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Effects of LPG Fuel Formulations on Knock and Pre-Ignition Behavior of a DI SI Engine

机译:LPG燃料制剂对DI SI发动机爆震和预点火行为的影响

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Due to their CO_2 reduction potential and their high knock resistance gaseous fuels present a promising alternative for modern highly boosted spark ignition engines. Especially the direct injection of LPG reveals significant advantages. Previous studies have already shown the highest thermodynamic potential for the LPG direct injection concept and its advantages in comparison to external mixture formation systems. In the performed research study a comparison of different LPG fuels in direct injection mode shows that LPG fuels have better auto-ignition behavior than gasoline. A correlation between auto-ignition behavior and the calculated motor octane number could not be found. However, a significantly higher correlation of R2 = 0.88 - 0.99 for CR13 could be seen when using the methane number. One major challenge in order to implement the LPG direct injection concept is to ensure the liquid state of the fuel under all engine operating conditions. Especially at hot soak conditions, the critical point can be exceeded and the supercritical state can be reached. In this context SI combustion anomalies for LPG depending on the gas mixture components are largely unexplored. Therefore the study also focuses on investigations of the pre-ignition behavior of different LPG fuel formulations in liquid and supercritical state.
机译:由于它们的CO_2降低潜力和它们的高抗撞击性气体燃料为现代高压火花点火发动机带来了一个有前途的替代方案。特别是直接注射LPG揭示了显着的优势。以前的研究已经显示了LPG直接注射概念的最高热力学潜力及其优点与外部混合物形成系统相比。在进行的研究中,研究不同LPG燃料在直接喷射模式下的比较表明,LPG燃料具有比汽油更好的自燃行为。找不到自动点火行为与计算的电机辛烷值之间的相关性。然而,当使用甲烷数时,可以看到CR13的r2 = 0.88-0.99的显着提高。为了实现LPG直接注射概念的一个主要挑战是在所有发动机操作条件下确保燃料的液态。特别是在热浸泡条件下,可以超过临界点,并且可以达到超临界状态。在这种情况下,根据气体混合物组分的LPG的Si燃烧异常在很大程度上是未开发的。因此,研究还侧重于研究不同LPG燃料制剂在液体和超临界状态下的预点火行为的研究。

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