Development of Improved Thermodynamic Model Using Cylinder Blow by and Double-Wiebe Functions for High Speed Diesel Engine 2018-01-0244
In the present work, a tuned gas dynamics based blow by model was used for prediction of thermodynamic state variables till start of combustion in a high speed diesel engine. The burn rate fraction was determined from experimental pressure trace using Rassweiller-Withrow method. Furthermore, suitable single and double Wiebe parameters, consistent with the experimental combustion behavior were determined statistically. The comparison with experimental heat release and burn rate fraction confirmed the unsuitability of single Wiebe function for diesel combustion. A stochastic zero-dimensional thermodynamic model was used to predict pressure traces for various load/fueling conditions. The results exhibited a sub-15% error margin between predicted and experimental pressure traces across all crank angles and fuelling rates. Finally, the model constants are proposed as a function of non-dimensional fuelling rate.
Citation: Valecha, P., Mishra, C., Subbarao, P., and Das, P., "Development of Improved Thermodynamic Model Using Cylinder Blow by and Double-Wiebe Functions for High Speed Diesel Engine," SAE Technical Paper 2018-01-0244, 2018, https://doi.org/10.4271/2018-01-0244. Download Citation
Puneet Valecha, Chinmaya Mishra, PMV Subbarao, Pranab Das
Indian Institute of Technology, CSIR-Indian Institute of Petroleum