Effect of Relative Mixture Strength on Performance of Divided Chamber Avalanche Activated Combustion' Ignition Technique in a Heavy Duty Natural Gas Engine Lund Univ

Format:

Conference/Event

Author/Creator:

Shah, Shah, author.

Contributor:

Johansson, Bengt

Tunestal, Per

Conference Name:

SAE 2014 World Congress & Exhibition (2014-04-08 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2014

Summary:

This article deals with application of a pre-chamber type ignition device in a heavy duty engine operated with natural gas. A particular pre-chamber ignition strategy called Avalanche Activated Combustion (originally Lavinia Aktyvatsia Gorenia' in Russian), commonly referred to as LAG-ignition process, has been studied by performing a parametric study of various pre- and main chamber mixture strength combinations. This strategy was first proposed in 1966 and has been mostly applied in light duty automotive engines. A majority of published data are results from developmental studies but the fundamental mechanism of the LAG-ignition process is unclear to date. To the best of authors' knowledge, the study presented in this article is the first generalized study to gain deeper understanding of the LAG-ignition process in heavy duty engines operating with natural gas as fuel for both chambers.The experiments are performed on a single cylinder 2.1 L engine fitted with a custom made pre-chamber capable of spark ignition, fuel injection and pressure measurement. Measured cylinder pressure is used to perform heat release analysis to understand combustion in the pre-chamber and subsequent ignition and combustion of fuel-lean charge in the main chamber. Results show substantial extension in lean limit of operation and corresponding improvement in indicated efficiency by burning fuel rich in the pre-chamber. Data related to engine-out regulated emission species are also presented

Notes:

Vendor supplied data

Publisher Number:

2014-01-1327

Access Restriction:

Restricted for use by site license