NDLI: Development and Use of a Segregated-Solver for Detailed Modeling of End-Gas Detonation in a Lean-Burn Spark-Ignited Engine

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Scott, B. Fiveland Vijayaraghavan, Shriram Shi, Shaoping Steven, W. Richardson Michael, H. Mcmillian Joel, D. Hiltner
Copyright Year	2010
Abstract	End-gas detonation occurs in a spark-ignited engine when the advancing flame front compresses the end-gas mixture to its autoignition temperature. The rapid energy release results in shock waves which are undesirable due to resulting combustion noise and boundary layer breakdown leading to reduced engine performance and incipient engine damage. In a spark-ignited engine, end-gas knock can result from improper combinations of compression ratio, spark timing or inlet thermodynamic conditions (i.e. manifold temperature, pressure, and equivalence ratio). These variables exhibit very complex interactions, which require costly high dimensional experimental designs for proper evaluation. As a result, detailed modeling tools are needed to predict the onset of the end-gas detonation regime for engine design applications. Developing a solver to predict the end-gas detonation of gases ahead of the flame front in an operating engine is not trivial. In theory, the model would need to simultaneously resolve both the detailed fluid mechanics as well as describe the fuel decomposition using detailed chemistry. Calculations for this type can take weeks or months depending on the number of dimensions that are resolved. Since hundreds of computations may be necessary to optimize a given configuration, it is necessary to be able to not only compute the onset of auto-ignition and other parameters accurately, but efficiently. The objective of this work was to develop an efficient methodology that could be utilized to effectively predict detonation in an internal combustion spark-ignited engine. This paper presents the computational methodology, a review of the combustion tool capability, and a comparison to experiments. The work clearly demonstrates the existence of inhomogeneities in the temperature field and discusses their impact on the prediction of end-gas knock.
Sponsorship	Internal Combustion Engine Division
Starting Page	999
Ending Page	1007
Page Count	9
File Format	PDF
ISBN	9780791849446
DOI	10.1115/ICEF2010-35109
e-ISBN	9780791838822
Conference Proceedings	ASME 2010 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2010-09-12
Publisher Place	San Antonio, Texas, USA
Access Restriction	Subscribed
Subject Keyword	Fluid mechanics Temperature Compression Engine design Ignition Dimensions Explosions Combustion Fuels Modeling Pressure Engines Manifolds Noise (sound) Gases Shock waves Flames Chemistry Computation Experimental design Damage Boundary layers
Content Type	Text
Resource Type	Article

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