Abstract
Limited fossil fuel reservoir capacity and pollution caused by them is the big problem in front of researchers. In the present paper, an attempt was made to find a solution to the same. The conventional fuel injection system was retrofitted with a simple version of the common rail direct injection system for the small diesel engine. Further, the effect of injection system parameters was observed on the performance and emission characteristics of the retrofitted common rail direct injection diesel engine. The parameters such as injection pressure, the start of pilot injection timing, the start of main injection timing and quantity of percentage fuel injection during the pilot and main injection period were considered for experimental investigation. It was observed that all the evaluated parameters were found vital for improving the engine’s performance and emission characteristics. The retrofitted common rail direct injection system shows an average 7% rise in brake thermal efficiency with economic, specific fuel consumption. At the same time, much more reduction in hydrocarbon, carbon monoxide and smoke opacity with a penalty of a slight increase in nitrogen oxides.
Highlights
Small single-cylinder diesel engines are mainly used for stationary as well as mobile applications
The reason for the same was due to high injection pressure (IP) breaks down the diesel droplet into finer which can put into a cylinder within less time as compared to a conventional low IP system, due to this; sprayed fuel is appropriately mixed with compressed air
The maximum brake thermal efficiency (BTE) was obtained at 35° CA start of main injection (SOMI), 15° CA SOMI with IP of 600 bar when a quantity of injection set as 10-90 from out of all possible combinations
Summary
Small single-cylinder diesel engines are mainly used for stationary as well as mobile applications. Exhaust gases emitted from these engines had polluted most of the cities in our country [1] Many of these engines use a mechanical fuel injection system for delivering the required quantity of fuel at the time of combustion stroke. Such a conventional injection system does not have precise control over the delay period, injection pressure, duration of injection and rate of injection. All these factors lead to fuel wastage and atmospheric pollution from small diesel engines. Researchers had tried to design and implement such an electronic injection system for small diesel engines
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