Experimental measurements of ingestion through turbine rim seals. Part 1: Externally-induced ingress

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

Abstract

This paper describes a new research facility which experimentally models hot gas ingestion into the wheel-space of an axial turbine stage. Measurements of CO2 gas concentration in the rim-seal region and inside the cavity are used to assess the performance of two generic (though engine-representative) rim-seal geometries in terms of the variation of concentration effectiveness with sealing flow rate. The variation of pressure in the turbine annulus, which governs this externally-induced (EI) ingestion, was obtained from steady pressure measurements downstream of the vanes and near the rim seal upstream of the rotating blades. Although the ingestion through the rim seal is a consequence of an unsteady, three-dimensional flow field and the cause-effect relationship between pressure and the sealing effectiveness is complex, the experimental data is shown to be successfully calculated by simple effectiveness equations developed from a previously published orifice model. The data illustrate that, for similar turbine-stage velocity triangles, the effectiveness can be correlated using a non-dimensional sealing parameter, Φo. In principle, and within the limits of dimensional similitude, these correlations should apply to a geometrically-similar engine at the same operating conditions. Part 2 of this paper describes an experimental investigation of rotationally-induced (RI) ingress, where there is no mainsteam flow and consequently no circumferential variation of external pressure.
Original languageEnglish
Title of host publicationProceedings of the ASME Turbo Expo 2011: Turbine Technical Conference and Exposition
Subtitle of host publicationVolume 5: Heat Transfer, Parts A and B
Place of PublicationVancouver, Canada
PublisherASME
Pages741-753
Number of pages13
Volume5
ISBN (Electronic)978-0-7918-5465-5
DOIs
Publication statusPublished - 3 May 2012
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

Cite this

Sangan, C. M., Zhou, K., Owen, J. M., Pountney, O. J., Wilson, M., & Lock, G. D. (2012). Experimental measurements of ingestion through turbine rim seals. Part 1: Externally-induced ingress. In Proceedings of the ASME Turbo Expo 2011: Turbine Technical Conference and Exposition: Volume 5: Heat Transfer, Parts A and B (Vol. 5, pp. 741-753). ASME. https://doi.org/10.1115/GT2011-45310