Modern lean burn combustors now employ aggressive swirlers to enhance fuel-air mixing and improve flame stability. The flow at combustor exit can therefore have high residual swirl. A good deal of research concerning the flow within the combustor is available in open literature. The impact of swirl on the aerodynamic and heat transfer characteristics of an HP turbine stage is not well understood, however. A combustor swirl simulator has been designed and commissioned in the Oxford Turbine Research Facility (OTRF), previously located at QinetiQ, Farnborough UK. The swirl simulator is capable of generating an engine-representative combustor exit swirl pattern. At the turbine inlet plane, yaw and pitch angles of over ±40 deg have been simulated. The turbine research facility used for the study is an engine scale, short duration, rotating transonic turbine, in which the nondimensional parameters for aerodynamics and heat transfer are matched to engine conditions. The research turbine was the unshrouded MT1 design. By design, the center of the vortex from the swirl simulator can be clocked to any circumferential position with respect to HP vane, and the vortex-to-vane count ratio is 1:2. For the current investigation, the clocking position was such that the vortex center was aligned with the vane leading edge (every second vane). Both the aligned vane and the adjacent vane were characterized. This paper presents measurements of HP vane surface and end wall heat transfer for the two vane positions. The results are compared with measurements conducted without swirl. The vane surface pressure distributions are also presented. The experimental measurements are compared with full-stage three-dimensional unsteady numerical predictions obtained using the Rolls Royce in-house code Hydra. The aerodynamic and heat transfer characterization presented in this paper is the first of its kind, and it is hoped to give some insight into the significant changes in the vane flow and heat transfer that occur in the current generation of low NOx combustors. The findings not only have implications for the vane aerodynamic design, but also for the cooling system design.
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University of Oxford,
Oxford, OX1 3PJ,
e-mail: imran.qureshi@rolls-royce.com
Rolls-Royce PLC, Moor Lane,
University of Oxford,
Oxford, OX1 3PJ,
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March 2013
Research-Article
HP Vane Aerodynamics and Heat Transfer in the Presence of Aggressive Inlet Swirl
Imran Qureshi,
University of Oxford,
Oxford, OX1 3PJ,
e-mail: imran.qureshi@rolls-royce.com
Imran Qureshi
1
Department of Engineering Science
,University of Oxford,
Parks Road
,Oxford, OX1 3PJ,
UK
e-mail: imran.qureshi@rolls-royce.com
1Corresponding author. Present address: Rolls-Royce PLC, PCF-2, P.O. Box 31, Derby, DE24 8BJ.
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Andy D. Smith,
Rolls-Royce PLC, Moor Lane,
Andy D. Smith
Turbine Sub-systems
,Rolls-Royce PLC, Moor Lane,
Derby, DE24 8BJ
, UK
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Thomas Povey
University of Oxford,
Oxford, OX1 3PJ,
Thomas Povey
Department of Engineering Science
,University of Oxford,
Parks Road
,Oxford, OX1 3PJ,
UK
Search for other works by this author on:
Imran Qureshi
Department of Engineering Science
,University of Oxford,
Parks Road
,Oxford, OX1 3PJ,
UK
e-mail: imran.qureshi@rolls-royce.com
Andy D. Smith
Turbine Sub-systems
,Rolls-Royce PLC, Moor Lane,
Derby, DE24 8BJ
, UK
Thomas Povey
Department of Engineering Science
,University of Oxford,
Parks Road
,Oxford, OX1 3PJ,
UK
1Corresponding author. Present address: Rolls-Royce PLC, PCF-2, P.O. Box 31, Derby, DE24 8BJ.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received October 19, 2011; final manuscript received October 26, 2011; published online November 19, 2012. Editor: David Wisler.
J. Turbomach. Mar 2013, 135(2): 021040 (13 pages)
Published Online: November 19, 2012
Article history
Received:
October 19, 2011
Revision Received:
October 26, 2011
Citation
Qureshi, I., Smith, A. D., and Povey, T. (November 19, 2012). "HP Vane Aerodynamics and Heat Transfer in the Presence of Aggressive Inlet Swirl." ASME. J. Turbomach. March 2013; 135(2): 021040. https://doi.org/10.1115/1.4006610
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