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Parameter identific...
Parameter identification of two coupled oscillator model for pure intrinsic thermoacoustic instability
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- Wildemans, Roeland (författare)
- Department of Mechanical Engineering, Eindhoven University of Technology Eindhoven, The Netherlands
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- Kornilov, Viktor (författare)
- Department of Mechanical Engineering, Eindhoven University of Technology Eindhoven, The Netherlands
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- Lopez Arteaga, Ines (författare)
- KTH,Teknisk mekanik,Department of Mechanical Engineering, Eindhoven University of Technology Eindhoven, The Netherlands
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(creator_code:org_t)
- The Institute of Noise Control Engineering of the USA, Inc. 2022
- 2022
- Engelska.
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Ingår i: Internoise 2022. - : The Institute of Noise Control Engineering of the USA, Inc..
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- In this paper, a nonlinear phenomenological model of two coupled oscillators is presented, which is able to describe the rich nonlinear behaviour stemming from an unstable pure Intrinsic Thermo-Acoustic (ITA) mode of a simple combustion system. In a bifurcation analysis of a pure ITA mode, it was observed that for increasing mean upstream velocity the flames loose stability through a supercritical Hopf bifurcation and subsequently exhibit limit cycle, quasi-periodic and period-2 limit cycle oscillations. The quasi-periodic oscillations were characterized by low frequent amplitude and frequency modulation. It is shown that a phenomenological model consisting of two coupled oscillators is able to reproduce qualitatively all the different experimentally observed regimes. This model consists of a nonlinear Van der Pol oscillator and a linear mass-spring-damper oscillator, which are nonlinearly coupled to each other. Furthermore, a parameter identification of the model parameters is executed, which shows a good quantitative match between the model and the experimental data. Hence, the presented phenomenological dynamical model accurately describes the nonlinear self-excited acoustic behaviour of premixed flames.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
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