This paper presents an experimental and computational study of the effect of inlet swirl on the efficiency of a transonic turbine stage. The efficiency penalty is approximately 1%, but it is argued that this could be recovered by correct design. There are attendant changes in capacity, work function, and stage total-to-total pressure ratio, which are discussed in detail. Experiments were performed using the unshrouded MT1 high-pressure turbine installed in the Oxford Turbine Research Facility (OTRF) (formerly at QinetiQ Farnborough): an engine scale, short duration, rotating transonic facility, in which M, Re, , and are matched to engine conditions. The research was conducted under the EU Turbine Aero-Thermal External Flows (TATEF II) program. Turbine efficiency was experimentally determined to within bias and precision uncertainties of approximately ±1.4% and ±0.2%, respectively, to 95% confidence. The stage mass flow rate was metered upstream of the turbine nozzle, and the turbine power was measured directly using an accurate strain-gauge based torque measurement system. The turbine efficiency was measured experimentally for a condition with uniform inlet flow and a condition with pronounced inlet swirl. Full stage computational fluid dynamics (CFD) was performed using the Rolls-Royce Hydra solver. Steady and unsteady solutions were conducted for both the uniform inlet baseline case and a case with inlet swirl. The simulations are largely in agreement with the experimental results. A discussion of discrepancies is given.
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University of Oxford,
Parks Road,
Rolls-Royce plc,
Moor Lane,
Derby DE24 8BJ,
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Parks Road,
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January 2014
Research-Article
Effect of Combustor Swirl on Transonic High Pressure Turbine Efficiency
Paul F. Beard,
University of Oxford,
Parks Road,
Paul F. Beard
Department of Engineering Science
,University of Oxford,
Parks Road,
Oxford OX1 3PJ
, UK
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Andy D. Smith,
Rolls-Royce plc,
Moor Lane,
Derby DE24 8BJ,
Andy D. Smith
Turbine Systems
,Rolls-Royce plc,
Moor Lane,
PCF-1, P.O. Box 31
,Derby DE24 8BJ,
UK
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Thomas Povey
University of Oxford,
Parks Road,
Thomas Povey
Department of Engineering Science
,University of Oxford,
Parks Road,
Oxford OX1 3PJ
, UK
Search for other works by this author on:
Paul F. Beard
Department of Engineering Science
,University of Oxford,
Parks Road,
Oxford OX1 3PJ
, UK
Andy D. Smith
Turbine Systems
,Rolls-Royce plc,
Moor Lane,
PCF-1, P.O. Box 31
,Derby DE24 8BJ,
UK
Thomas Povey
Department of Engineering Science
,University of Oxford,
Parks Road,
Oxford OX1 3PJ
, UK
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received June 8, 2012; final manuscript received March 25, 2013; published online September 20, 2013. Assoc. Editor: Kenichiro Takeishi.
J. Turbomach. Jan 2014, 136(1): 011002 (12 pages)
Published Online: September 20, 2013
Article history
Received:
June 8, 2012
Revision Received:
March 25, 2013
Citation
Beard, P. F., Smith, A. D., and Povey, T. (September 20, 2013). "Effect of Combustor Swirl on Transonic High Pressure Turbine Efficiency." ASME. J. Turbomach. January 2014; 136(1): 011002. https://doi.org/10.1115/1.4024841
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