Investigation on blending higher alcohol with diesel in a direct injection compression ignition engine

The present investigation attempts to obtain simultaneous reduction of emission by means of combustion of minimum exhaust gas recirculation and diesel fuel reformulation to enable a moderately premixed lower temperature combustion style in Direct Injection C.I engine. Three higher alcohol/diesel combinations n-butanol, n-propanol, n- pentanol is 40% blended with diesel is prepared and tested under zero to high load. The same three blends are also investigated under the combination of exhaust gas recirculation rates (20%) at zero to high loads. The act as well as emissions characteristic of the engine are observed. The output indicates that blended diesel gives a longer ignition delay. The maximum pressure and maximum premixed heat release rate than diesel. Higher alcohol has fine lenience and best control of NOx, HC trade-off when compare to diesel. At 20% of EGR higher alcohol presented even ore reduction of NOx, HC emission in diesel blend but a small drop in performance as compared with normal diesel. It was observed that blended diesel presented best dominance in emission characteristics than diesel. The combination of lower exhaust gas recirculation and higher alcohol/diesel blend can obtain partially low temperature combustion and decrease NOx, HC and smoke emissions instantaneously.