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research-article

Development and Applications of a Coupled Particle Deposition - Dynamic Mesh Morphing Approach for the Numerical Simulation of Gas Turbine Flows

[+] Author and Article Information
Peter R Forsyth

Southwell Building Osney Mead Oxford, Oxfordshire OX2 0ES United Kingdom
pete_forsyth@hotmail.co.uk

David R.H. Gillespie

Department of Engineering Science Parks Road Oxford, OX1 3PJ United Kingdom
david.gillespie@eng.ox.ac.uk

Matthew McGilvray

Osney Thermo-Fluids LaboratorySouthwell Building, Osney Mead Oxford, Oxfordshire OX2 0ES United Kingdom
matthew.mcgilvray@eng.ox.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4037825 History: Received July 09, 2017; Revised July 20, 2017

Abstract

The presence and accretion of airborne particulates, including ash, sand, dust, and other compounds, in gas turbine engines can adversely affect performance and life of components. Engine experience and experimental work has shown that the thickness of accreted layers of these particulates can become large relative to the engine components on which they form. Numerical simulation to date has largely ignored the effects of resultant changes in the passage geometry due to the build-up of deposited particles. This paper will focus on updating the boundaries of the flow volume geometry by integrating the deposited volume of particulates on the solid surface. The technique is implemented using a novel, coupled deposition-dynamic mesh morphing approach to the simulation of particulate-laden flows using RANS modelling of the bulk fluid, and Lagrangian-based particulate tracking. On an iterative basis the particle deposition distributions are used to modify the surface topology by altering the locations of surface nodes, which modifies the mesh. The continuous phase solution and particle tracking are then recalculated. The sensitivity to the modelling time steps employed is explored. An impingement geometry case is used to assess the validity of the technique, and a passage with film cooling holes is interrogated. Differences are seen for all sticking and solid phase motion models employed. At small solid particle sizes considerable disparity is observed between the particle motion modelling approaches, while the position and level of accretion is altered through the use of a non-isotropic stick and bounce model.

Copyright (c) 2017 by ASME
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