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


Reference:

Sangan, C. M., Pountney, O., Zhou, K., Wilson, M., Owen, J. M. and Lock, G., 2013. Experimental measurements of ingestion through turbine rim seals. Part 1: externally induced ingress. Journal of Turbomachinery: Transactions of the ASME, 135 (2), 021012.

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Official URL:

http://dx.doi.org/10.1115/1.4006609

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 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, phio. 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.

Details

Item Type Articles
CreatorsSangan, C. M., Pountney, O., Zhou, K., Wilson, M., Owen, J. M. and Lock, G.
DOI10.1115/1.4006609
DepartmentsFaculty of Engineering & Design > Mechanical Engineering
Research CentresAerospace Engineering Research Centre
RefereedYes
StatusPublished
ID Code32119
Additional InformationBest Paper award from the Heat Transfer Committee of the ASME International Gas Turbine Institute.

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