TCC Modelling - Accepted Version 19-10-2018.pdf (2.37 MB)
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Improved modelling capabilities of the airflow within turbine case cooling systems using smart porous media

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journal contribution
posted on 02.11.2018, 16:15 by Yanling LiYanling Li, Duncan WalkerDuncan Walker, John Irving
Impingement cooling is commonly employed in gas turbines to control the turbine tip clearance. During the design phase, Computational Fluid Dynamics is an effective way of evaluating such systems but for most Turbine Case Cooling (TCC) systems resolving the small scale and large number of cooling holes is impractical at the preliminary design phase. This paper presents an alternative approach for predicting aerodynamic performance of TCC systems using a “smart” porous media to replace regions of cooling holes. Numerically (CFD) defined correlations have been developed, which account for geometry and local flow field, to define the porous media loss coefficient. These are coded as a user defined function allowing the loss to vary, within the calculation, as a function of the predicted flow and hence produce a spatial variation of mass flow matching that of the cooling holes. The methodology has been tested on various geometrical configurations representative of current TCC systems and compared to full cooling hole models. The method was shown to achieve good overall agreement whilst significantly reducing both the mesh count and the computational time to a practical level.

Funding

This research was undertaken at Loughborough University within the Rolls‐Royce University Technology Centre (UTC) in Combustion System Aero Thermal Processes. It was funded by the Aerospace Technology Institute and Rolls‐Royce plc.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

Journal of Engineering for Gas Turbines and Power

Volume

141

Issue

5

Citation

LI, Y-L., WALKER, A.D. and IRVING, J., 2018. Improved modelling capabilities of the airflow within turbine case cooling systems using smart porous media. Journal of Engineering for Gas Turbines and Power, 141 (5), 051003.

Publisher

ASME (The American Society of Mechanical Engineers) © Rolls-Royce plc

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Journal of Engineering for Gas Turbines and Power and the definitive published version is available at https://doi.org/10.1115/1.4041933.

Acceptance date

18/10/2018

Publication date

2018-11-22

ISSN

0742-4795

Language

en