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research-article

A COMPARISON OF SINGLE AND DOUBLE LIP RIM SEAL GEOMETRIES

[+] Author and Article Information
Svilen S. Savov

Whittle Laboratory, Dept. of Engineering, University of Cambridge, CB3 0DY, UK
sss44@cam.ac.uk

Nicholas. R. Atkins

Whittle Laboratory, Dept. of Engineering, University of Cambridge, CB3 0DY, UK
nra27@cam.ac.uk

Sumiu Uchida

Technology and Innovation HQ Mitsubishi Heavy Industries Ltd., 5-717-1 Fukahori-machi, Nagasaki 851-0392, Japan
sumiu_uchida@mhi.co.jp

1Corresponding author.

ASME doi:10.1115/1.4037027 History: Received November 24, 2016; Revised May 03, 2017

Abstract

The effect of purge flow, engine-like blade pressure field and mainstream flow coefficient are studied experimentally for a single and double lip rim seal. Compared to the single lip, the double lip seal requires less purge flow for similar levels of cavity seal effectiveness. Unlike the double lip seal, the single lip seal is sensitive to overall Reynolds number, the addition of a simulated blade pressure field and large scale non-uniform ingestion. In the case of both seals, unsteady pressure variations attributed to shear layer interaction between the mainstream and rim seal flows appear to be important for ingestion at off-design flow coefficients. The double lip seal has both a weaker vane pressure field in the rim seal cavity and a smaller difference in seal effectiveness across the lower lip than the single lip seal. As a result, the double lip seal is less sensitive in the rotor-stator cavity to changes in shear layer interaction and the effects of large scale circumferentially non-uniform ingestion. However, the reduced flow rate through the double lip seal means that the outer lip has increased sensitivity to shear layer interactions. Overall, it is shown that seal performance is driven by both the vane/blade pressure field and the gradient in seal effectiveness across the inner lip. This implies that accurate representation of both, the pressure field and the mixing due to shear layer interaction would be necessary for more reliable modelling.

Copyright (c) 2017 by ASME
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