Results 21 to 30 of about 3,434 (176)
Rijke Organ: Modeling and Control of Array of Rijke Tubes
IFAC-PapersOnLine, 2020 Abstract Rijke tube is a popular physical experiment demonstrating a spontaneous generation of sound in an open vertical pipe with a heat source. This laboratory instance of thermoacoustic instability has been researched due to its significance in practical thermoacoustic systems.
Krištof Pučejdl +2 more
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Hopf Bifurcation Analysis of the Combustion Instability in a Liquid Rocket Engine
Aerospace, 2022 The bifurcation process of self-sustained combustion instability pressure perturbations in a liquid rocket combustor is investigated based on the Helmholtz equations and a pressure dependent flame describing function. The modal frequency and growth rates
Xuanye Liang +3 more
doaj +1 more source
Simulation of 2-way fluid structure interaction in a 3D model combustor [PDF]
, 2012 The liner of a gas turbine combustor is a very flexible structure that is exposed to the pressure oscillations that occur in the combustor. These pressure oscillations can be of very high amplitude due to thermoacoustic instability, when the fluctuations
Alemela, P.R., Kok, J.B.W., Shahi, M.
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Transition to Instability in Segmented Rijke Tube [PDF]
The Open Thermodynamics Journal, 2009 Thermoacoustic instabilities can arise in systems where unsteady heat release is favorably coupled with acous- tic pressure oscillations. A modified Rijke tube with segments having different sections is found to have lower threshold levels of heat addition rate needed for exciting the fundamental acoustic mode of the tube.
Rafael Hernandez, Konstantin I. Matveev
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Adjoint-based linear analysis in reduced-order thermo-acoustic models [PDF]
, 2014 This paper presents the linear theory of adjoint equations as applied to thermo-acoustics. The purpose is to describe the mathematical foundations of adjoint equations for linear sensitivity analysis of thermo-acoustic systems, recently developed by ...
Juniper, MP, Magri, L
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International Journal of Aerospace Engineering, Volume 2020, Issue 1, 2020., 2020 To broaden its’ effective frequency range and to improve its transmission loss performance, a modified design of a Helmholtz resonator is proposed and evaluated by implementing a rigid baffle in its cavity. Comparison is then made between the proposed design and the conventional one by considering a rectangular duct with the resonator implemented in ...
Di Guan +3 more
wiley +1 more source
Modeling for Active Control of Combustion and Thermally Driven Oscillations [PDF]
, 1991 Organized oscillations excited and sustained by high densities of energy release in combustion chambers have long caused serious problems in development of propulsion systems.
Culick, F. E. C. +3 more
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A Green's function approach to predict nonlinear thermoacoustic instabilities in combustors [PDF]
, 2016 The prediction of thermoacoustic instabilities is fundamental for combustion systems such as domestic burners and industrial gas turbine engines. High-amplitude pressure oscillations cause thermal and mechanical stress to the equipment, leading to ...
Bigongiari, A, Heckl, MA
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Weakly nonlinear analysis of thermoacoustic bifurcations in the Rijke tube [PDF]
, 2016 In this study we present a theoretical weakly nonlinear framework for the prediction of thermoacoustic oscillations close to Hopf bifurcations. We demonstrate the method for a thermoacoustic network that describes the dynamics of an electrically heated ...
Juniper, MP, Orchini, A, Rigas, G
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The stability of a rising droplet: an inertialess nonmodal growth mechanism [PDF]
, 2015 Prior modal stability analysis (Kojima et al., Phys. Fluids, vol. 27, 1984) predicted that a rising or sedimenting droplet in a viscous fluid is stable in the presence of surface tension no matter how small, in contrast to experimental and numerical ...
Gallaire, Francois +2 more
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