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Experimental and Numerical Investigation of Annular Casing Impingement Arrays for Faster Casing Response

[+] Author and Article Information
Andrew Dann

Osney Thermo-Fluids Laboratory Department of Engineering Science University of Oxford Oxford, Oxfordshire OX2 0ES United Kingdom
andrew.dann@eng.ox.ac.uk

Priyanka Dhopade

Osney Thermo-Fluids Laboratory Department of Engineering Science University of Oxford Oxford, Oxfordshire OX2 0ES United Kingdom
priyanka.dhopade@eng.ox.ac.uk

Marko Bacic

Osney Thermo-Fluids Laboratory Department of Engineering Science University of Oxford Oxford, Oxfordshire OX2 0ES United Kingdom
marko.bacic@eng.ox.ac.uk

Peter Ireland

Osney Thermo-Fluids Laboratory Department of Engineering Science University of Oxford Oxford, Oxfordshire OX2 0ES United Kingdom
peter.ireland@eng.ox.ac.uk

Leo Lewis

Thermals Specialist - Structural Systems Design Rolls-Royce plc Derby, DE24 8BJ United Kingdom
leo.lewis@rolls-royce.com

1Corresponding author.

ASME doi:10.1115/1.4036061 History: Received January 06, 2017; Revised January 31, 2017

Abstract

The Transient Heat Transfer Facility (THTF) was developed at the University of Oxford to test full-scale high pressure compressor and turbine casing air systems using gas turbine engine representative secondary air system mass flow rates, total temperatures and total pressures. Transient casing response together with blade and disc responses governs achievable tip clearances in both compressors and turbines. In this paper we investigate the use of air impingement as a means to speed up the casing response. Two different impingement configurations were selected from a total of eight designs based on steady RANS predictions of maximum HTC. The 3D thermal growth of the casing was characterised by the surface temperature rise over a given period of time to assess achievable dynamic response. The experimental set-up resembles a typical aircraft engine and therefore includes measurement uncertainties arising from features such as fixtures, seals, geometries and large surface areas that are then subjected to varying thermal inertias. These can lead to circumferential temperature non-uniformities, as evident from the experimental results. The experimental data was then compared against numerical predictions from an axisymmetric, 90° sector, conjugate heat transfer model of the facility using the two impingement plate designs. The combined experimental and numerical study shows the significance of analysing the full annulus, at engine representative conditions and the benefit of an impingement array to potentially speed up casing response for future engines.

Rolls-Royce plc
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