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Research Papers

A New Streamline Curvature Throughflow Method for Radial Turbomachinery

[+] Author and Article Information
Michael Casey

ITSM-Institute of Thermal Turbomachinery and Machinery Laboratory, Universität Stuttgart, Pfaffenwaldring 6, D-70569 Stuttgart, Germanymichael.casey@itsm.uni-stuttgart.de

Chris Robinson

 PCA Engineers Limited, Studio 2, Deepdale Enterprise Park, Deepdale Lane, Nettleham, Lincoln LN2 2LL, UKchris.robinson@pcaeng.co.uk

J. Turbomach 132(3), 031021 (Apr 07, 2010) (10 pages) doi:10.1115/1.3151601 History: Received August 19, 2008; Revised February 04, 2009; Published April 07, 2010; Online April 07, 2010

This paper describes a newly developed streamline curvature throughflow method for the analysis of radial or mixed flow machines. The code includes curved walls, curved leading and trailing edges, and internal blade row calculating stations. A general method of specifying the empirical data provides separate treatment of blockage, losses, and deviation. Incompressible and compressible fluids are allowed, including real gases and supersonic relative flow in blade rows. The paper describes some new aspects of the code. In particular, a relatively simple numerical model for spanwise mixing is derived; the calculation method for prescribed pressure ratio in compressor blade rows is described; and the method used to redistribute the flow across the span due to choking is given. Examples are given of the use and validation of the code for many types of radial turbomachinery, and these show that it is an excellent tool for preliminary design.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Industrial radial compressor stage showing streamlines and calculating stations and the meridional velocity distribution

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Figure 2

Suction and pressure surface static pressure distribution along the mean meridional streamline of a radial impeller calculated with 3D CFD (CFX ) and with throughflow

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Figure 3

Mixing factor model proposed by Denton and Hirsch (21)

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Figure 4

The effect of spanwise mixing on the temperature stratification in a refrigeration impeller with a cold sidestream. Left: no mixing, middle: mixing (Eq. 5), and right: 3D CFD.

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Figure 5

The effect of the choking model on the flow and incidence distribution at inlet to a choked compressor

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Figure 6

Comparison of the meridional flow of a mixed flow pump compared with a 3D CFD calculation (ANSYS CFX )

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Figure 7

Comparison of the meridional flowfield of a mixed flow turbine compared with a 3D CFD calculation (ANSYS CFX )

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