This paper describes a new research facility which experimentally models hot gas ingestion into the wheel-space of an axial turbine stage. Measurements of the 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 the 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 nondimensional 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 II of this paper describes an experimental investigation of rotationally-induced (RI) ingress, where there is no mainstream flow and consequently no circumferential variation of external pressure.
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University of Bath,
School of Jet Propulsion,
Beihang University,
University of Bath,
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March 2013
Research-Article
Experimental Measurements of Ingestion Through Turbine Rim Seals—Part I: Externally Induced Ingress
Oliver J. Pountney,
University of Bath,
Oliver J. Pountney
Department of Mechanical Engineering
,University of Bath,
Bath, BA2 7AY, UK
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Kunyuan Zhou,
School of Jet Propulsion,
Beihang University,
Kunyuan Zhou
Department of Engineering Thermophysics
,School of Jet Propulsion,
Beihang University,
Beijing, 100191, PRC
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Gary D. Lock
University of Bath,
Gary D. Lock
Department of Mechanical Engineering
,University of Bath,
Bath, BA2 7AY, UK
Search for other works by this author on:
Oliver J. Pountney
Department of Mechanical Engineering
,University of Bath,
Bath, BA2 7AY, UK
Kunyuan Zhou
Department of Engineering Thermophysics
,School of Jet Propulsion,
Beihang University,
Beijing, 100191, PRC
Gary D. Lock
Department of Mechanical Engineering
,University of Bath,
Bath, BA2 7AY, UK
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received October 14, 2011; final manuscript received October 27, 2011; published online November 8, 2012. Editor: David Wisler.
J. Turbomach. Mar 2013, 135(2): 021012 (10 pages)
Published Online: November 8, 2012
Article history
Received:
October 14, 2011
Revision Received:
October 27, 2011
Citation
Sangan, C. M., Pountney, O. J., Zhou, K., Wilson, M., Michael Owen, J., and Lock, G. D. (November 8, 2012). "Experimental Measurements of Ingestion Through Turbine Rim Seals—Part I: Externally Induced Ingress." ASME. J. Turbomach. March 2013; 135(2): 021012. https://doi.org/10.1115/1.4006609
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