Briefs

Head Curve of Noncavitating Inducer

[+] Author and Article Information
Wen-Guang Li

Department of Fluid Machinery, Lanzhou University of Technology, 287 Langongping Road, Lanzhou, 730050 Gansu, Chinaliwg40@sina.com

J. Fluids Eng 133(2), 024501 (Feb 23, 2011) (8 pages) doi:10.1115/1.4003504 History: Received February 22, 2010; Revised January 23, 2011; Published February 23, 2011; Online February 23, 2011

In the inducer hydraulic design, one significantly important task is to estimate its noncavtating head; however, there is not a matured and reliable method for this presently. In this paper, a method was made for predicting the inducer head curve. The method was based on a singularity method and a hydraulic loss model with a variable correction factor. The blade thickness blockage effect on the flow was taken into account. The method was validated with the experimental data of the existing 17 inducers found in references. Moreover, the curves showing the relation of the correction factor with the mean blade angle at tip for two- and three-bladed inducers were established. The method can achieve a very good agreement with experimental observations. Furthermore, the flow field calculated by the method may be instructive to the engineers of inducer hydraulic design.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Inducer outline (a), meridian view, (b) and development plane of a cylindrical stream surface (c)

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Figure 2

Cross section through blade zone of inducer

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Figure 3

Axial velocities on various stream surfaces and sheets

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Figure 4

Hydraulic loss coefficient against angle of attack for various inducers, symbol for experimental data in Ref. 1, line for curve fitting

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Figure 5

Predicted and measured head coefficient curves, Exp for measurement, Kita’s for method in Ref. 1, SM for the approach proposed in the paper, and (a)–(q) for inducers 1–17

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Figure 6

Correlation of c with the mean blade angle for the inducers with the numbers of blades of 2 and 3, respectively, and R is the correlation coefficient

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Figure 7

Head coefficient of inducer 3 in terms of flow coefficient obtain with different methods. Euler-slip for Euler equation plus slip correction, REE-slip for radial REE plus slip correction, REE-loss for REE plus subtracted hydraulic loss, and SM for the author’s method.

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Figure 8

Theoretical head variation over blade on five stream surfaces in inducers 15 (a) and 16 (b) at flow coefficient ϕ=0.128 (design duty)

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Figure 9

Pressure contour and relative velocity vector on the tip stream surface in inducers 15 ((a) and (b)) and 16 ((c) and (d)) at a flow coefficient ϕ=0.128 (design duty)

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