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首页> 外文会议>ASME Internal Combustion Engine Division technical conference >INFLUENCE OF INJECTION PARAMETERS AND OPERATING CONDITIONS ON IGNITION AND COMBUSTION IN DUAL-FUEL ENGINES
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INFLUENCE OF INJECTION PARAMETERS AND OPERATING CONDITIONS ON IGNITION AND COMBUSTION IN DUAL-FUEL ENGINES

机译：喷射参数和工作条件对双燃料发动机点火和燃烧的影响

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Dual-Fuel (DF) engines offer great fuelflexibility since they can either run on gaseous or liquid fuels. In the case of Diesel pilot ignited DF-engines the main source of energy is provided by gaseous fuel, whereas the Diesel fuel acts only as an ignition source. Therefore, a proper autoignition of the pilot fuel is of utmost importance for combustion in DF-engines. However, autoignition of the pilot fuel suffers from lower compression temperatures of Miller or Atkinson valve timings. These valve timings are applied to increase efficiency and lower nitrogen oxide engine emissions. In order to improve the ignition, it is necessary to understand which parameters influence the ignition in DF-engines. For this purpose, experiments were conducted and the influence of parameters such as injection pressure, pilot fuel quantity, compression temperature and air-fuel equivalence ratio of the homogenous natural gas-air mixture were investigated. The experiments were performed on a periodically chargeable combustion cell using optical high-speed recordings and thermodynamic measurement techniques for pressure and temperature. The study reveals that the quality of the Diesel pilot ignition in terms of short ignition delay and a high number of ignited sprays significantly depends on the injection parameters and operating conditions. In most cases, the pilot fuel suffers from too high dilution due to its small quantity and long ignition delays. This results in a small number of ignited sprays and consequently leads to longer combustion durations. Furthermore, the experiments confirm that the natural gas of the background mixture influences the autoignition of the Diesel pilot oil.
机译：双燃料（DF）发动机具有很高的燃油灵活性，因为它们可以使用气态或液态燃料运行。在柴油引燃DF发动机的情况下，主要能源是由气态燃料提供的，而柴油燃料仅充当点火源。因此，引燃燃料的正确自燃对于DF发动机的燃烧至关重要。然而，引燃燃料的自动点火遭受米勒或阿特金森气门正时的较低压缩温度的困扰。应用这些气门正时可提高效率并降低氮氧化物发动机的排放。为了改善点火，有必要了解哪些参数会影响DF发动机的点火。为此，进行了实验，研究了均质天然气-空气混合物的喷射压力，引燃燃料量，压缩温度和空燃当量比等参数的影响。实验是使用光学高速记录和压力和温度的热力学测量技术在可定期充电的燃烧室上进行的。研究表明，柴油引燃器的点火延迟时间短和大量喷射的喷雾点火的质量在很大程度上取决于喷射参数和工作条件。在大多数情况下，引燃燃料由于其数量少和点火延迟长，因此稀释度过高。这导致少量的点火喷雾，并因此导致更长的燃烧持续时间。此外，实验证实，本底混合物的天然气会影响柴油引燃油的自燃。

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