This paper investigates the performance and emission characteristics of HCCI engines fueled with\noxygenated fuels (ethanol blend). A modeling study was conducted to investigate the impact of ethanol addition on\nthe performance, combustion and emission characteristics of a Homogeneous Charge Compression Ignition (HCCI)\nengine fueled by diesel. One dimensional simulation was conducted using the renowned commercial software for\ndiesel and its blend fuels with 5% (E5) and 10% ethanol (E10) (in vol.) under full load condition at variable engine\nspeed ranging from 1000 to 2750 rpm with 250 rpm increment. The model was then validated with other researcher�s\nexperimental result. Model consists of intake and exhaust systems, cylinder, head, valves and port geometries.\nPerformance tests were conducted for volumetric efficiency, brake engine torque, brake power, brake mean effective\npressure, brake specific fuel consumption, and brake thermal efficiency, while exhaust emissions were analyzed for\ncarbon monoxide (CO) and unburned hydrocarbons (HC. The results showed that blending diesel with ethanol\nincreases the volumetric efficiency, brake specific fuel consumption and brake thermal efficiency, while it decreases\nbrake engine torque, brake power and brake mean effective pressure. In term of emission characteristics, the CO\nemissions concentrations in the engine exhaust decrease significantly with ethanol as additive. But for HC emission,\nits concentration increase when apply in high engine speed. In conclusion, using Ethanol as fuel additive blend with\nDiesel operating in HCCI shows a good result in term of performance and emission in low speed but not\nrecommended to use in high speed engine. Ethanol-diesel blends need to researched more to make it commercially\nuseable.
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