Time Domain Simulation of Combustion Instabilities in Annular Combustors
- 1 July 2003
- journal article
- Published by ASME International in Journal of Engineering for Gas Turbines and Power
- Vol. 125 (3), 677-685
- https://doi.org/10.1115/1.1582496
Abstract
A novel method for the simulation of combustion instabilities in annular combustors is presented. It is based on the idea to solve the equations governing the acoustics in the time domain and couple them to a model for the heat release in the flames. The linear wave equation describing the temporal and spatial evolution of the pressure fluctuations is implemented in a finite element code. Providing high flexibility, this code in principle allows both the computational domain to be of arbitrary shape and the mean flow to be included. This yields applicability to realistic technical combustors. The fluctuating heat release acting as a volume source appears as a source term in the equation to be solved. Employing a time-lag model, the heat release rate at each individual burner is related to the velocity in the corresponding burner at an earlier time. As saturation also is considered, a nonlinearity is introduced into the system. Starting the simulation from a random initial perturbation with suitable values for the parameters of the heat release model, a self-excited instability is induced, leading to a finite-amplitude limit cycle oscillation. The feasibility of the approach is demonstrated with three-dimensional simulations of a simple model annular combustor. The effect of the model parameters and of axial mean flow on the stability and the shape of the excited modes is shown.Keywords
This publication has 21 references indexed in Scilit:
- Influence of the Combustor Aerodynamics on Combustion Instabilities From Equivalence Ratio FluctuationsJournal of Engineering for Gas Turbines and Power, 2002
- Numerical simulation of self-excited combustion oscillations in a non-premixed burnerCombustion Science and Technology, 2002
- Three Dimensional Thermoacoustic Oscillation in a Premix CombustorPublished by ASME International ,2001
- Prediction and Measurement of Thermoacoustic Improvements in Gas Turbines With Annular Combustion SystemsJournal of Engineering for Gas Turbines and Power, 2000
- Detailed Analysis of the Acoustic Mode Shapes of an Annular Combustion ChamberPublished by ASME International ,1999
- Nonlinear Heat-Release/Acoustic Model for Thermoacoustic Instability in Lean Premixed CombustorsPublished by ASME International ,1998
- Nonlinear self-excited oscillations of a ducted flameJournal of Fluid Mechanics, 1997
- Some recent results for nonlinear acoustics in combustion chambersAIAA Journal, 1994
- Sound Sources in Aerodynamics-Fact and FictionAIAA Journal, 1982
- Non-Linear Growth and Limiting Amplitude of Acoustic Oscillations in Combustion ChambersCombustion Science and Technology, 1971