الفهرس 
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Abstract
This study focuses on using alumina nanoparticles (NPs) and stoichiometric-oxygen-hydrogen (SOH) gas from water electrolyzer as fuel additives. The engine experiments were performed using a 4-stroke, single-cylinder, air-cooled, direct injection diesel engine at 2000 rpm and different loads. Four different concentrations of alumina NPs were used (25, 50, 75 and 100 mg/l) while a constant flowrate of 0.2 l/min of SOH was used. Two base fuels, diesel (D100) and 30% biodiesel + 70% diesel (B30), were considered. Minimum reduction by 6.8% and 15.6% in break specific fuel consumption were noticed for 75 mg/l of alumina NPs in in D100 and B30, respectively. A 55% average reduction in break specific fuel consumption was achieved by addition of SOH to D100. For D100-SOH, the break specific fuel consumption was noticed to increase with the addition of alumina NPs. The addition of SOH gas to B30 reduced break specific fuel consumption by 8% compared to B30. The addition of alumina NPs to B30-SOH fuel increased break specific fuel consumption. The addition of alumina NPs to D100 increased (NOx) emissions by 12% while a 28% reduction was noticed with the addition of SOH. For B30 and B30-SOH base fuels, scattered profiles of (NOx) were monitored.