Abstract
This body of work entailed the broad contrasting of two hydrocarbon fuel auto-ignition models
formulated for the emulation of combustion dynamics in Homogeneous Charge Compression
Ignition (HCCI) engines.
The first (empirical) auto-ignition model was adapted from its previously published form, for
HCCI engine model implementation. This model was then combined with an explicit, single
zone, thermodynamic engine model in order to investigate combustion phasing control
strategies over a wide range of engine design parameters, experimental conditions and
hydrocarbon fuels. This investigation yielded new techniques for HCCI combustion phasing
control using convergent control parameter values and operation along curves of constant
combustion phasing. These techniques were validated experimentally using two HCCI engines
of novel design.
The second (functional global) auto-ignition model was formulated in this study, drawing on an
analysis of chemical kinetic schematics, a detailed auto-ignition behavioural study and a critical
evaluation of existing global auto-ignition models. The performance of this new functional global
model was evaluated using detailed chemical kinetic simulation data for a variety of
hydrocarbon fuels, across a wide range of experimental conditions.
The two studies, although different in approach and scope, enabled a broad and detailed
comparison of the two auto-ignition models, thereby highlighting their respective values and
limitations. The two models were shown to each possess particular advantages in the context of
HCCI auto-ignition modelling, which were unmatched by existing models of similar
classification. The models were also shown to exhibit individual drawbacks which played to
each other’s strengths. Both models were shown to be configurable to real world, full boiling
range fuels and were designed to accurately emulate the dynamics of two-stage auto-ignition
with excellent computational efficiency.
These two hydrocarbon fuel auto-ignition models, together with the engine modelling techniques
developed in this study, represent a novel and valuable contribution to the field of HCCI engine
combustion control and effectively move this technology one incremental step closer to its
anticipated commercial realisation.
Floweday, G (2021). Two Contrasting Approaches to Auto-Ignition Modelling for HCCI Engines. Afribary. Retrieved from https://afribary.com/works/two-contrasting-approaches-to-auto-ignition-modelling-for-hcci-engines
Floweday, Gareth "Two Contrasting Approaches to Auto-Ignition Modelling for HCCI Engines" Afribary. Afribary, 15 May. 2021, https://afribary.com/works/two-contrasting-approaches-to-auto-ignition-modelling-for-hcci-engines. Accessed 04 Oct. 2024.
Floweday, Gareth . "Two Contrasting Approaches to Auto-Ignition Modelling for HCCI Engines". Afribary, Afribary, 15 May. 2021. Web. 04 Oct. 2024. < https://afribary.com/works/two-contrasting-approaches-to-auto-ignition-modelling-for-hcci-engines >.
Floweday, Gareth . "Two Contrasting Approaches to Auto-Ignition Modelling for HCCI Engines" Afribary (2021). Accessed October 04, 2024. https://afribary.com/works/two-contrasting-approaches-to-auto-ignition-modelling-for-hcci-engines