摘要
This study was carried out to predict the impact of injection timing and injection duration on engine brake power and Nitrogen Oxides emissions in a diesel engine using biofuel Soya Methyl Ester (SME). Predictions were accomplished at three different injection timings 10<span style="white-space:nowrap;">°</span>, 5<span style="white-space:nowrap;">°</span> Crank Angle (CA) before Top Dead Center (bTDC) and 0<span style="white-space:nowrap;">° </span>CA at Top Dead Center (TDC) and four injection durations 20<span style="white-space:nowrap;">°</span>, 25<span style="white-space:nowrap;">°</span>, 30<span style="white-space:nowrap;">°</span>, 35<span style="white-space:nowrap;">°</span> CA. The study was conducted using a simulation software (Diesel-RK). The predicted results showed that the power<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">s</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> produced by all the setups of the different injection timings </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">are</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> almost equal, but they differ in injection durations, e.g. the power at setup (10<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">bTDC) duration 20<span style="white-space:nowrap;">°</span> CA and 2500 rpm equal to 52 kW, at setup (5<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">bTDC) duration 25<span style="white-space:nowrap;">° </span>CA and same engine speed the power is equal to 51 kW, and at setup (0<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">TDC) durations 30<span style="white-space:nowrap;">°</span> the power is equal to 51 kW. The power in all setups are decreased as the injection duration increased, e.g. at setup 0<span style="white-space:nowrap;">°</span> CA TDC durations 25<span style="white-space:nowrap;">°</span>, 35<span style="white-space:nowrap;">°</span>, and 40<span style="white-space:nowrap;">°</span> CA and at 4000 rpm, the brake powers are equal 71, 65, and 59 kW respectively, thus the reduction percentages are 9% and 17% when compared to the 25<span style="white-space:nowrap;">°</span> injection duration. The nitrogen oxides emissions decreased as the injection duration is increased, e.g. the emissions at setup (10<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">bTDC) durations 25<span style="white-space:nowrap;">°</span>, 30<span style="white-space:nowrap;">°</span>, and 40<span style="white-space:nowrap;">°</span> CA and at 2500 rpm are equal 852, 589, 293 ppm respectively, the reduction percentages are 30% and 72%. The variations of injection timing and injection duration </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">have </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">taken a weighty influence on engine performance and emissions. The results </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">are</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> considered as a novelty in the field of using pure biofuel Soya Methyl Ester in diesel engine according to our information.</span></span></span>
This study was carried out to predict the impact of injection timing and injection duration on engine brake power and Nitrogen Oxides emissions in a diesel engine using biofuel Soya Methyl Ester (SME). Predictions were accomplished at three different injection timings 10<span style="white-space:nowrap;">°</span>, 5<span style="white-space:nowrap;">°</span> Crank Angle (CA) before Top Dead Center (bTDC) and 0<span style="white-space:nowrap;">° </span>CA at Top Dead Center (TDC) and four injection durations 20<span style="white-space:nowrap;">°</span>, 25<span style="white-space:nowrap;">°</span>, 30<span style="white-space:nowrap;">°</span>, 35<span style="white-space:nowrap;">°</span> CA. The study was conducted using a simulation software (Diesel-RK). The predicted results showed that the power<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">s</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> produced by all the setups of the different injection timings </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">are</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> almost equal, but they differ in injection durations, e.g. the power at setup (10<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">bTDC) duration 20<span style="white-space:nowrap;">°</span> CA and 2500 rpm equal to 52 kW, at setup (5<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">bTDC) duration 25<span style="white-space:nowrap;">° </span>CA and same engine speed the power is equal to 51 kW, and at setup (0<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">TDC) durations 30<span style="white-space:nowrap;">°</span> the power is equal to 51 kW. The power in all setups are decreased as the injection duration increased, e.g. at setup 0<span style="white-space:nowrap;">°</span> CA TDC durations 25<span style="white-space:nowrap;">°</span>, 35<span style="white-space:nowrap;">°</span>, and 40<span style="white-space:nowrap;">°</span> CA and at 4000 rpm, the brake powers are equal 71, 65, and 59 kW respectively, thus the reduction percentages are 9% and 17% when compared to the 25<span style="white-space:nowrap;">°</span> injection duration. The nitrogen oxides emissions decreased as the injection duration is increased, e.g. the emissions at setup (10<span style="white-space:nowrap;">°</span> CA</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">-</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">bTDC) durations 25<span style="white-space:nowrap;">°</span>, 30<span style="white-space:nowrap;">°</span>, and 40<span style="white-space:nowrap;">°</span> CA and at 2500 rpm are equal 852, 589, 293 ppm respectively, the reduction percentages are 30% and 72%. The variations of injection timing and injection duration </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">have </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">taken a weighty influence on engine performance and emissions. The results </span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">are</span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;"> considered as a novelty in the field of using pure biofuel Soya Methyl Ester in diesel engine according to our information.</span></span></span>
作者
Abdullah Alghafis
Eihab A. Raouf
Abdullah Alghafis;Eihab A. Raouf(Mechanical Engineering Department, Unaizah Engineering College, Qassim University, Unaizah, KSA)