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RISAnalysis of Thermoacoustic Modes in Can-Annular Combustors Using Effective Bloch-Type Boundary Conditions
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Heavy-duty gas turbines are commonly designed with can-annular combustors, in which all flames are physically separated. Acoustically, however, the cans communicate via the upstream located compressor plenum or at the ...
Effects of Asymmetry on Thermoacoustic Modes in Annular Combustors: A Higher-Order Perturbation Study
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Gas-turbine combustion chambers typically consist of nominally identical sectors arranged in a rotationally symmetric pattern. However, in practice, the geometry is not perfectly symmetric. This may be due to design ...
Effects of Nonlinear Modal Interactions on the Thermoacoustic Stability of Annular Combustors
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this theoretical and numerical analysis, a low-order network model is used to investigate a thermoacoustic system with discrete rotational symmetry. Its geometry resembles that of the MICCA combustor (Laboratoire EM2C, ...
A Non-Compact Effective Impedance Model for Can-to-Can Acoustic Communication: Analysis and Optimization of Damping Mechanisms
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Can-annular combustors can feature azimuthal instabilities even if the acoustic coupling between the individual cans is weak. Recently, various studies have focused on modeling the acoustic communication between adjacent ...
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 ...
Burner and Flame Transfer Matrices of Jet-Stabilized Flames: Influence of Jet Velocity and Fuel Properties
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: To achieve the decarbonization of electrical power generation, gas turbines need to be upgraded to combust high-hydrogen content fuels reliably. One of the main challenges in this upgrade is the burner design. A promising ...
Characterization of a Fluidically Variable Swirl Burner: Effects of the Imprinted Swirl on Flame Shapes and Emissions for Hydrogen–Methane Blends
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Abstract. Gas turbine combustors rely on swirling flows for flame stabilization. The flow's swirl number is herein characterized by the burner's swirler geometry. In addition to stability, swirl represents an important ...
Gradient-Free Optimization in Thermoacoustics: Application to a Low-Order Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Machine learning and automatized routines for parameter optimization have experienced a surge in development in the past years, mostly caused by the increasing availability of computing capacity. Gradient-free optimization ...
Experimental Design Validation of a Swirl-Stabilized Burner With Fluidically Variable Swirl Number
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Swirling flows are commonly used for flame stabilization in gas turbine combustors, which are hence equipped with suitable swirler units. In these units the air rotation, quantified by the swirl number, is fixed through ...
Experimental Design Validation of a Swirl-Stabilized Burner With Fluidically Variable Swirl Number
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Swirling flows are commonly used for flame stabilization in gas turbine combustors, which are hence equipped with suitable swirler units. In these units the air rotation, quantified by the swirl number, is fixed through ...