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Advanced numerical simulation of turbine rim seal flows and consideration for RANS turbulence modelling

Gao, Feng, Poujol, N, Chew, John and Beard, P (2018) Advanced numerical simulation of turbine rim seal flows and consideration for RANS turbulence modelling In: ASME Turbo Expo 2018: Turbomachinery Technical Conference & Exposition, 11 - 15 June 2018, Oslo, Norway.

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Abstract

This paper reports large-eddy simulations (LES) and unsteady Reynolds-averaged Navier-Stokes (URANS) calculations of a turbine rim seal configuration previously investigated experimentally. The configuration does not include any vanes, blades or external flows, but investigates inherent unsteady flow features and limitations of CFD modelling identified in engine representative studies. Compared to RANS and URANS CFD models, a sector LES model showed closer agreement with mean pressure measurements. LES models also showed agreement with measured pressure frequency spectra, but discrepancies were found between the LES and experiment in the speed and the circumferential lobe number of the unsteady flow structures. Sensitivity of predictions to modelling assumptions and differences with experimental data are investigated through CFD calculations considering sector size, interaction between the rim cavity and the inner cavity, outer annulus boundary conditions, and the coolant mass flow. Significant sensitivity to external flow conditions, which could contribute to differences with measurements, is shown, although some discrepancies remain. Further detailed analysis of the CFD solutions is given illustrating the complex flow physics. Possible improvement of a steady RANS model using a priori analysis of LES was investigated, but showed a rather small improvement in mean pressure prediction.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Gao, Fengf.gao@surrey.ac.uk
Poujol, N
Chew, JohnJ.Chew@surrey.ac.uk
Beard, P
Date : 11 June 2018
DOI : 10.1115/GT2018-75116
Copyright Disclaimer : Copyright by 2018 by Rolls-Royce plc
Additional Information : Paper No. GT2018-75116, pp. V05BT15A005; 14 pages
Depositing User : Melanie Hughes
Date Deposited : 01 Jun 2018 09:16
Last Modified : 24 May 2019 11:06
URI: http://epubs.surrey.ac.uk/id/eprint/846722

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