Experimental investigation of noise induced triggering in thermoacoustic systems

Jegadeesan, Vivekanandan ; Sujith, R. I. (2013) Experimental investigation of noise induced triggering in thermoacoustic systems Proceedings of the Combustion Institute, 34 (2). pp. 3175-3183. ISSN 1540-7489

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.proci.2012.05.003


We experimentally investigate the effect of noise on the stability of a thermoacoustic system operating in a bistable region. The thermoacoustic system chosen for investigation is a ducted non-premixed flame. The system is excited by random fuel flow rate fluctuations which affects the system dynamics as parametric noise. Under the influence of noise, the system undergoes transition from stable to oscillatory state. In particular, transition is observed even when the amplitude of the noise is significantly less than the triggering amplitude of the corresponding deterministic system. While triggering from noise of low amplitudes, phase portraits reveal that the system evolves transiently towards an unstable periodic orbit, before eventually growing to a stable periodic orbit. A stochastic stability map is constructed to represent the probability of the system to undergo transition. It is also observed that the amplitude of the oscillatory state is affected by the noise level.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Noise Induced Triggering; Non-premixed Flame; Stochastic Stability; Nonlinear Time Series Analysis; Unstable Attractors
ID Code:109978
Deposited On:21 Dec 2017 10:59
Last Modified:21 Dec 2017 10:59

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