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An Experimental Investigation on Spray Characteristics of Waste Cooking Oil, Jatropha, and Karanja Biodiesels in a Constant Volume Combustion Chamber

机译:恒定燃烧室中废物烹饪油,麻风法和Karanja生物柴油喷雾特性的实验研究

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摘要

In this study, macroscopic spray characteristics of Waste cooking oil (WCO), Jatropha oil, Karanja oil based biodiesels and baseline diesel were compared under simulated engine operating condition in a constant volume spray chamber (CVSC). The high pressure and high temperature ambient conditions of a typical diesel engine were simulated in the CVSC by performing pre-ignition before the fuel injection. The spray imaging was conducted under absence of oxygen in order to prevent the fuels from igniting. The ambient pressure and temperature for non-evaporating condition were 3 MPa and 300 K. Meanwhile, the spray tests were performed under the ambient pressure and temperature of 4.17 MPa and 804 K under evaporating condition. The fuels were injected by a common-rail injection system with injection pressure of 80 MPa. High speed Mie-scattering technique was employed to visualize the evaporating sprays. Liquid tip penetration length, spray cone angle and spray area were determined from captured images. The equivalence ratio along the axial direction of the spray was also calculated based on mathematical correlations. Results showed that biodiesels had longer spray tip penetration length and narrow spray cone angle than those of baseline diesel. Amongst the biodiesels, Jatropha and Karanja biodiesels exhibited longer spray tip penetration length and narrower spray angle than those of Waste cooking oil biodiesel. On the other hand, baseline diesel showed much shorter liquid tip penetration length and faster evaporation process than biodiesels. The reason is that higher density and viscosity of biodiesels attenuated the fuel atomization and evaporation process. However, despite deteriorated atomization characteristics, biodiesels showed lower equivalence ratio than baseline diesel due to inherent oxygen content in the fuel molecules.
机译:在该研究中,在恒定体积喷雾室(CVSC)中的模拟发动机运行条件下比较了废物烹饪油(WCO),麻风树油,卡拉诺油基的生物柴油和基线柴油的宏观喷射特性。通过在燃料喷射前进行预点火在CVSC中模拟典型柴油发动机的高压和高温环境条件。在不存在氧气的情况下进行喷雾成像以防止燃料点燃。同时,非蒸发条件的环境压力和温度为3MPa和300k。同时,在蒸发条件下在4.17MPa和804k的环境压力和温度下进行喷雾试验。燃料被共同的轨道注射系统注射,注射压力为80MPa。采用高速MIE散射技术来可视化蒸发喷雾。液体尖端穿透长度,从捕获的图像确定喷雾锥角和喷射区域。还基于数学相关性计算沿喷射的轴向的等效率。结果表明,生物柴油具有比基线柴油的喷涂尖端穿透长度和窄喷雾锥角较长。在生物柴油中,麻风树和卡拉诺生物柴油呈较长的喷雾尖端穿透长度和较窄的喷射角度比废物烹饪油生物柴油的较窄。另一方面,基线柴油显示出比生物柴油更短的液体尖端穿透长度和更快的蒸发过程。原因是生物柴油的较高密度和粘度减弱了燃料雾化和蒸发过程。然而,尽管雾化特征劣化,因此由于燃料分子中的固有氧含量,生物柴油显示出比基线柴油的等效比率下降。

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