Effect of Inhomogeneities in the End Gas Temperature Field on the Autoignition in SI Engines Lund Institute of Technology

Format:

Book

Conference/Event

Author/Creator:

Hajireza, Shahrokh, author.

Conference Name:

SAE 2000 World Congress (2000-03-06 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2000

Summary:

This paper reports an onedimensional modeling procedure of the hot spot autoignition with a detailed chemistry and multispecies transport in the end gas in an SI engine. The governing equations for continuity of mass, momentum, energy and species for an onedimensional, unsteady, compressible, laminar, reacting flow and thermal fields are discretized and solved by a fully implicit method. A chemical kinetic mechanism is used for the primary reference fuels nheptane and isooctane. This mechanism contains 510 chemical reactions and 75 species. The change of the cylinder pressure is calculated from both flame propagation and piston movement. The turbulent velocity of the propagating flame is modeled by the Wiebe function. Adiabatic conditions, calculated by minimizing Gibb's free energy at each time step, are assumed behind the flame front in the burned gas. The hot spot autoignition is presented and the ignition history is discussed as variations of the calculated temperature and species in space and time. Different sample calculations have been performed, in order to allow investigation of the effect of inhomogeneities of the initial temperature and species on the autoignition in an SI engine

Notes:

Vendor supplied data

Publisher Number:

2000-01-0954

Access Restriction:

Restricted for use by site license