Numerical investigation on the influence of fuel enrichment and stratification in a pre-chamber on the ignition of main chamber mixture King Abdullah Univ of Science and Tech

Format:

Book

Conference/Event

Author/Creator:

Silva, Mickael, author.

Contributor:

Cenker, Emre

Hlaing, Ponnya

Im, Hong G.

Johansson, Bengt

Sanal, Sangeeth

Conference Name:

SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

To understand the fundamental mechanisms of the main chamber charge ignition in pre-chamber combustion (PCC) engines, the effects of the composition enrichment and stratification in the pre-chamber were investigated numerically using CONVERGE. A well-stirred reactor combustion model coupled with a methane oxidation mechanism reduced from GRI 3.0 was used. A closed-cycle simulation is considered and the entire domain (pre-chamber and main chamber) was initialized with λ = 1.3 at inlet valve closing time. The initial flow field was imposed by mapping the field variables obtained from a full cycle simulation, thus approximating real engine conditions. An additional amount of fuel is further injected into the pre-chamber to achieve a global λ of 0.7 and 1.0 inside the pre-chamber region at spark timing. Varying the pre-chamber λ value allows to produce jets with various compositions and topologies. It is described the influence of different jets composition on the main chamber charge ignition. A local enrichment phenomenon in the main chamber observed and described in cases which the pre-chamber was directly fueled. These variables were related to the amount of heat released in the pre-chamber, the reactive jet topology and ultimately to the global system's behavior

Notes:

Vendor supplied data

Publisher Number:

2021-01-0523

Access Restriction:

Restricted for use by site license