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首页> 外文期刊>Journal of Engineering for Gas Turbines and Power >Experimental Investigation of Fuel Anti-Knock-Index Requirements in Three Small Two-Stroke Engines for Remotely Piloted Aircraft
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Experimental Investigation of Fuel Anti-Knock-Index Requirements in Three Small Two-Stroke Engines for Remotely Piloted Aircraft

机译：三架小型二冲程遥控飞机燃油抗爆指标要求的实验研究

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摘要

Small remotely piloted aircraft (10-25 kg) that are powered by internal combustion engines typically operate on gasoline with an anti-knock index (AKI) 80. To comply with the single-battlefield-fuel initiative [Department of Defense (DOD) Directive 4140.25], interest has increased in converting power plants for these platforms to run on low-AKI fuels such as diesel and Jet-A with AKIs of similar to 20. It has been speculated that the higher losses (short circuiting, incomplete combustion, heat transfer) that cause these engines to have lower efficiencies than their conventional-scale counterparts may also relax their required fuel AKI. The fuel-AKI requirements of three two-stroke spark ignition (SI) engines with 28, 55, and 85 cm(3) displacements were mapped, and the performance was compared to that on 98 ON (octane number) fuel. Switching from 98 ON fuel to 20 ON (Jet-A and diesel equivalent AKI) fuel while maintaining optimum combustion phasing led to a 3-5 crank-angle degree (CAD) reduction in burn angle, a 2-3% increase in power, and a 0.5-1% (absolute) increase in fuel-conversion efficiency at non-knock-limited conditions through shortening of the CA0-CA10 burn angle. The efficiency improvement translates to a 6% increase in range or endurance. The results indicate that abnormal combustion is not a significant obstacle to operating small commercial-off-the-shelf (COTS) engines on low-AKI fuels and that most of the power and efficiency improvements demonstrated in previous heavy-fuel conversion efforts were the result of modifications made to accommodate low-volatility fuels, not the faster burn rate of the low-AKI fuels themselves.
机译：由内燃发动机提供动力的小型遥控飞机（10-25千克）通常使用抗爆指数（AKI）> 80的汽油运行。为了遵守单战场燃料倡议[国防部（DOD）指令4140.25]，对于将这些平台的发电厂转换为使用AKI类似于20的低AKI燃料（如柴油和Jet-A）运行的兴趣日益增加。据推测，更高的损耗（短路，不完全燃烧，热传递）导致这些发动机的效率低于传统发动机的效率，也可能会放松其所需的燃料AKI。绘制了排量为28、55和85 cm（3）的三个二冲程火花点火（SI）发动机的燃料AKI要求，并将其性能与98 ON（辛烷值）燃料进行了比较。在保持最佳燃烧相位的同时，从98 ON燃料转换为20 ON（Jet-A和柴油当量的AKI）燃料，导致燃烧角降低3-5个曲轴角（CAD），功率提高2-3％，通过缩短CA0-CA10燃烧角，在非爆震限制条件下的燃料转换效率提高了0.5-1％（绝对）。效率的提高意味着续航力或续航力提高了6％。结果表明，异常燃烧不是使用低AKI燃料运行小型商用现货（COTS）发动机的重大障碍，并且以前重油转换工作中展示的大部分功率和效率改进都是其结果。为适应低挥发性燃料所做的修改，而不是低AKI燃料本身的更快燃烧速度。

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