Flow mechanisms in axial turbine rim sealing

Chew, John, Gao, Feng and Palermo, Donato Maria (2018) Flow mechanisms in axial turbine rim sealing Proc. IMechE part C: Journal of Mechanical Engineering Science.

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Abstract

This paper presents a review of research on turbine rim sealing with emphasis placed on the underlying flow physics and modelling capability. Rim seal flows play a crucial role in controlling engine disc temperatures but represent a loss from the main engine power cycle and are associated with spoiling losses in the turbine. Elementary models that rely on empirical validation and are currently used in design do not account for some of the known flow mechanisms, and prediction of sealing performance with computational fluid dynamics (CFD) has proved challenging. CFD and experimental studies have indicated important unsteady flow effects that explain some of the differences identified in comparing predicted and measure sealing effectiveness. This review reveals some consistency of investigations across a range of configurations, with inertial waves in the rotating flow apparently interacting with other flow mechanisms which include vane, blade and seal flow interactions, disc pumping and cavity flows, shear layer and other instabilities, and turbulent mixing.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :	Name Email ORCID Chew, John J.Chew@surrey.ac.uk Gao, Feng f.gao@surrey.ac.uk Palermo, Donato Maria d.palermo@surrey.ac.uk
Date :	20 June 2018
DOI :	10.1177/0954406218784612
Copyright Disclaimer :	Copyright 2018 SAGE Publications Ltd
Depositing User :	Melanie Hughes
Date Deposited :	29 May 2018 10:20
Last Modified :	22 Jun 2018 08:22
URI:	http://epubs.surrey.ac.uk/id/eprint/846527

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