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Optimization of Injection Timing and Injection Duration of a Diesel Engine Running on Pure Biodiesel SME (Soya Methyl Ester)

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Document pages: 17 pages

Abstract: Thisstudy was carried out to predict the impact of injection timing and injectionduration on engine brake power and Nitrogen Oxides emissions in a diesel engineusing biofuel Soya Methyl Ester (SME). Predictions were accomplished at threedifferent injection timings 10°, 5° Crank Angle (CA) before Top Dead Center(bTDC) and 0° CA at Top Dead Center (TDC) and four injection durations 20°, 25°,30°, 35° CA. The study was conducted using a simulation software (Diesel-RK).The predicted results showed that the powers producedby all the setups of the different injection timings are almost equal, but they differ in injection durations, e.g. the power atsetup (10° CA-bTDC) duration 20° CA and 2500 rpm equal to 52 kW, at setup (5° CA-bTDC)duration 25° CA and same engine speed the power is equal to 51 kW, and at setup(0° CA-TDC) durations 30° the power is equal to 51 kW. The power in all setupsare decreased as the injection duration increased, e.g. at setup 0° CA TDCdurations 25°, 35°, and 40° CA and at 4000 rpm, the brake powers are equal 71,65, and 59 kW respectively, thus the reduction percentages are 9 and 17 whencompared to the 25° injection duration. The nitrogen oxides emissions decreasedas the injection duration is increased, e.g. the emissions at setup (10° CA-bTDC)durations 25°, 30°, and 40° CA and at 2500 rpm are equal 852, 589, 293 ppmrespectively, the reduction percentages are 30 and 72 . The variations ofinjection timing and injection duration have taken a weighty influence on engine performance and emissions. Theresults are considered as a novelty in the field of using pure biofuel Soya MethylEster in diesel engine according to our information.

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