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Title: Further insights into SI four-stroke combustion using flame imaging

Abstract

In this paper direct flame imaging is used to study the initial and final phases of lean combustion in a spark-ignition four-stroke optical engine. Changes in the flame size, shape, and location are used to infer flows in each cycle that have caused these flame characteristics. Flame images after dual simultaneous ignition together with images of the very early flame kernel after signal ignition show that large-scale flows past the spark plug are a major controlling factor for flame growth at lean operating conditions. In the absence of these flows, cooling by the adjoining spark-plug structure decreases the initial flame growth rate. For slow-burning cycles, images of combustion completion near the wall taken through the transparent cylinder show that the flame has a great deal of spatial structure, and some of the large scale nonuniformities are repeatable. Bulk flame quenching due to the gas expansion from piston motion did not occur, demonstrated by images of flames at piston bottom-dead-center.

Authors:
 [1]
  1. Engine Research Dept., General Motors Research Lab., Warren, MI (US)
Publication Date:
OSTI Identifier:
5902920
Resource Type:
Journal Article
Journal Name:
Combustion and Flame; (United States)
Additional Journal Information:
Journal Volume: 85:3; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; 02 PETROLEUM; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; FLAMES; IMAGES; SPARK IGNITION ENGINES; COMBUSTION KINETICS; FLAME PROPAGATION; FUEL-AIR RATIO; IGNITION SYSTEMS; SHAPE; SIZE; CHEMICAL REACTION KINETICS; ENGINES; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; KINETICS; REACTION KINETICS; 330101* - Internal Combustion Engines- Spark-Ignition; 025000 - Petroleum- Combustion; 400800 - Combustion, Pyrolysis, & High-Temperature Chemistry

Citation Formats

Bates, S C. Further insights into SI four-stroke combustion using flame imaging. United States: N. p., 1991. Web. doi:10.1016/0010-2180(91)90138-2.
Bates, S C. Further insights into SI four-stroke combustion using flame imaging. United States. doi:10.1016/0010-2180(91)90138-2.
Bates, S C. Sat . "Further insights into SI four-stroke combustion using flame imaging". United States. doi:10.1016/0010-2180(91)90138-2.
@article{osti_5902920,
title = {Further insights into SI four-stroke combustion using flame imaging},
author = {Bates, S C},
abstractNote = {In this paper direct flame imaging is used to study the initial and final phases of lean combustion in a spark-ignition four-stroke optical engine. Changes in the flame size, shape, and location are used to infer flows in each cycle that have caused these flame characteristics. Flame images after dual simultaneous ignition together with images of the very early flame kernel after signal ignition show that large-scale flows past the spark plug are a major controlling factor for flame growth at lean operating conditions. In the absence of these flows, cooling by the adjoining spark-plug structure decreases the initial flame growth rate. For slow-burning cycles, images of combustion completion near the wall taken through the transparent cylinder show that the flame has a great deal of spatial structure, and some of the large scale nonuniformities are repeatable. Bulk flame quenching due to the gas expansion from piston motion did not occur, demonstrated by images of flames at piston bottom-dead-center.},
doi = {10.1016/0010-2180(91)90138-2},
journal = {Combustion and Flame; (United States)},
issn = {0010-2180},
number = ,
volume = 85:3,
place = {United States},
year = {1991},
month = {6}
}