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Sensitivity Analysis of Fuel Injection Characteristics of GDI Injector to Injector Nozzle Diameter

机译：GDI喷射器燃料喷射特性对喷射器喷嘴直径的敏感性分析

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摘要

The accuracy of a nozzle diameter directly affects the difference of the injection characteristics between the holes and productions of a GDI (gasoline direct injection) injector. In order to reduce the difference and guarantee uniform injection characteristics, this paper carried out a CFD simulation of the effect of nozzle diameter which fluctuated in a small range on single-cycle fuel mass. The sensitivity of the fuel injection quantity to the injector nozzle diameter was obtained. The results showed that the liquid phase ratio at the nozzle outlet decreased and the velocity of the outlet increased with the increase of the nozzle diameter. When fluctuating in a small range of nozzle diameters, the sensitivity of the single-hole fuel mass to the nozzle diameter remained constant. The increase of the injection pressure lead to the increase of the sensitivity coefficient of the single-hole fuel mass to the nozzle diameter. The development of cavitation in the nozzle and the deviation of the fuel jet from the axis were aggravated with the increase of the injection pressure. However, the fluctuation in a small range of nozzles had little effect on the near-nozzle flow.
机译：喷嘴直径的准确性直接影响GDI（汽油直喷）注射器的孔和制作之间的注射特性的差异。为了减少差异和保证均匀的注射特性，本文进行了在单循环燃料质量的小范围内波动的效果的CFD模拟。获得燃料喷射量对喷射器喷嘴直径的敏感性。结果表明，喷嘴出口处的液相比降低，并且出口的速度随喷嘴直径的增加而增加。当在小范围的喷嘴直径中波动时，单孔燃料质量与喷嘴直径的灵敏度保持恒定。注射压力的增加导致单孔燃料质量的灵敏度系数的增加与喷嘴直径的增加。随着喷射压力的增加，加剧了喷嘴中的空化和燃料射流的偏差的发展。然而，小范围喷嘴的波动对近喷嘴流影响不大。

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