The experimental performance evaluation of a circumferentially divided, double-entry turbocharger turbine is presented in this paper with the aim of understanding the influence of pulsating flow. By maintaining a constant speed but varying the frequency of the pulses, the influence of frequency was shown to play an important role in the performance of the turbine. A trend of decreasing cycle-averaged efficiency at lower frequencies was measured. One of the principal objectives was to assess the degree to which the unsteady performance differs from the quasi-steady assumption. In order to make the steady-unsteady comparison for a multiple entry turbine, a wide set of steady equal and unequal admission flow conditions were tested. The steady-state data was then interpolated as a function of three, nondimensional parameters in order to allow a point-by-point comparison with the instantaneous unsteady operation. As an average, the quasi-steady assumption generally underpredicted the mass flow and efficiency loss through the turbine, albeit the differences were reduced as the frequency increased. Out-of-phase pulsations produced unsteady operating orbits that corresponded to a significant steady-state, partial admission loss, and this was reflected as a drop in the quasi-steady efficiency. However, these differences between quasi-steady in-phase and out-of-phase predictions were not replicated in the measured results, suggesting that the unequal admission loss is not as significant in pulsating flow as it is in steady flow.
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e-mail: c.copeland@imperial.ac.uk
e-mail: r.botas@imperial.ac.uk
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July 2011
Research Papers
Comparison Between Steady and Unsteady Double-Entry Turbine Performance Using the Quasi-Steady Assumption
Colin D. Copeland,
Colin D. Copeland
Department of Mechanical Engineering,
e-mail: c.copeland@imperial.ac.uk
Imperial College London
, South Kensington Campus, London SW7 2AZ, UK
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Ricardo Martinez-Botas,
Ricardo Martinez-Botas
Department of Mechanical Engineering,
e-mail: r.botas@imperial.ac.uk
Imperial College London
, South Kensington Campus, London SW7 2AZ, UK
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Martin Seiler
Martin Seiler
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Colin D. Copeland
Department of Mechanical Engineering,
Imperial College London
, South Kensington Campus, London SW7 2AZ, UKe-mail: c.copeland@imperial.ac.uk
Ricardo Martinez-Botas
Department of Mechanical Engineering,
Imperial College London
, South Kensington Campus, London SW7 2AZ, UKe-mail: r.botas@imperial.ac.uk
Martin Seiler
J. Turbomach. Jul 2011, 133(3): 031001 (10 pages)
Published Online: November 11, 2010
Article history
Received:
July 21, 2009
Revised:
August 13, 2009
Online:
November 11, 2010
Published:
November 11, 2010
Citation
Copeland, C. D., Martinez-Botas, R., and Seiler, M. (November 11, 2010). "Comparison Between Steady and Unsteady Double-Entry Turbine Performance Using the Quasi-Steady Assumption." ASME. J. Turbomach. July 2011; 133(3): 031001. https://doi.org/10.1115/1.4000580
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