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Daw CS, Finney CE, Kaul BC, et al. Characterizing dilute combustion instabilities in a multi-cylinder spark-ignited engine using symbolic analysis. Philos Trans A Math Phys Eng Sci. 2015;373(2034)doi: 10.1098/rsta.2014.0088.
Daw, C. S., Finney, C. E., Kaul, B. C., Edwards, K. D., & Wagner, R. M. (2015). Characterizing dilute combustion instabilities in a multi-cylinder spark-ignited engine using symbolic analysis. Philosophical transactions. Series A, Mathematical, physical, and engineering sciences, 373(2034), . https://doi.org/10.1098/rsta.2014.0088
Daw, C S, et al. "Characterizing dilute combustion instabilities in a multi-cylinder spark-ignited engine using symbolic analysis." Philosophical transactions. Series A, Mathematical, physical, and engineering sciences vol. 373,2034 (2015). doi: https://doi.org/10.1098/rsta.2014.0088
Daw CS, Finney CE, Kaul BC, Edwards KD, Wagner RM. Characterizing dilute combustion instabilities in a multi-cylinder spark-ignited engine using symbolic analysis. Philos Trans A Math Phys Eng Sci. 2015 Feb 13;373(2034). doi: 10.1098/rsta.2014.0088. PMID: 25548262.
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Philos Trans A Math Phys Eng Sci. 2015 Feb 13;373(2034). doi: 10.1098/rsta.2014.0088.

Characterizing dilute combustion instabilities in a multi-cylinder spark-ignited engine using symbolic analysis.

Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

C S Daw, C E A Finney, B C Kaul, K D Edwards, R M Wagner

Affiliations

  1. Fuels, Engines, and Emissions Research Center, Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA [email protected].
  2. Fuels, Engines, and Emissions Research Center, Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

PMID: 25548262 DOI: 10.1098/rsta.2014.0088

Abstract

Spark-ignited internal combustion engines have evolved considerably in recent years in response to increasingly stringent regulations for emissions and fuel economy. One new advanced engine strategy ustilizes high levels of exhaust gas recirculation (EGR) to reduce combustion temperatures, thereby increasing thermodynamic efficiency and reducing nitrogen oxide emissions. While this strategy can be highly effective, it also poses major control and design challenges due to the large combustion oscillations that develop at sufficiently high EGR levels. Previous research has documented that combustion instabilities can propagate between successive engine cycles in individual cylinders via self-generated feedback of reactive species and thermal energy in the retained residual exhaust gases. In this work, we use symbolic analysis to characterize multi-cylinder combustion oscillations in an experimental engine operating with external EGR. At low levels of EGR, intra-cylinder oscillations are clearly visible and appear to be associated with brief, intermittent coupling among cylinders. As EGR is increased further, a point is reached where all four cylinders lock almost completely in phase and alternate simultaneously between two distinct bi-stable combustion states. From a practical perspective, it is important to understand the causes of this phenomenon and develop diagnostics that might be applied to ameliorate its effects. We demonstrate here that two approaches for symbolizing the engine combustion measurements can provide useful probes for characterizing these instabilities.

© 2014 The Author(s) Published by the Royal Society. All rights reserved.

Keywords: combustion; engine; symbolic analysis; time series

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