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首页> 外文会议>EAEC European automotive congress >NUMERICAL INVESTIGATION OF AN INNOVATIVE LOWPRESSURE DIRECT-INJECTION SYSTEM FOR HYDROGEN ENGINES
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NUMERICAL INVESTIGATION OF AN INNOVATIVE LOWPRESSURE DIRECT-INJECTION SYSTEM FOR HYDROGEN ENGINES

机译：氢发动机创新低压直喷系统的数值研究

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The paper shows CFD activity concerning an innovative hydrogen direct-injection system, characterized by low fuel rail pressure. The system allows combining the benefits of hydrogen direct injection, mainly consisting in high specific power and in backfire prevention, with the typical ones of indirect injection, mainly consisting in the almost complete utilization of the on-board stored hydrogen, as well as in low cost and reliability. The injection is split in two steps: first an electroinjector meters hydrogen and feeds a small intermediate chamber, then the hydrogen stored in the chamber is injected into the cylinder with proper timing by a mechanically-actuated valve. A prototype was derived from a production single-cylinder motorcycle engine on the basis of previous CFD predictions and, despite important limitations in design freedom, proved to run correctly, without the typical drawbacks of hydrogen engines. Maximum power was higher than with gasoline. Present CFD activity is aimed at designing a new engine originally intended for hydrogen. Axisymmetric analyses have been carried out for several valve and seat-valve profiles, proving that proper geometrical details allow quite satisfactory fuel distribution at the ignition time for every engine speed and load.
机译：关于一个创新的氢直接喷射系统的纸张显示CFD活性，其特征在于，低燃料轨压力。该系统允许组合氢直接注射的好处，主要由在高比功率和在回火预防，与间接喷射的典型的，主要由在车载储存的氢几乎完全利用，以及在低成本和可靠性。注射是在两个步骤分成：第一一electroinjector米氢和馈送小中间室，然后被存储在腔室中的氢被一机械致动的阀注射到适当的定时在气缸。原型是从先前的CFD预测的基础上生产的单缸发动机的摩托车衍生，尽管在设计自由度重要的局限性，证明正确运行，没有氢发动机的典型的缺点。最大功率比汽油更高。目前CFD活动旨在设计一个新的引擎原本是为氢。轴对称分析已经进行了几个阀瓣和阀座，阀曲线，证明了正确的几何细节让每一个发动机转速和负荷的点火时间中规中矩燃料分布。

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