Description and Analysis of Diesel Engine Rate of Combustion and Performance Using Wiebe's Functions 850107
Two laboratory engines, one direct, injection and one indirect injection, were operated for a range of speeds, loads, injection timings, fuels, and steady and transient conditions. Rate of combustion data were derived and analyzed using a double Wiebe's function approximation. It is shown that three of the six function parameters are constant for a wide range of conditions and that the other three can be expressed as linear functions of the amount of fuel injected during ignition lag. Engine noise, smoke, and thermal efficiency correlate with the parameters describing the amount of premixed combustion and diffusive combustion duration. These characteristics may be optimized by reducing the quantity of premixed combustion while maintaining the duration of diffusive combustion to less than 60°CA.
Citation: Miyamoto, N., Chikahisa, T., Murayama, T., and Sawyer, R., "Description and Analysis of Diesel Engine Rate of Combustion and Performance Using Wiebe's Functions," SAE Technical Paper 850107, 1985, https://doi.org/10.4271/850107. Download Citation
Noboru Miyamoto, Takemi Chikahisa, Tadashi Murayama, Robert Sawyer
Hokkaido University, University of California-Berkeley
SAE International Congress and Exposition
Combustion, Emission and Analysis-P-162, SAE 1985 Transactions-V94-85