THERMAL SCIENCE

International Scientific Journal

Jeevan Tirkey

,

Hari N. Gupta

,

Shailendra Kumar Shukla

INTEGRATED GAS DYNAMIC AND THERMODYNAMIC COMPUTATIONAL MODELING OF MULTICYLINDER 4-STROKE SPARK IGNITION ENGINE USING GASOLINE AS A FUEL

ABSTRACT
This paper presents a computational tool for the evaluation of engine performance and exhaust emissions for four stroke multi-cylinder spark ignition engine which uses gasoline as a fuel. Gas dynamics flow in multi-cylinder intake and exhaust systems are modeled by using one-dimensional unsteady compressible flow equations. The hyperbolic partial differential equations are transferred into a set of ordinary differential equations by using method of characteristics and solved by finite difference method. Compatibility relationships between local fluid velocity and sonic velocity are expressed in terms of Riemann variables, which are constant along the position characteristics. The equations are solved numerically by using rectangular grid in the flow direction and time. In this model nitric oxide concentration is predicted by using the rate kinetic model in the power cycle and along the exhaust pipes. Carbon monoxide is computed under chemical equilibrium condition and then empirical adjustment is made for kinetic behaviors based upon experimental results. A good agreement is obtained in the comparison of computed and experimental results of instantaneous cylinder pressure, manifold pressure and temperature, and nitric oxide and carbon monoxide emissions level.
KEYWORDS
computer simulation, method of characteristics, Riemann variables, non-homentropic, rate kinetics, exhaust species
PAPER SUBMITTED: 2008-12-17
PAPER REVISED: 2009-03-08
PAPER ACCEPTED: 2009-05-30
DOI REFERENCE: https://doi.org/10.2298/TSCI0903113T
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2009, VOLUME 13, ISSUE Issue 3, PAGES [113 - 130]
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Integrated gas dynamic and thermodynamic computational modeling of multicylinder 4-stroke spark ignition engine using gasoline as a fuel

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence