In-cylinder flame temperature, radiance and pressure measurements of diesel combustion to study the fuel molecular structure effects on particulates

Thesis/Dissertation · Tue Jan 01 00:00:00 EST 1985

OSTI ID:5057477

Ng, H K.K.

Six different fuels were tested using a single-cylinder direct injection diesel engine. The engine condition was maintained at 22/sup 0/ btdc injection timing, 0.5 equivalence ratio, 1000 rpm, naturally aspirated and medium swirl. Data taken included cylinder pressure-time, exhaust particulates and gaseous emissions. The six fuels tested were diesel No. 1 and 2 blended to give a cetane number 43.3, JP-7 with 2% aromatic content and a cetane of 57.2, two blends of one-ring (benzene-ring) aromatics and JP-7 giving cetanes of 31.3 and 41.7 and two blends of two-ring (naphthalene-ring) aromatics and JP-7 giving cetanes of 30.3 and 41.2 respectively. In-cylinder flame temperature measurements were made using a ratio-pyrometer. The five JP-7 base fuels were run at the engine condition given above but with the equivalence ratio lowered from 0.5 to 0.4. The two-ring blends had a lower flame temperature and more in-cylinder particulates (higher radiance) at the beginning of the diffusion-burning period than the corresponding cetane one-ring blends. The flame temperature was not affected significantly by the boosted pressure, but the radiance was lower during the start of diffusion burning than in the naturally aspirated case. Retarding the injection timing from 22/sup 0/ to 18/sup 0/ btdc in 1/sup 0/ CA steps increased exhaust smoke, decreased flame temperature and increased radiance during the start of diffusion burning.

• Research Organization: Wisconsin Univ., Madison (USA)
• OSTI ID: 5057477
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
DIESEL ENGINES
DIESEL FUELS
COMBUSTION
ANTIKNOCK RATINGS
EXHAUST GASES
MOLECULAR STRUCTURE
PARTICULATES
TEMPERATURE MEASUREMENT
TESTING
CHEMICAL REACTIONS
ENGINES
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
OXIDATION
PARTICLES
PETROLEUM PRODUCTS
THERMOCHEMICAL PROCESSES
WASTES
330102* - Internal Combustion Engines- Diesel
330705 - Emission Control- Particulates