Evaluation of a combustion model for the simulation of hydrogen spark-ignition engines using a CFD code

Rakopoulos, CD; Kosmadakis, GM; Pariotis, EG

dc.contributor.author	Rakopoulos, CD	en
dc.contributor.author	Kosmadakis, GM	en
dc.contributor.author	Pariotis, EG	en
dc.date.accessioned	2014-03-01T01:33:26Z
dc.date.available	2014-03-01T01:33:26Z
dc.date.issued	2010	en
dc.identifier.issn	0360-3199	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20416
dc.subject	Hydrogen	en
dc.subject	Combustion	en
dc.subject	Spark ignition	en
dc.subject	CFD model	en
dc.subject	Laminar	en
dc.subject	Turbulent	en
dc.subject.classification	Chemistry, Physical	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Environmental Sciences	en
dc.subject.classification	Physics, Atomic, Molecular & Chemical	en
dc.subject.other	LAMINAR BURNING VELOCITIES	en
dc.subject.other	PREMIXED TURBULENT COMBUSTION	en
dc.subject.other	AIR MIXTURES	en
dc.subject.other	GAS-MIXTURES	en
dc.subject.other	FLAME-KERNEL	en
dc.subject.other	IC-ENGINES	en
dc.subject.other	DIESEL	en
dc.subject.other	EMISSIONS	en
dc.subject.other	BLENDS	en
dc.subject.other	FUEL	en
dc.title	Evaluation of a combustion model for the simulation of hydrogen spark-ignition engines using a CFD code	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijhydene.2010.09.002	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijhydene.2010.09.002	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	The present work deals with the evaluation of a combustion model that has been developed in order to simulate the power cycle of hydrogen spark ignition engines The motivation for the development of such a model is to obtain a simple combustion model with few calibration constants applicable to a wide range of engine configurations incorporated in an in house CFD code using the RNG k-epsilon turbulence model The calculated cylinder pressure traces gross heat release rate diagrams and exhaust nitric oxide (NO) emissions are compared with the corresponding measured ones at various engine loads The engine used is a Cooperative Fuel Research (CFR) engine fueled with hydrogen operating at a constant engine speed of 600 rpm This model is composed of various sub models used for the simulation of combustion of conventional fuels in SI engines it has been adjusted in the current study specifically for hydrogen combustion The basic sub model incorporated for the calculation of the reaction rates is the characteristic conversion time scale method meaning that a time scale is used depending on the laminar conversion time and the turbulent mixing time, which dictates to what extent the combustible gas has reached its chemical equilibrium during a predefined time step Also the laminar and turbulent combustion velocity is used to track the flame development within the combustion chamber, using two correlations for the laminar flame speed and the Zimont/Lipatnikov approach for the modeling of the turbulent flame speed whereas the (NO) emissions are calculated according to the Zeldovich mechanism From the evaluation conducted it is revealed that by using the developed hydrogen combustion model and after adjustment of the unique model calibration constant, there is an adequate agreement with measured data (regarding performance and emissions) for the investigated conditions However there are a few more issues to be resolved dealing mainly with the ignition process and the applicability of a reliable set of constants for the emission calculations (C) 2010 Professor T Nejat Veziroglu Published by Elsevier Ltd All rights reserved	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY	en
dc.identifier.doi	10.1016/j.ijhydene.2010.09.002	en
dc.identifier.isi	ISI:000284298200045	en
dc.identifier.volume	35	en
dc.identifier.issue	22	en
dc.identifier.spage	12545	en
dc.identifier.epage	12560	en