Inderscience Publishers

Impact of ambient air temperature and injection timing on reduction of engine out emissions of DI diesel engine operating under the influence of oxygen enriched hydrogen gas

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The present experimental work is a study of the impact of ambient air temperature and the injection timing of diesel fuel on reduction of engine–out emissions of DI diesel engine, operating under the influence of oxygen enriched hydrogen gas. Here the oxygen enriched hydrogen gas was produced by the process of water electrolysis. The produced gas was aspirated into the combustion process of petroleum diesel along with intake air at the flow rate of 4.6 lpm. The results showed that the fuel consumption got decreased and simultaneously, engine–out emissions came down by the addition of oxygen enriched hydrogen gas. When the ambient air temperature was increased to 35°C, and with retarded injection timing of 19°BTDC, the brake specific energy consumption of the test engine got decreased by 10.59%, unburned hydrocarbon emission by 15.15%, and the NOX emissions by 7.62%. [Received: December 12, 2012; Accepted: July 6, 2013]

Keywords: diesel engines, electrolysis, oxygen enriched hydrogen gas, ambient air temperature, standard injection time, engine–out emissions, fuel consumption, retarded injection timing, nitrogen oxides, NOx, smoke, unburned hydrocarbon, UBHC, carbon monoxide, CO, constant volume combustion, ignition delay, fuel droplets vapourising rate, gas technology, brake specific energy consumption, engine emissions

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