Experimental measurements of ingestion through turbine rim seals. Part 2: rotationally-induced ingress (ASME GT2011-45313)

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

14 Citations (Scopus)

Abstract

Part 1 of this two-part paper presented experimental results for externally-induced (EI) ingress, where the ingestion of hot gas through the rim seal into the wheel-space of a gas turbine is controlled by the circumferential variation of pressure in the external annulus. In Part 2, experimental results are presented for rotationally-induced (RI) ingress, where the ingestion is controlled by the pressure generated by the rotating fluid in the wheel-space. Although EI ingress is the common form of ingestion through turbine rim seals, RI ingress or combined ingress (where EI and RI ingress are both significant) is particularly important for double seals, where the pressure asymmetries are attenuated in the annular space between the inner and outer seals. In this paper, the sealing effectiveness was determined from concentration measurements, and the variation of effectiveness with sealing flow rate was compared with theoretical curves for RI ingress obtained from an orifice model. Using a non-dimensional sealing parameter, Φ , the data could be collapsed onto a single curve, and the theoretical variation of effectiveness with Φ was in very good agreement with the data for a wide range of flow rates and rotational speeds. It was shown that the sealing flow required to prevent RI ingress was much less than that needed for EI ingress, and it was also shown that the effectiveness of a radial-clearance seal is significantly better than that for an axial-clearance seal for both EI and RI ingress.
LanguageEnglish
Title of host publicationProceedings of the ASME Turbo Expo, 2011
Subtitle of host publicationTurbine Technical Conference and Exposition
Place of PublicationVancouver, Canada
PublisherASME
Pages755-765
Number of pages11
Volume5
ISBN (Print)9780791854655
StatusPublished - 2011
EventASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 - Vancouver, Canada
Duration: 5 Jun 20119 Jun 2011

Conference

ConferenceASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011
CountryCanada
CityVancouver
Period5/06/119/06/11

Fingerprint

Seals
Turbines
Wheels
Flow rate
Orifices
Gas turbines
Fluids
Gases

Cite this

Sangan, C. M., Pountney, O. J., Zhou, K., Wilson, M., Owen, J. M., & Lock, G. D. (2011). Experimental measurements of ingestion through turbine rim seals. Part 2: rotationally-induced ingress (ASME GT2011-45313). In Proceedings of the ASME Turbo Expo, 2011: Turbine Technical Conference and Exposition (Vol. 5, pp. 755-765). Vancouver, Canada: ASME.

Experimental measurements of ingestion through turbine rim seals. Part 2 : rotationally-induced ingress (ASME GT2011-45313). / Sangan, C.M.; Pountney, O.J.; Zhou, K.; Wilson, M.; Owen, J.M.; Lock, G.D.

Proceedings of the ASME Turbo Expo, 2011: Turbine Technical Conference and Exposition. Vol. 5 Vancouver, Canada : ASME, 2011. p. 755-765.

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

Sangan, CM, Pountney, OJ, Zhou, K, Wilson, M, Owen, JM & Lock, GD 2011, Experimental measurements of ingestion through turbine rim seals. Part 2: rotationally-induced ingress (ASME GT2011-45313). in Proceedings of the ASME Turbo Expo, 2011: Turbine Technical Conference and Exposition. vol. 5, ASME, Vancouver, Canada, pp. 755-765, ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011, Vancouver, Canada, 5/06/11.
Sangan CM, Pountney OJ, Zhou K, Wilson M, Owen JM, Lock GD. Experimental measurements of ingestion through turbine rim seals. Part 2: rotationally-induced ingress (ASME GT2011-45313). In Proceedings of the ASME Turbo Expo, 2011: Turbine Technical Conference and Exposition. Vol. 5. Vancouver, Canada: ASME. 2011. p. 755-765
Sangan, C.M. ; Pountney, O.J. ; Zhou, K. ; Wilson, M. ; Owen, J.M. ; Lock, G.D. / Experimental measurements of ingestion through turbine rim seals. Part 2 : rotationally-induced ingress (ASME GT2011-45313). Proceedings of the ASME Turbo Expo, 2011: Turbine Technical Conference and Exposition. Vol. 5 Vancouver, Canada : ASME, 2011. pp. 755-765
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AB - Part 1 of this two-part paper presented experimental results for externally-induced (EI) ingress, where the ingestion of hot gas through the rim seal into the wheel-space of a gas turbine is controlled by the circumferential variation of pressure in the external annulus. In Part 2, experimental results are presented for rotationally-induced (RI) ingress, where the ingestion is controlled by the pressure generated by the rotating fluid in the wheel-space. Although EI ingress is the common form of ingestion through turbine rim seals, RI ingress or combined ingress (where EI and RI ingress are both significant) is particularly important for double seals, where the pressure asymmetries are attenuated in the annular space between the inner and outer seals. In this paper, the sealing effectiveness was determined from concentration measurements, and the variation of effectiveness with sealing flow rate was compared with theoretical curves for RI ingress obtained from an orifice model. Using a non-dimensional sealing parameter, Φ , the data could be collapsed onto a single curve, and the theoretical variation of effectiveness with Φ was in very good agreement with the data for a wide range of flow rates and rotational speeds. It was shown that the sealing flow required to prevent RI ingress was much less than that needed for EI ingress, and it was also shown that the effectiveness of a radial-clearance seal is significantly better than that for an axial-clearance seal for both EI and RI ingress.

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