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research-article

Strongly Coupled Fluid-Structure Interaction in a 3D Model Combustor during Limit Cycle Oscillations

[+] Author and Article Information
Mina Shahi

University of Twente, Faculty of Engineering Technology, Laboratory of Thermal Engineering, Enschede, The Netherlands
m.shahi@utwente.nl

J.B.W. Kok

University of Twente, Faculty of Engineering Technology, Laboratory of Thermal Engineering, Enschede, The Netherlands
j.b.w.kok@utwente.nl

Juan Carlos Roman Casado

University of Twente, Faculty of Engineering Technology, Laboratory of Thermal Engineering, Enschede, The Netherlands
mproles@gmail.com

Artur K. Pozarlik

University of Twente, Faculty of Engineering Technology, Laboratory of Thermal Engineering, Enschede, The Netherlands
a.k.pozarlik@utwente.nl

1Corresponding author.

ASME doi:10.1115/1.4038234 History: Received February 08, 2017; Revised July 21, 2017

Abstract

Due to the high temperature of the flue gas flowing at high velocity and pressure, the wall cooling is extremely important for the liner of a gas turbine engine combustor. The liner material is heat resistant steel with relatively low heat conductivity. To accommodate outside wall forced air cooling, the liner is designed to be thin, which unfortunately facilitates the possibility of high amplitude wall vibrations (and failure due to fatigue) in case of pressure fluctuations in the combustor. The latter may occur due to a possible occurrence of a feedback loop between the aerodynamics, the combustion, the acoustics and the structural vibrations. The structural vibrations act as a source of acoustic emitting the acoustic waves to the confined fluid. This leads to amplification in the acoustic filed and hence the magnitude of instability in the system. The aim of this paper is to explore the mechanism of fluid-structure interaction on the LIMOUSINE setup which leads to limit cycle of pressure oscillations (LCO). Computational fluid dynamics (CFD) analysis using a RANS approach is performed to obtain the thermal and mechanical loading of the combustor liner and finite element model (FEM) renders the temperature, stress distribution, and deformation in the liner. Results are compared to other numerical approaches like zero-way interaction and conjugated heat transfer model (CHT). To recognize the advantage/disadvantage of each method validation is made with the available measured data for the pressure and vibration signals.

Copyright (c) 2017 by ASME
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