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Modelling impingement-effusion flow inside double-walled combustor tile

conference contribution
posted on 25.09.2017, 08:25 by Dalila Ammour, Gary Page
The prediction of temperature and heat transfer throughout the solid material of a gas-turbine combustor has driven interest in cooling technology which uses impingement/effusion (IE) cooling tiles on double-skinned combustor liners. The design of the IE tile system is simple but the aerodynamics are complex. The complexity of flow curvature, combined impingement and effusion cooling and heat transfer, poses a challenge to standard RANS CFD modelling. The IE combustor tile is numerically investigated using both URANS model with the SST-SAS model and Large Eddy Simulation (LES) in the Rolls-Royce in-house CFD code. The aim is to provide accurate CFD data and to test the viability of URANS approach to predict the impingement/effusion flow. Results of pressure, velocity and turbulence quantities are presented. It is found that the SST-SAS model, with high grid resolution, shows good agreement with LES. The current CFD results are used to resolve a substantial amount of very small impingement and effusion holes. The CFD results showed that every feature of the geometry has to be resolved by the numerical mesh, which makes the simulation impractical due to time consuming and high mesh resolution. These cooling holes can be omitted from the computational mesh and their effects captured on the flow via an impingement-effusion (IE) model which is based on defining the correct mass flow inside the holes as a function of the difference of pressure in the upstream and downstream regions of both impingement and effusion regions. The latter model takes the effect of pressure and velocity and it will be extended in future to take into account the heat transfer effects. The IE model is tested and validated for the 3-D combusor tile and results of pressure showed good agreement with the LES data.

Funding

This work was carried out within DYNAMO Design methods for durability and operability of low emission combustors, funded by the EU Clean Sky JTI-CS-2013-1-SAGE-06-005.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

ASME Turbo Expo 2017 ASME Proceedings | General Computational Heat Transfer

Volume

5B

Issue

V05BT22A016

Citation

AMMOUR, D. and PAGE, G.J., 2017. Modelling impingement-effusion flow inside double-walled combustor tile. Presented at the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, Charlotte, North Carolina, USA, June 26–30, Vol. 5B, Paper No. GT2017-64913.

Publisher

© American Society of Mechanical Engineers (ASME)

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

09/03/2017

Publication date

2017

Notes

This paper is in closed access.

ISBN

9780791850886

Language

en

Location

Charlotte, North Carolina, USA

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Keywords

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