Abstract
Alternatives of fossil fuel resources as renewable biodiesel fuel and alcohols represents latest technology to be developed associated with the declining of fossil fuel resources along with higher crude oil price. In this study, four-stroke, single cylinder, and direct injection diesel engine performance and emissions are evaluated. The engine was running at variable speeds (1600-3000 rpm). 15% and 25% of pentanol and heptanol were added to the diesel-biodiesel mixture. The experimental results showed increasing in brake specific fuel consumption with the increasing of higher mass fractions of alcohol blends, which is attributed to the decreasing the lower heating value (LHV) of the blends. Higher brake thermal efficiency compared to diesel fuel was produced. An expressive reduction in carbon monoxide (CO) of (16.1% - 46.6% vol.) with total unburned hydrocarbons (UHC) decrease of (7.4% - 25.3% ppm), and nitric oxides (NOx) of (8.5% - 23.5% ppm). Biodiesel and alcoholic blends are suitable to be used as alternatives to diesel without the need for any modifications in conventional diesel engines.
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