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RISLinear Growth Rate Estimation From Dynamics and Statistics of Acoustic Signal Envelope in Turbulent Combustors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Considerable research and development efforts are required to meet the targets of future gas turbine technologies in terms of performance, emissions, and operational flexibility. One of the recurring problems is the ...
Stability and Limit Cycles of a Nonlinear Damper Acting on a Linearly Unstable Thermoacoustic Mode
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The resonant coupling between flames and acoustics is a growing issue for gas turbine manufacturers, which can be reduced by adding acoustic dampers on the combustion chamber walls. Nonetheless, if the engine is operated ...
Synchronization of Thermoacoustic Modes in Sequential Combustors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Sequential combustion constitutes a major technological step-change for gas turbines applications. This design provides higher operational flexibility, lower emissions, and higher efficiency compared to today's conventional ...
Large Eddy Simulation of a Premixed Flame in Hot Vitiated Crossflow With Analytically Reduced Chemistry
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This numerical study deals with a premixed ethylene–air jet at 300 K injected into a hot vitiated crossflow at 1500 K and atmospheric pressure. The reactive jet in crossflow (RJICF) was simulated with compressible 3D large ...
Analysis of Azimuthal Thermo acoustic Modes in Annular Gas Turbine Combustion Chambers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Modern gas turbine combustors operating in leanpremixed mode are prone to thermoacoustic instabilities. In annular combustion chambers, usually azimuthal acoustic modes are the critical ones interacting with the flame. In ...
A Novel Damping Device for Broadband Attenuation of Low Frequency Combustion Pulsations in Gas Turbines
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Damping of thermoacoustically induced pressure pulsations in combustion chambers is a major focus of gas turbine operation. Conventional Helmholtz resonators are an excellent means to attenuate thermoacoustic instabilities ...
Accurate Prediction of Confined Turbulent Boundary Layer Flashback Through a Critically Strained Flame Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A novel boundary layer flashback model is developed based on previous measurements that showed flashback limits may be related to strained premixed flame extinction. According to the model, flashback occurs at the equivalence ...
Background-Oriented Schlieren of Fuel Jet Flapping Under Thermoacoustic Oscillations in a Sequential Combustor
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This study deals with thermoacoustic instabilities in a generic sequential combustor. The thermoacoustic feedback involves two flames: the perfectly premixed swirled flame anchored in the first stage and the sequential ...
Symmetry Breaking in an Experimental Annular Combustor Model With Deterministic Electroacoustic Feedback and Stochastic Forcing
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this study, we use an annular combustor experimental model with electroacoustic feedback to investigate systematically the effect of stochastic forcing and nonuniform flame response distribution on azimuthal thermoacoustic ...