Effect of Biodiesel-ethanol Fuel Blends on Performance and Combustion Characteristics in a Small Diesel Engine during Start of Engine
Keywords:
Combustion, Ethanol, Biodiesel, CI engineAbstract
The climate change is considered to be the high levels of greenhouse gas caused by the combustion of petroleum fuel. Using renewable fuel is a way to reduce the greenhouse gas. Ethanol is one of the most common renewable energy. This work aims to study the combustion characteristics of ethanol with various concentrations of ignition improver, bio-diesel, during start-up condition. A modified diesel engine with a compression ratio of 23 is tested under a controlled room condition. Bio-diesel is used as ignition improver from 2 to 40%. It was found that ethanol with a minimum of 18% bio-diesel can start the engine. The results from the ethanol combustion analysis show that there are fewer variations of the start of injection (SOI) and start of combustion (SOC) for increasing the concentration of ignition improvers. The increased concentrations of ignition improvers reduced ignition delay (ID) and the number of misfire cycles in the engine during start-up period. Increasing the percentage of bio-diesel by 40%, the number of misfire cycles is reduced. However, the number of misfire cycles is still large compared to diesel fuel.
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