A new skeletal PRF kinetic model for HCCI combustion

A skeletal kinetic model for Primary Reference Fuel (PRF) with 33 species and 38 reactions has been developed for Homogeneous Charge Compression Ignition (HCCI) combustion and introduced in this paper. Low-temperature reaction scheme of the new model was based oil the reduced kinetic model for PRF by Tanaka et al. [S. Tanaka, F. Ayala, J.C.Keck, Combust. Flame. 133 (2003) 467-481] and several modifications were added. The main features of the modifications are consideration of intermediates, olefins and aldehydes. and consideration of beta-scission of alkyl radicals in parallel to the low-temperature reactions. High-temperature reaction mechanism is very simple, consists of thermal decomposition of alkyl radicals to ethylene and oxidation of ethylene and formaldehyde to products. Beta-scission and thermal decomposition of alkyl radicals to ethylene consist of five elementary reactions and one global reaction, and oxidations of ethylene and formaldehyde consist of 10 elementary reactions and two additional global reactions. Shock tube ignition delay data, intermediate profiles from gas-sampling experiments in a HCCI engine were used to develop and validate the new PRF model. And the validated results showed good agreements to the experimental data for both shock tube experiments and also gas sampling experiments in a HCCI engine. (c) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.