Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability

Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability

Combustion noise has been traditionally thought of as stochastic fluctuations present in the background of the dynamics in combustors amongst the flow, heat release and the chamber acoustics. Through a series of determinism tests, we show that these aperiodic fluctuations are in fact chaotic of mode...

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Main Authors: Vineeth Nair, Gireehkumaran Thampi, Sulochana Karuppusamy, Saravanan Gopalan, R. I. Sujith
Format: Article
Language:English
Published: SAGE Publishing 2013-12-01
Series:International Journal of Spray and Combustion Dynamics
Online Access:https://doi.org/10.1260/1756-8277.5.4.273
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spelling doaj-f0afbc3f795f49f2bfdbbd2288775dd12020-11-25T03:03:23ZengSAGE PublishingInternational Journal of Spray and Combustion Dynamics1756-82771756-82852013-12-01510.1260/1756-8277.5.4.27310.1260_1756-8277.5.4.273Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion InstabilityVineeth Nair0Gireehkumaran Thampi1Sulochana Karuppusamy2Saravanan Gopalan3R. I. Sujith4 National Centre for Combustion Research and Development, Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai - 36, India National Centre for Combustion Research and Development, Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai - 36, India Central Electronics Centre, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai - 36, India Central Electronics Centre, Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai - 36, India National Centre for Combustion Research and Development, Department of Aerospace Engineering, Indian Institute of Technology Madras, Chennai - 36, IndiaCombustion noise has been traditionally thought of as stochastic fluctuations present in the background of the dynamics in combustors amongst the flow, heat release and the chamber acoustics. Through a series of determinism tests, we show that these aperiodic fluctuations are in fact chaotic of moderately high dimensions ( d 0 ≅ 8–10). These chaotic fluctuations then transition to high amplitude combustion instability when the operating conditions are varied towards leaner equivalence ratios. Precursors to such a transition from chaos to dynamics dominated by periodic oscillations are of interest to designers and operators of combustors in estimating the boundaries of operability. We introduce a test for chaos, known as 0–1 test for chaos in the literature, as a measure of the proximity of the combustor to an impending instability. The measure is robust and shows a smooth transition for variation in flow conditions towards instability enabling thresholds to be set for operational boundaries.https://doi.org/10.1260/1756-8277.5.4.273
collection DOAJ
language English
format Article
sources DOAJ
author Vineeth Nair
Gireehkumaran Thampi
Sulochana Karuppusamy
Saravanan Gopalan
R. I. Sujith
spellingShingle Vineeth Nair
Gireehkumaran Thampi
Sulochana Karuppusamy
Saravanan Gopalan
R. I. Sujith
Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability
International Journal of Spray and Combustion Dynamics
author_facet Vineeth Nair
Gireehkumaran Thampi
Sulochana Karuppusamy
Saravanan Gopalan
R. I. Sujith
author_sort Vineeth Nair
title Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability
title_short Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability
title_full Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability
title_fullStr Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability
title_full_unstemmed Loss of Chaos in Combustion Noise as a Precursor of Impending Combustion Instability
title_sort loss of chaos in combustion noise as a precursor of impending combustion instability
publisher SAGE Publishing
series International Journal of Spray and Combustion Dynamics
issn 1756-8277
1756-8285
publishDate 2013-12-01
description Combustion noise has been traditionally thought of as stochastic fluctuations present in the background of the dynamics in combustors amongst the flow, heat release and the chamber acoustics. Through a series of determinism tests, we show that these aperiodic fluctuations are in fact chaotic of moderately high dimensions ( d 0 ≅ 8–10). These chaotic fluctuations then transition to high amplitude combustion instability when the operating conditions are varied towards leaner equivalence ratios. Precursors to such a transition from chaos to dynamics dominated by periodic oscillations are of interest to designers and operators of combustors in estimating the boundaries of operability. We introduce a test for chaos, known as 0–1 test for chaos in the literature, as a measure of the proximity of the combustor to an impending instability. The measure is robust and shows a smooth transition for variation in flow conditions towards instability enabling thresholds to be set for operational boundaries.
url https://doi.org/10.1260/1756-8277.5.4.273
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AT sulochanakaruppusamy lossofchaosincombustionnoiseasaprecursorofimpendingcombustioninstability
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