A Practical Combined Computation Method of Mean Through-Flow for 3D Inverse Design of Hydraulic Turbomachinery Blades

[+] Author and Article Information
Guoyi Peng

Department of Mechanical Systems Engineering, Toyama Prefectural University, Toyama, 939-0398, Japanpeng@pu-toyama.ac.jp

J. Fluids Eng 127(6), 1183-1190 (Jul 01, 2005) (8 pages) doi:10.1115/1.2062787 History: Received January 23, 2004; Revised July 01, 2005

A practical combined computation method of the circumferentially averaged mean through-flow is presented for 3D inverse computations of hydraulic turbomachinery blades to consider the influence of interrelated hydraulic components. A comprehensive computation domain including the runner blades and related components is adopted and the mean flow is calculated altogether by solving a set of rotational flow governing equations simultaneously. The method has been applied to the case of Kaplan turbine. Computational results were compared to experimental data and their agreement was confirmed. Numerical investigation indicates that the mean flow is dependent on the configuration of guide vanes and the effect of runner blades reaches to the far upstream. The importance of properly taking account of the effect of blade geometry and the influence of interrelated hydraulic components is demonstrated.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Curvilinear coordinates relative to hydraulic blades

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Figure 2

Schematic diagram of computation configuration and computational grid

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Figure 3

Distribution of meridional streamline in cases with and without runner blades

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Figure 4

Comparison of computational results by different meshes and experimental data: distribution of circumferentially averaged mean velocity in the radial direction: (a) at section 1-1 and (b) at section 2-2

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Figure 5

Blade geometry on cylindrical sections

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Figure 6

Mean swirl velocity distribution in the blade region

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Figure 10

Swirl velocity distribution along the trailing edge of the guide vane

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Figure 9

Meridional velocity distribution along blade leading and trailing edges

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Figure 8

Meridional velocity distribution at sections 1-1 and 2-2

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Figure 7

Distribution of meridional velocity along streamlines in cases with and without the runner blades: (a) in the case with runner blades and (b) in the case without runner blades



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