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 in Book/Report/Conference proceedingChapter

11 Citations (Scopus)

Abstract

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
PublisherASME
Pages1051-1060
Number of pages10
Volume3
ISBN (Electronic)978-0-7918-3849-5
ISBN (Print)9780791848845
DOIs
Publication statusPublished - 2009
Event54th ASME Turbo Expo 2009: Power for Land, Sea, and Air - Orlando, USA United States
Duration: 8 Jun 200912 Jun 2009

Conference

Conference54th ASME Turbo Expo 2009
CountryUSA United States
CityOrlando
Period8/06/0912/06/09

Fingerprint

Cooling systems
Nozzles
Heat transfer
Rotating disks
Flow rate
Liquid crystals
Air
Experiments
Digital cameras
Video cameras
Flow visualization
Polycarbonates
Coolants
Heat transfer coefficients
Computational fluid dynamics
Boundary layers
Cooling
Temperature

Cite this

Kakade, V. U., Lock, G. D., Wilson, M., Owen, J. M., & Mayhew, J. E. (2009). Effect of radial location of nozzles on heat transfer in pre-swirl cooling systems. In Proceedings of the ASME Turbo Expo 2009 (Vol. 3, pp. 1051-1060). ASME. https://doi.org/10.1115/GT2009-59090

Effect of radial location of nozzles on heat transfer in pre-swirl cooling systems. / Kakade, Vinod U; Lock, Gary D; Wilson, Michael; Owen, J M; Mayhew, J E.

Proceedings of the ASME Turbo Expo 2009. Vol. 3 ASME, 2009. p. 1051-1060.

Research output: Chapter in Book/Report/Conference proceedingChapter

Kakade, VU, Lock, GD, Wilson, M, Owen, JM & Mayhew, JE 2009, Effect of radial location of nozzles on heat transfer in pre-swirl cooling systems. in Proceedings of the ASME Turbo Expo 2009. vol. 3, ASME, pp. 1051-1060, 54th ASME Turbo Expo 2009, Orlando, USA United States, 8/06/09. https://doi.org/10.1115/GT2009-59090
Kakade VU, Lock GD, Wilson M, Owen JM, Mayhew JE. Effect of radial location of nozzles on heat transfer in pre-swirl cooling systems. In Proceedings of the ASME Turbo Expo 2009. Vol. 3. ASME. 2009. p. 1051-1060 https://doi.org/10.1115/GT2009-59090
Kakade, Vinod U ; Lock, Gary D ; Wilson, Michael ; Owen, J M ; Mayhew, J E. / Effect of radial location of nozzles on heat transfer in pre-swirl cooling systems. Proceedings of the ASME Turbo Expo 2009. Vol. 3 ASME, 2009. pp. 1051-1060
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AB - 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.

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