Fuel-air mixing and diesel combustion in a rapid compression machine
The influence of charge motion and fuel injection characteristics on diesel combustion was studied in a rapid compression machine (RCM), a research apparatus that simulates the direct-injection diesel in-cylinder environment. An experimental data base was generated in which inlet air flow conditions (temperature, velocity, swirl level) and fuel injection pressure were independently varied. High-speed movies using both direct and shadowgraph photography were taken at selected operating conditions. Cylinder pressure data were analyzed using a one-zone heat release model to calculate ignition delay times, premixed and diffusion burning rates, and cumulative heat release profiles. The photographic analysis provided data on the liquid and vapor penetration rates, fuel-air mixing, ignition characteristics, and flame spreading rates. Results show that charge temperature is the most significant parameter controlling the ignition delay period and it significantly affects the heat release profile in the premixed combustion phase.
- OSTI ID:
- 6447542
- Report Number(s):
- CONF-880241-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330102* -- Internal Combustion Engines-- Diesel
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
DIESEL ENGINES
ENGINES
FLAMES
FLUID FLOW
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUEL-AIR RATIO
HEAT ENGINES
IGNITION
INTERNAL COMBUSTION ENGINES
KINETICS
MIXING
MONITORING
PHOTOGRAPHY
REACTION KINETICS
SIMULATION
VORTEX FLOW