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RISInferring Flame Transfer Functions of Turbulent Conical Flames From Pressure Measurements
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We use approximate Bayesian inference, accelerated by adjoint methods, to construct a quantitatively accurate model of the thermoacoustic behavior of a weakly turbulent conical flame in a duct. We first perform a series ...
A Theoretical Approach for Passive Control of Thermoacoustic Oscillations: Application to Ducted Flames
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this paper, we develop a linear technique that predicts how the stability of a thermoacoustic system changes due to the action of a generic passive feedback device or a generic change in the base state. From this, one ...
Shape Optimization of an Industrial Aeroengine Combustor to Reduce Thermoacoustic Instability
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We parameterize the geometry of an industrial aeroengine combustor using free-form deformation (FFD). We then define the thermoacoustic system parameters and impose the acoustic boundary conditions to calculate the ...
Nonlinear Phenomena in Thermoacoustic Systems With Premixed Flames
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Nonlinear analysis of thermoacoustic instability is essential for the prediction of the frequencies, amplitudes, and stability of limit cycles. Limit cycles in thermoacoustic systems are reached when the energy input from ...
Modal Stability TheoryLecture notes from the FLOW NORDITA Summer School on Advanced Instability Methods for Complex Flows, Stockholm, Sweden, 2013
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: This article contains a review of modal stability theory. It covers local stability analysis of parallel flows including temporal stability, spatial stability, phase velocity, group velocity, spatiotemporal stability, the ...
Shape Optimization of Thermoacoustic Systems Using a Two-Dimensional Adjoint Helmholtz Solver
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Thermoacoustic instabilities, which arise due to the interaction between flames and acoustics, are sensitive to small changes to the system parameters. In this paper, we apply adjoint-based shape optimization to a 2D finite ...
Bayesian Machine Learning for the Prognosis of Combustion Instabilities From Noise
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Experiments are performed on a turbulent swirling flame placed inside a vertical tube whose fundamental acoustic mode becomes unstable at higher powers and equivalence ratios. The power, equivalence ratio, fuel composition, ...
Assimilation of Experimental Data to Create a Quantitatively Accurate Reduced-Order Thermoacoustic Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We combine a thermoacoustic experiment with a thermoacoustic reduced order model using Bayesian inference to accurately learn the parameters of the model, rendering it predictive. The experiment is a vertical Rijke tube ...
Bayesian Data Assimilation in Cold Flow Experiments on an Industrial Thermoacoustic Rig
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: We assimilate experimental data from nonreacting flow in the SCARLET (SCaled Acoustic Rig for Low Emission Technologies) test rig using physics-based Bayesian inference. We model the complex geometry of the combustor with ...