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Performance Of A Turbine Rim Seal Subject To Rotationally-Driven And Pressure-Driven Ingestion

Revert, Anna Bru, Beard, Paul F., Chew, John W. and Bottenheim, Sebastiaan (2020) Performance Of A Turbine Rim Seal Subject To Rotationally-Driven And Pressure-Driven Ingestion In: ASME Turbomachinery Technical Conference & Exposition (Turbo Expo 2020), 22-26 Jun 2020, ExCeL London Convention Center in London, United Kingdom.

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Abstract

This experimental study considered the performance of a chute rim seal downstream of turbine inlet guide vanes (but without rotor blades). The experimental set up reproduced rotationally-driven ingestion without vanes and conditions of pressure-driven ingestion with vanes. The maximum rotor speed was 9000 rpm corresponding to a rotational Reynolds number of 3.3x106 with a flow coefficient of 0.45. Measurements of mean pressures in the annulus and the disc rim cavity as well as values of sealing effectiveness deduced from gas concentration data are presented. At high values of flow coefficient (low rotational speeds), the circumferential pressure variation generated by the vanes drove relatively high levels of ingestion into the disc rim cavity. For a given purge flow rate, increasing the disc rotational speed led to a reduction in ingestion, shown by higher values of sealing effectiveness, despite the presence of upstream vanes. At Uax/(Ωb) = 0.45, the sealing effectiveness approached that associated with purely rotationally-driven ingestion. A map of sealing effectiveness against non-dimensional purge flow summarises the results and illustrates the combined rotational and pressure-driven effects on the ingestion mechanism. The results imply that flow coefficient is an important parameter in rim sealing and that rotational effects are important in many applications, especially turbines with low flow coefficient.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Revert, Anna Bru
Beard, Paul F.
Chew, John W.J.Chew@surrey.ac.uk
Bottenheim, Sebastiaan
Date : 9 April 2020
Funders : Rolls-Royce plc, Innovate UK
Copyright Disclaimer : Copyright © 2020 by Rolls-Royce plc
Related URLs :
Additional Information : Paper no. GT2020-14773. (Originally scheduled for 22-26 June in London, this conference was actually rescheduled as a 'virtual' online conference on 21-25 September.)
Depositing User : Clive Harris
Date Deposited : 05 Jun 2020 13:02
Last Modified : 22 Sep 2020 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/857089

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