4.7 Article

Combustion investigation of waste cooking oil (WCO) with varying compression ratio in a single cylinder CI engine

Journal

FUEL
Volume 283, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119262

Keywords

Waste cooking oil (WCO); Variable compression ratio; Heat release rate (HRR); Ignition delay (ID); Combustion duration (CD)

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The study focuses on the utilization of waste cooking oil as an alternative to mineral diesel, showing that under full load conditions, waste cooking oil biodiesel has a 18% higher brake thermal efficiency compared to diesel. Peak in-cylinder pressures are similar between diesel and waste cooking oil biodiesel under the same operating conditions, but waste cooking oil biodiesel has a 6% lower BSFC for full load conditions.
Biodiesel is a popular alternative fuel of mineral diesel which is normally produced by using straight vegetable oils (SVO). Since the conversion of edible oils into biodiesel may affect its supply/availability as a food item, it is desirable to use non-edible oils for biodiesel production for a long time. Waste cooking oil (WCO) is one such non-edible oil, however superior in quality for biodiesel production through transesterification. The current study is mainly focused on the utilization of WCO as an alternative for mineral diesel in a typical agricultural compression ignition four stroke water-cooled engine. Effect of higher compression ratio (CR20) on various combustion and performance parameters such as in-cylinder pressure (P-theta), heat release rate (HRR), peak pressure (Pmax), maximum pressure rise rate (dP/d theta)max, combustion duration, combustion phasing etc. were investigated for WCO biodiesel and compared with mineral diesel. These experiments were performed for five different loading conditions (No load to full load) at 1500 rpm. Increase in compression ratio (CR) from 18 to 20 resulted in lower ignition delay for higher engine load condition which reduced by 6 CAD. Full load engine operation resulted in 32% brake thermal efficiency (BTE) for WCO biodiesel which was 18% higher than diesel. Peak in-cylinder pressures (Pmax) were observed similar for diesel and WCO biodiesel for same operating conditions except full load condition where it showed lower Pmax value. WCO biodiesel turned out to be more efficient with 6% lower BSFC for the full load operating conditions (CR20).

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