Effect of radial location of nozzles on heat transfer in pre-swirl cooling systems

Vinod U Kakade, Gary D Lock, Michael Wilson, J M Owen, J E Mayhew

Research output: Chapter or section in a book/report/conference proceedingChapter or section

18 Citations (SciVal)


This paper investigates heat transfer in a rotating disc system using pre-swirled cooling air from nozzles at high and low radius. The experiments were conducted over a range of rotational speeds, flow rates and pre-swirl ratios. Narrow-band thermochromic liquid crystal (TLC) was specifically calibrated for application to experiments on a disc rotating at 5000 rpm and subsequently used to measure surface temperature in a transient experiment. The TLC was viewed through the transparent polycarbonate disc using a digital video camera and strobe light synchronised to the disc frequency. The convective heat transfer coefficient, h, was subsequently calculated from the one-dimensional solution of Fourier's conduction equation for a semi-infinite wall. The analysis accounted for the exponential rise in the air temperature driving the heat transfer, and for experimental uncertainties in the measured values of h. The experimental data was supported by 'flow visualisation' determined from CFD. Two heat transfer regimes were revealed for the low-radius pre-swirl system: a viscous regime at relatively low coolant flow rates; and an inertial regime at higher flow rates. Both regimes featured regions of high heat transfer where thin, boundary layers replaced air exiting through receiver holes at high radius on the rotating disc. The heat transfer in the high radius pre-swirl system was shown to be dominated by impingement under the flow conditions tested.
Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2009
Number of pages10
ISBN (Electronic)978-0-7918-3849-5
ISBN (Print)9780791848845
Publication statusPublished - 2009
Event54th ASME Turbo Expo 2009: Power for Land, Sea, and Air - Orlando, USA United States
Duration: 8 Jun 200912 Jun 2009


Conference54th ASME Turbo Expo 2009
Country/TerritoryUSA United States


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