Conclusions
The significiant conclusions from the experimental investigation are summarised. In this present work 20% of methanol fumigation shows increase in performance and reduction in emissions such as NOx, smoke density, PM when compare to normal diesel engine. Further continuing the study with 30% for methanol fumigation, shows the improvement in performance and further reduction emissions, 40% of methanol fumigation shows there is a marginal increase in performance and emission like NOx, PM, smoke density are reduced considerably.
The investigation carriedout again with fuel additives (EGDE) in 0.25%, 0.5% and 1.0% with neat diesel from these 0.5% EGDE shows little increase in performance and reduced emissions.
From the obtained results the final investigation carriedout with the combination of 40% methanol fumigation and 0.5% EGDE. In this, the following points were observed.
- There is marginal increase in brake thermal efficiency when compare to normal diesel engine.
- PM and smoke reduced when compare with original engine.
- During all the attempts NOx – emission lower than normal diesel engine.
- During all the attempts EGT decreased substantially as compared to normal diesel engine.
When 50% of methanol fumigation and 1% of EGDE with diesel was found experimentally performance decrease, emissions such as NOx, PM and smoke density more increased and more vibrations and knocking were observed due to incomplete combustion of fuel. From the above investigation diesel fuel cannot be completely replaced by methanol fuel in D.I. engine.