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Experimental study of a small partial admission axial turbine with low aspect ratio blade

Varma, AK and Soundranayagam, S (2014) Experimental study of a small partial admission axial turbine with low aspect ratio blade. In: PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART G-JOURNAL OF AEROSPACE ENGINEERING, 228 (1). pp. 20-34.

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Official URL: http://dx.doi.org/10.1177/0954410012466779

Abstract

Experimental study of a small partial admission axial turbine with low aspect ratio blade has been done. Tests were also performed with full admission stator replacing the partial one for the same rotor to assess the losses occurring due to partial admission. Further tests were conducted with stator admission area split into two and three sectors to study the effects of multiple admission sectors. The method of Ainley and Mathieson with suitable correction for aspect ratio in secondary losses, as proposed by Kacker and Okapuu, gives a good estimate of the efficiency. Estimates of partial admission losses are made and compared with experimentally observed values. The Suter and Traupel correlations for partial admission losses yielded reasonably accurate estimates of efficiency even for small turbines though limited to the region of design u/c(is). Stenning's original concept of expansion losses in a single sector is extended to include multiple sectors of opening. The computed efficiency debit due to each additional sector opened is compared with test values. The agreement is observed to be good. This verified Stenning's original concept of expansion losses. When the expression developed on this extended concept is modified by a correction factor, the prediction of partial admission efficiencies is nearly as good as that of Suter and Traupel. Further, performance benefits accrue if the turbine is configured with increased aspect ratio at the expense of reduced partial admission.

Item Type: Journal Article
Additional Information: copyright for this article belongs to SAGE PUBLICATIONS LTD, ENGLAND
Keywords: Low aspect ratio; partial admission; multiple sector
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 20 Jan 2014 08:25
Last Modified: 20 Jan 2014 08:25
URI: http://eprints.iisc.ac.in/id/eprint/48201

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