Surface Impedance Determination via Numerical Resolution of the Inverse Helmholtz Problem
, 2017 Assigning boundary conditions, such as acoustic impedance, to the frequency domain thermoviscous wave equations (TWE), derived from the linearized Navier-Stokes equations (LNSE) poses a Helmholtz problem, solution to which yields a discrete set of ...
Gupta P. +5 more
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, 2007 We report on a new type of localized structure, an ultrasonic cavity soliton, supported by large aspect-ratio acoustic resonators containing viscous media.
de Valcarcel, G. J. +2 more
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Causality and intrinsic thermoacoustic instability modes
, 2014 Direct numerical simulation of a confined laminar premixed flame has been performed in an anechoic combustor, showing self-sustained intrinsic thermoacoustic oscillations. Theoretical predictions based on acoustic jump relations and the n − τ model for the flame are presented and causality concerns are discussed.
Courtine, Emilien +6 more
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Flame Propagation Characteristics of Syngas-Air in the Hele-Shaw Duct with Different Equivalence Ratios and Ignition Positions. [PDF]
ACS Omega, 2022 Diao S +5 more
europepmc +1 more source
High Temperature Dynamic Pressure Measurements Using Silicon Carbide Pressure Sensors [PDF]
Un-cooled, MEMS-based silicon carbide (SiC) static pressure sensors were used for the first time to measure pressure perturbations at temperatures as high as 600 C during laboratory characterization, and subsequently evaluated in a combustor rig operated
Chang, Clarence T. +3 more
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Innovative Adaptive Control Method Demonstrated for Active Suppression of Instabilities in Engine Combustors [PDF]
This year, an improved adaptive-feedback control method was demonstrated that suppresses thermoacoustic instabilities in a liquid-fueled combustor of a type used in aircraft engines.
Kopasakis, George
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Active Combustion Control for Aircraft Gas-Turbine Engines-Experimental Results for an Advanced, Low-Emissions Combustor Prototype [PDF]
Lean combustion concepts for aircraft engine combustors are prone to combustion instabilities. Mitigation of instabilities is an enabling technology for these low-emissions combustors.
Chang, Clarence T. +4 more
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Evolutionary Optimization of Feedback Controllers for Thermoacoustic Instabilities [PDF]
, 2006 International audienceWe present the system identifcation and the online optimization of feedback controllers applied to combustion systems using evolutionary algorithms.
Guzzella, Lino +3 more
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Characterization and Simulation of the Thermoacoustic Instability Behavior of an Advanced, Low Emissions Combustor Prototype [PDF]
Extensive research is being done toward the development of ultra-low-emissions combustors for aircraft gas turbine engines. However, these combustors have an increased susceptibility to thermoacoustic instabilities.
DeLaat, John C., Paxson, Daniel E.
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Mitigation of thermoacoustic instabilities via porous plugs
Journal of Fluid MechanicsThe interaction between the dynamics of a flame front and the acoustic field within a combustion chamber represents an aerothermochemical problem with the potential to generate hazardous instabilities, which limit burner performance by constraining design and operational parameters.
Pedro Gatón-Pérez +4 more
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