Abstract:
In present study, the effect of fuel premixing ratio, direct fuel injection timings and engine compression
ratio on the soot particle emissions in nano-size range from a non-road compression ignition engine is
investigated. Experiments are conducted on modified dual fuel single cylinder engine at 1500 rpm. To
run the engine in dual fuel mode, port fuel injection (PFI) system is installed by modifying intake manifold
of the engine and developing a PFI controller. Experiments are conducted for various fuel premixing
ratio of gasoline/methanol-diesel at different engine load, diesel fuel injection timing and compression
ratios. Differential mobility spectrometer based particle sizer is used for investigation of the soot particle
number-size distribution, surface area-size distribution, particle mass-size distribution and total particle
number concentration from the engine exhaust at various test conditions. Results revealed that total particle
number concentration is higher at full engine load and increases with fuel premixing ratio (especially
in case of methanol-diesel dual fuel operation). Additionally, the peak particle number and mass
concentration reduces with an increase in compression ratio of the engine.
