An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Machrafi, Hatim; Cavadias

doi:10.1016/j.fuproc.2008.05.019

Article (Scientific journals)

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Machrafi, Hatim; Cavadias

2008 • In Fuel Processing Technology, 89 (11), p. 1218-1226

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/95019

DOI
10.1016/j.fuproc.2008.05.019

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Keywords :

Auto-ignition; HCCI engine; Inlet temperature; Equivalence ratio; Compression ratio; Kinetic mechanism

Abstract :

[en] In order to understand better the auto-ignition process in an HCCI engine, the influence of some important parameters on the auto-ignition is investigated. The inlet temperature, the equivalence ratio and the compression ratio were varied and their influence on the pressure, the heat release and the ignition delays were measured, The inlet temperature was changed from 25 to 70 degrees C and the equivalence ratio from 0.18 to 0.41, while the compression ratio varied from 6 to 13.5. The fuels that were investigated were PRF40 and n-heptane. These three parameters appeared to decrease the ignition delays, with the inlet temperature having the least influence and the compression ratio the most. A previously experimentally validated reduced surrogate mechanism, for mixtures of n-heptane, iso-octane and toluene, has been used to explain observations of the auto-ignition process. The same kinetic mechanism is used to better understand the underlying chemical and physical phenomena that make the influence of a certain parameter change according to the operating conditions. This can be useful for the control of the auto-ignition process in an HCCI engine. (C) 2008 Elsevier B.V. All rights reserved.

Disciplines :

Chemical engineering
Energy

Author, co-author :

Machrafi, Hatim

Cavadias

Language :

English

Title :

An experimental and numerical analysis of the influence of the inlet temperature, equivalence ratio and compression ratio on the HCCI auto-ignition process of Primary Reference Fuels in an engine

Publication date :

2008

Journal title :

Fuel Processing Technology

ISSN :

0378-3820

Publisher :

Elsevier Science

Volume :

Issue :

Pages :

1218-1226

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 01 July 2011

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