Abstract:
In the present study, combustion and emissions characteristics of a dual fuel engine has been investigated numerically.
For numerical analysis, zero dimensional stochastic reactor model (0-D SRM) approach was used. SRM
was validated with experimental results and used for parametric analysis of dual fuel engine by varying operating
parameters such as premixing ratio of fuels, engine speed and exhaust gas recirculation (EGR) percentage.
Numerically obtained results from 0-D SRM were found in good agreement with the experimental results.
Combustion process in dual fuel engine has also been analysed using computational fluid dynamics (CFD) model
using a commercial 3-D CFD engine simulation tool ‘STAR-CD’ in conjunction with mesh generator ‘es-ice’.
During engine combustion simulation with the STAR-CD code, PVM−MF (progress variable model – multi fuel)
combustion model was used, which specially developed to characterize the multi fuel combustion. Spray evolution
and combustion process has been analysed in a sector of engine cylinder to reduce the computational time
during simulations. Numerically simulated data using this model was also found in good agreement with the
experimental data. It was found that engine performance improved at higher engine load conditions and carbon
mono oxide as well as unburned hydrocarbon emissions reduced. Effect of EGR on combustion and performance
characteristics of dual fuel engine was also analysed.
