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

Xinhai Li, Yong Cheng, Shaobo Ji, Xue Yang and Lu Wang
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Xinhai Li: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Yong Cheng: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Shaobo Ji: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Xue Yang: School of Energy and Power Engineering, Shandong University, Jinan 250061, China
Lu Wang: School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Energies, 2019, vol. 12, issue 3, 1-16

Abstract: 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.

Keywords: gasoline direct injection injector; nozzle diameter; cavitation; near-nozzle flow; sensitivity coefficient (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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