Investigation of the Performance and Emission Character Biodiesel-Diesel Blends in Direct Injection Diesel Engines

Hadish Teklehaimanot Gebru

doi:10.20372/ejssdastu:v10.i2.2023.704

Hadish Teklehaimanot Gebru ASTU

DOI: https://doi.org/10.20372/ejssdastu:v10.i2.2023.704

Keywords: Biodiesel blends, Emission, Jatropha curcas, Performance, and Transesterification

Abstract

The emission and performance attributes of a mono-cylinder direct injection variable compression test engine were explored using Jatropha curcas as a feedstock for biodiesel production. Two-step techniques, esterification and transesterification, were employed to create biodiesel with diesel fuel-like properties. In the first phase esterification process, the molar ratio of methanol to the parent oil Jatropha curcas was 1:6, and 1% volume of sulphuric acid was added. The mixture was maintained at 65 degrees Celsius, and the magnetic stirrer on the hotplate was adjusted to 600 rpm. At this point, the acid value reduced from 4.6mg-KOH/g-oil to 1mg-KOH/g-oil. During the second transesterification procedure, the catalysts were sodium hydroxide pellets and analytical grade methanol at the same stirring speed and mixture temperature for 25 minutes. The emission as well as performance characteristics of biodiesel-diesel blends containing various mixing ratios were studied. The test samples B₂₀, B₁₀₀produced less carbon monoxide and hydrocarbon as compared to the baseline diesel fuel, and the power, and torque outputs of B₂₀ were superior to all blends. The study's unexpected conclusion was that increasing the blend's biodiesel component increases braking power and torque while decreasing brake-specific fuel consumption.

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