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Kinetic Modelling Study of Octane Number and Sensitivity of Hydrocarbon Mixtures in CFR Engines
Technical Paper
2005-24-077
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Language:
English
Abstract
Aim of this work is to present and discuss the possibility and
the limits of two zone models for spark-ignition engines using a
detailed kinetic scheme for the characterization of the evolution
of the air-fuel mixture, while an equilibrium approach is used for
the burnt zone. Simple experimental measurements of knocking
tendency of different fuels in ideal reactors, such as rapid
compression machines and shock tube reactors, cannot be directly
used for the analysis of octane numbers and sensitivity of
hydrocarbon mixtures. Thus a careful investigation is very useful,
not only of the combustion chamber behavior, including the
modelling of the turbulent flame front propagation, but also of the
fluid dynamic behavior of the intake and exhaust system, accounting
for the volumetric efficiency of the engine.
Research and Motor Octane Numbers are evaluated by numerical
simulations based on a quasi-dimensional, two-zone combustion model
embedded in a 1D thermo-fluid dynamic code, in which detailed
kinetic schemes in the unburnt mixture has been introduced. Finally
the effects of different mixture components are discussed on the
basis of preliminary comparisons with experimental data.
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Authors
- M. Mehl - Politecnico di Milano
- T. Faravelli - Politecnico di Milano
- E. Ranzi - Politecnico di Milano
- F. Giavazzi - Enitecnologie San Donato (Milano)
- P. Scorletti - Enitecnologie San Donato (Milano)
- D. Terna - Enitecnologie San Donato (Milano)
- G. D'Errico - Politecnico di Milano
- T. Lucchini - Politecnico di Milano
- A. Onorati - Politecnico di Milano