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Interaction of rim seal and annulus flows in an axial flow turbine

Cao, C, Chew, John, Millington, PR and Hogg, SI (2003) Interaction of rim seal and annulus flows in an axial flow turbine American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI, 5 B. pp. 1011-1019.

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Abstract

A combined computational fluid dynamics (CFD) and experimental study of interaction of main gas path and rim sealing flow is reported. The experiments were conducted on a two stage axial turbine and included pressure measurements for the cavity formed between the stage 2 rotor disc and the upstream diaphragm for two values of the diaphragm-to-rotor axial clearance. The pressure measurements indicate that ingestion of the highly swirling annulus flow leads to increased vortex strength within the cavity. This effect is particularly strong for the larger axial clearance. Results from a number of steady and unsteady CFD models have been compared to the measured results. Good agreement between measurement and calculation for time-averaged pressures was obtained using unsteady CFD models, which predicted previously unknown unsteady flow features. This led to fest response pressure transducer measurements being made on the rig, and these confirmed the CED prediction.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Cao, CUNSPECIFIEDUNSPECIFIED
Chew, JohnJ.Chew@surrey.ac.ukUNSPECIFIED
Millington, PRUNSPECIFIEDUNSPECIFIED
Hogg, SIUNSPECIFIEDUNSPECIFIED
Date : 2003
Identification Number : 10.1115/GT2003-38368
Depositing User : Symplectic Elements
Date Deposited : 18 Jul 2017 09:30
Last Modified : 18 Jul 2017 09:30
URI: http://epubs.surrey.ac.uk/id/eprint/712733

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