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Proposal of Knock Mitigation Method Through Enhancement of Local Heat Transfer Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Simulation of the Effects of Spark Timing and External EGR on Gasoline Combustion Under Knock-Limited Operation at High Speed and Load

Authors : Michal Pasternak, Corinna Netzer, Fabian Mauss, Michael Fischer, Marc Sens, Michael Riess

Published in: Knocking in Gasoline Engines

Publisher: Springer International Publishing

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Abstract

Combustion in a spark ignition engine operated at high speed and load is investigated numerically with regard to knock behavior. The study focuses on the concurrent impact of spark timing and exhaust gas recirculation (EGR) on the severity of knock. Specifically, the possibility of knock reduction through the lowering of nitrogen oxide (NO) content in the rest-gas is examined. Simulations are carried out using a stochastic reactor model of engine in-cylinder processes along with a quasi-dimensional turbulent flame propagation model and multicomponent gas-phase chemistry as gasoline surrogate. The knock-limited conditions are detected using the detonation diagram. By lowering the NO content in the external EGR the end-gas auto-ignition is suppressed. This prevents a transition to knocking combustion and enables advancing of spark timing that yields better combustion phasing. As a result, fuel economy is improved and the potential benefits of cleaning the EGR are indicated.

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previous chapter Chemical Analysis of Potential Initiating Fluid for Low-Speed Pre-ignition
next chapter Development of a Model for Predicting the Knock Boundary in Consideration of Cooled Exhaust Gas Recirculation at Full Load
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Metadata
Title
Simulation of the Effects of Spark Timing and External EGR on Gasoline Combustion Under Knock-Limited Operation at High Speed and Load
Authors
Michal Pasternak
Corinna Netzer
Fabian Mauss
Michael Fischer
Marc Sens
Michael Riess
Copyright Year
2018
Book
Knocking in Gasoline Engines

Print ISBN: 978-3-319-69759-8

Electronic ISBN: 978-3-319-69760-4

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-3-319-69760-4_8

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