Transient combustion process of an IDI diesel engine with dual-throat jet at cold-starting

Conference · Sun Sep 01 04:00:00 EDT 1996

OSTI ID:287769

Li, D; Zhu, X; He, X; Peng, L

The dual-throat jet technique has been successfully used to improve cold-starting of the swirl-type IDI diesel engines. It has been proven that, with the aid of the second throat connecting the swirl chamber and the main combustion chamber, the cold-starting process was more stable, quieter and cleaner. An intensive fundamental experimental investigation of the transient process of the ignition and combustion at cold-starting has-been conducted on a swirl-chamber IDI diesel engine with the help of high-speed photography. Based on the results of this investigation, the following conclusions have been made: (1) there exist three types of heat release rate pattern at the cold-starting, different patterns will result in different engine behavior; (2) the secondary throat has two effects on the engine starting characteristics: (a) improvement of the ignition conditions in the main chamber by directly delivering pilot fuel; (b) improvement of the fuel/air mixing process by intensifying turbulence in the swirl chamber, which depends on the geometrical shape and orientation of the throat; (3) the counter stream of air against the fuel spray accelerates dispersion and atomization of the fuel spray in the swirl chamber. It plays the primary role in assisting the cold starting of the engine.

• OSTI ID: 287769
• Report Number(s): CONF-960204--; ISBN 1-56091-789-X
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
COMBUSTION HEAT
COMBUSTION INSTABILITY
COMBUSTION KINETICS
DIESEL ENGINES
DIESEL FUELS
FLOW VISUALIZATION
FUEL-AIR RATIO
JETS
START-UP
TRANSIENTS
TURBULENT FLOW
VORTEX FLOW