Effect of aggressive inlet swirl on heat transfer and aerodynamics in an unshrouded transonic HP turbine

Imran Qureshi*, Arrigo Beretta, Kam Chana, Thomas Povey

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Citations (Scopus)


Swirling flows are now widely being used in modern gas turbine combustors to improve the combustion characteristics, flame stability and reduce emissions. Residual swirl at combustor exit will affect the performance of the downstream high-pressure (HP) turbine. In order to perform a detailed investigation of the effect of swirl on a full-scale HP turbine stage, a combustor swirl simulator has been designed and commissioned in the Oxford Turbine Research Facility (OTRF), previously located at QinetiQ, Farnborough UK, as the Turbine Test Facility (TTF). The swirl simulator is capable of generating an engine-representative combustor exit swirl distributions at the turbine inlet, with yaw and pitch angles of up to +/-40 degrees. The turbine test facility is an engine scale, short duration, rotating transonic turbine facility, which simulates engine representative M, Re, Tu, non-dimensional speed and gas-to-wall temperature ratio at the turbine inlet. The test turbine is a highly loaded unshrouded design (the MT1 turbine). This paper presents time-averaged experimental heat transfer measurements performed on the rotor casing surface, and on rotor blade surface at 10%, 50% and 90% span. Time-averaged rotor casing static pressure measurements are also presented. Experimental measurements with and without inlet swirl are compared. The measurements are discussed with the aid of three-dimensional steady and unsteady CFD simulations of the turbine stage. Numerical simulations were conducted using the Rolls-Royce in-house code HYDRA, with and without inlet swirl.

Original languageEnglish
Title of host publicationProceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition.
Subtitle of host publicationVolume 5: Heat Transfer, Parts A and B
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages13
ISBN (Electronic)9780791854655
Publication statusPublished - 3 May 2012
EventASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 - Vancouver, BC, Canada
Duration: 6 Jun 201110 Jun 2011

Publication series

NameTurbo Expo: Power for Land, Sea and Air


ConferenceASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011
CityVancouver, BC


  • Aerodynamics
  • Combustor Swirl
  • Heat transfer
  • HP rotor
  • Rotor casing
  • Transonic turbine

ASJC Scopus subject areas

  • General Engineering


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