The effect of intake charge temperature on combustion and emissions in an optically accessible DI diesel engine with and without swirl
An optically accessible Dl diesel engine has been constructed to study combustion, emission, spray, and flow field phenomena. The goal of the present investigation is to study the effect that intake charge temperature variation at constant density has on combustion, emissions, and spray vaporization in both quiescent and swirling environments. The results indicate that raising intake temperatures decreased the ignition delay, peak rate of premixed burning, and premixed fraction. Increasing intake temperature increased the peak rate of diffusion burning in the quiescent environment, but mixing effects balanced temperature effects in the swirl environment and peak diffusion burning remained constant. In general, NO{sub x} increased with increasing temperature and amount of diffusion burning, but lower temperature data suggests that premixed and diffusion burning are both contributing to NO production. Combustion photography shows that first visible light occurs very close to start of combustion and typically before peak premixed burning which indicates the visible light is emitted in the premixed stage of combustion. Under nonfiring conditions, shadowgraph photography indicates that increasing intake temperature had little effect on fuel plume penetration to the walls, however, swirl has a dramatic effect on tangential fuel distribution.
- OSTI ID:
- 5778097
- Report Number(s):
- CONF-9010205--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330102* -- Internal Combustion Engines-- Diesel
330701 -- Emission Control-- Nitrogen Oxides
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DIESEL ENGINES
DIFFUSION
DISTRIBUTION
EMISSION
ENGINES
FUELS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOGRAPHY
THERMOCHEMICAL PROCESSES