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TECHNICAL PAPERS

A Direct Performance Comparison of Vaned and Vaneless Stators for Radial Turbines

[+] Author and Article Information
S. W. Spence, R. S. Rosborough, D. Artt, G. McCullough

School of Mechanical & Aerospace Engineering, Queen’s University Belfast, Ashby Institute, Stranmillis Road, Belfast BT9 5AH, UK

J. Turbomach 129(1), 53-61 (Jan 11, 2006) (9 pages) doi:10.1115/1.2218518 History: Received January 22, 2005; Revised January 11, 2006

An extensive performance investigation has been conducted on a radial turbine with three different vaneless volutes and three corresponding vaned stators. Previously published comparisons have been based on turbines with unmatched flow rates, meaning that the impact of stator losses was not isolated from rotor and exit losses. Each vaned stator configuration tested in this investigation matched the flow rate of the corresponding vaneless volute to within 1%. The volutes and the vaned stators were all machined in order to achieve high quality and comparable surface finishes. At all operating conditions, the vaneless volutes were shown to deliver a significant efficiency advantage over the vaned stators. However, the vaneless volute turbines did not demonstrate any greater tolerance for off-design operating conditions than the vaned stator configurations. Full performance data are presented for the six different turbine configurations tested and a one-dimensional turbine performance model is evaluated as a means of predicting and extrapolating turbine performance.

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Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Meridional view of the turbine rotor

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Figure 2

Vaneless volute B

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Figure 4

Comparison of efficiency and mass flow rate for turbine A with vaned and vaneless stators

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Figure 5

Comparison of efficiency and mass flow rate for turbine B with vaned and vaneless stators

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Figure 6

Comparison of efficiency and mass flow rate for turbine C with vaned and vaneless stators

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Figure 7

Comparison of efficiency for vaned stator B and vaneless volute B, plotted against velocity ratio U∕C

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Figure 8

Peak efficiency envelopes for the vaned stator configurations A, B, and C

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Figure 9

Difference in vaned and vaneless stator losses for each of the turbine configurations A, B, and C

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Figure 10

Comparison of predicted and measured performance for the vaneless volute turbines at 65,000rev∕min

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Figure 11

Comparison of predicted and measured performance for the vaned stator turbines at 65,000rev∕min

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