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Ignition and combustion characteristics of gasoline-biodiesel blend in a constant volume chamber: Effects of the operation parameters

机译：恒定体积室内汽油-生物柴油混合物的点火和燃烧特性：操作参数的影响

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摘要

The GB20 combined from 20% biodiesel and 80% gasoline showed the excellent potential for engine fuel application due to utilizing superior lubrication ability, renewables, environmental friendliness, high ignitability from the biodiesel and high volatility from the gasoline. However, there has been no quantitative evaluation of ignition and combustion characteristics for the GB20 spray combustion by the optical investigation, yet. In this work, we performed a comprehensive study focused on the lift-off length and ignition delay of the GB20 in a constant volume chamber under a wide range of experimental conditions simulating engine operating conditions. The GB20 was injected into the combustion chamber under different conditions: gas density (5 kg/m(3) and 15 kg/m(3)), ambient temperature (800 K-1200 K), and oxygen content (10%-21%). The single-hole injector with a 0.2mm diameter was used to inject the fuel sample at various injection pressures (30 MPa-130 MPa) and injection durations (400 mu s-3500 mu s). The ignition delay and lift-off length were determined via broadband chemiluminescence imaging, which was obtained using a high-speed camera. A self-written LabVIEW code was made to separate and smoothen the flame from background noise in the image processing. As a result, the ignition delay and lift-off length heavily depend on the operating conditions. The increase of ambient temperature, ambient gas density, or oxygen concentration significantly decreases the ignition delay and lift-off length. The injection parameters, including the injection pressure and injection duration, also influence the airfuel mixing process, thus changing the local ambient temperature and local air-fuel ratio, resulting in increasing/decreasing the ignition delay and lift-off length. The ambient temperature is lower than 1000 K for the gas density of 5 kg/m(3) and 900 K for the gas density of 15 kg/m(3) at an oxygen concentration of 10%, the lift-off length result disappears due to the very few soot particles formation under the deficient oxygen condition.
机译：由20％的生物柴油和80％的汽油组合而成的GB20由于具有出色的润滑能力，可再生能源，环境友好性，生物柴油的高可燃性和汽油的高挥发性，因此在发动机燃料应用方面显示出了巨大的潜力。然而，还没有通过光学研究定量评估GB20喷雾燃烧的着火和燃烧特性。在这项工作中，我们进行了全面的研究，重点研究了在模拟发动机工况的各种实验条件下，恒定容积室内GB20的升起长度和点火延迟。将GB20在不同条件下注入燃烧室：气体密度（5 kg / m（3）和15 kg / m（3）），环境温度（800 K-1200 K）和氧气含量（10％-21 ％）。使用直径为0.2mm的单孔喷射器以各种喷射压力（30 MPa-130 MPa）和喷射持续时间（400μs-3500μs）喷射燃料样品。通过宽带化学发光成像确定点火延迟和升起长度，该成像是使用高速相机获得的。编写了一个自写的LabVIEW代码，以在图像处理中将火焰与背景噪声分离并平滑。结果，点火延迟和升程长度在很大程度上取决于运行条件。环境温度，环境气体密度或氧气浓度的增加显着降低了点火延迟和提离长度。包括喷射压力和喷射持续时间在内的喷射参数也影响空气燃料混合过程，从而改变局部环境温度和局部空燃比，从而导致点火延迟和升程长度的增加/减少。氧气浓度为10％时，气体密度为5 kg / m（3）时环境温度低于1000 K，气体密度为15 kg / m（3）时为900 K以下，剥离长度结果消失由于在氧气不足的情况下很少形成烟灰颗粒。

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