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首页> 外文期刊>Applied Energy >Investigations on air-fuel mixing and flame characteristics of biodiesel fuels for diesel engine application
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Investigations on air-fuel mixing and flame characteristics of biodiesel fuels for diesel engine application

机译：柴油机用生物柴油燃料的空燃混合和火焰特性研究

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In this study, the spray and combustion phenomena of biodiesels were investigated in a constant volume combustion chamber (CVCC). Mineral diesel was used as a baseline fuel and biodiesels derived from waste cooking oil, Karanja oil, and Jatropha oil were utilized to investigate the effect of fuel properties on spray and combustion processes. Experiments were performed at high temperature and pressure conditions in order to simulate the atmospheric environment of a diesel engines. Test fuels were injected at an injection pressure of 80 MPa using a common-rail equipped solenoid injector. Macroscopic evaporation characteristics were analyzed by high-speed shadowgraphy technique under evaporating conditions. The representative droplet size distribution and Sauter mean diameter (SMD) were measured using the Phase Doppler Interferometry (PDI) technique, which was applied to study the spray atomization characteristics of the fuels. The air-fuel equivalence,ratio in the spray was calculated using mathematical correlations. The quantitative estimations of soot generation in the spray flames were compared using Hue number analysis. From the shadowgraphy images, the biodiesels showed slower air-fuel mixing characteristics than the baseline diesel due to their inferior volatility. While diesel evaporated abruptly after the fuel injection, the biodiesels showed dense liquid regions in the center of the spray plume. Biodiesels also exhibited larger SMD than the baseline mineral diesel in the fuel spray because of their higher density, viscosity, and surface tension. Despite having poor spray atomization characteristics, the calculated equivalence ratio of biodiesels was lower than that of the baseline diesel. This trend was attributed to the oxygen content of biodiesel. The flame luminosity and visible spray flame duration of biodiesels were lower than those of diesel, while the biodiesel spray flames exhibited lower sooting tendency than the baseline diesel.
机译：在这项研究中，研究了在恒定容积燃烧室（CVCC）中生物柴油的喷雾和燃烧现象。矿物柴油被用作基准燃料，而衍生自废食用油，Karanja油和麻风树油的生物柴油被用于研究燃料特性对喷雾和燃烧过程的影响。为了模拟柴油发动机的大气环境，在高温和高压条件下进行了实验。使用配备共轨的电磁喷油器以80 MPa的喷射压力喷射测试燃料。在蒸发条件下，通过高速阴影技术分析了宏观的蒸发特性。使用相多普勒干涉法（PDI）技术测量了代表性的液滴尺寸分布和Sauter平均直径（SMD），该技术用于研究燃料的喷雾雾化特性。使用数学相关性计算喷雾中的空燃比。使用Hue数分析比较了喷雾火焰中烟尘生成的定量估计。根据阴影图像，由于生物柴油的挥发性较低，因此它们显示出比基准柴油更慢的空燃混合特性。尽管柴油在燃料喷射后突然蒸发，但生物柴油在喷雾羽流的中心显示出稠密的液体区域。由于其较高的密度，粘度和表面张力，生物柴油在燃油喷雾中还显示出比基准矿物柴油更大的SMD。尽管喷雾雾化特性差，但生物柴油的当量比仍低于基准柴油的当量比。这种趋势归因于生物柴油中的氧气含量。生物柴油的火焰光度和可见喷雾火焰持续时间低于柴油，而生物柴油喷雾火焰的烟灰趋势低于基准柴油。

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