Results 11 to 20 of about 494,605 (210)
Thermoacoustic Instability in Combustors
Annual Review of Fluid MechanicsThermoacoustic instability is a flow instability that arises due to a two-way coupling between acoustic waves and unsteady heat release rate. It can cause damaging, large-amplitude oscillations in the combustors of gas turbines, aeroengines, rocket engines, etc., and the transition to decarbonized fuels is likely to introduce new thermoacoustic ...
Morgans, AS, Yang, D
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Nonlinear saturation of the thermoacoustic instability [PDF]
The Journal of the Acoustical Society of America, 2000 A weakly nonlinear theory of the thermoacoustic instability in gas-filled tubes is developed in the time domain by exploiting the difference between the instability time scale and the period of standing waves. By carrying the expansion to fourth order in the perturbation parameter, explicit results for the initial growth, nonlinear evolution, and final
Karpov, S., Prosperetti, A.
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Thermoacoustic Instability in Solid Rocket Motor: Non-Normality and Nonlinear Instabilities
48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition, 2010 An analytical framework is developed to understand and predict the thermoacoustic instability in solid rocket motors, taking into account the non-orthogonality of the eigenmodes of the unsteady coupled system. The coupled system comprises the dynamics of the acoustic field and the propellant burn rate.
Mariappan, Sathesh, Sujith, R. I.
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The physics and regularities of the neutron-thermoacoustic instability
Ядерна фізика та енергетика, 2018 The physics and regularities of the neutron-thermoacoustic instability (NTAI) in nuclear channels with subcooled nucleate boiling flows are explained. The method for obtaining the characteristic equation of NTAI in a VVER-type reactor is given.
S. N. Pelykh +2 more
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Coupling-induced instability in a ring of thermoacoustic oscillators. [PDF]
Proc Math Phys Eng Sci, 2022 Thermoacoustic instabilities in can-annular combus-tors of stationary gas turbines lead to unstable Bloch modes which appear as rotating acoustic pressure waves along the turbine annulus. The multiscale, multiphysical nature of the full problem makes a detailed analysis challenging.
Pedergnana T, Noiray N.
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Intermittency: A State that Precedes Thermoacoustic Instability
, 2017 Thermoacoustic instability is a plaguing problem in confined combustion systems, where self-sustained periodic oscillations of ruinous amplitudes that cause serious damage and performance loss to propulsive and power generating systems occur. In this chapter, we review the recent developments in understanding the transition route to thermoacoustic ...
Samadhan A. Pawar, R. I. Sujith
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Linear thermoacoustic instability in the time domain [PDF]
The Journal of the Acoustical Society of America, 1998 An approximate time-domain description of the development of the thermoacoustic instability in gas-filled tubes is developed by exploiting the difference between the instability time scale and the period of standing waves. The perturbation results compare very favorably with the exact frequency-domain theory of Rott.
S. Karpov, A. Prosperetti
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Averaging of thermoacoustic azimuthal instabilities [PDF]
Journal of Sound and Vibration, 2021 Journal of Sound and Vibration (2020)
Ghirardo, G., Gant, F.
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Non-linearities in the thermoacoustic response of a premixed swirl burner [PDF]
, 2009 PhDLean premixed combustion remains one of the simplest and most effective methods of reducing NOx emissions in industrial gas turbines. Lean premixed flames are however prone to an undesirable side effect known as combustion instability, reducing ...
Hosseini, S. M. Reza
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