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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.
core +8 more sources
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
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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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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Experimental sensitivity analysis and control of thermoacoustic systems [PDF]
, 2015 In this paper, we report the results of an experimental sensitivity analysis on a thermoacoustic system – an electrically heated Rijke tube. We measure the change of the linear stability characteristics of the system, quantified as shifts in the growth ...
Jamieson, NP +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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Bistability and Triggering Analysis of Thermoacoustic Instability in a Horizontal Rijke Tube
Xibei Gongye Daxue Xuebao, 2019 Dynamical systems theory has been often employed to study nonlinear flow and flame dynamics in combustion systems. However, the corresponding studies using nonlinear dynamics to analyze the Rijke tube thermoacoustic system are still occasional.
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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
core +2 more sources