Injection rate and flow characteristics of gasoline-methanol blended fuels from GDI injector according to methanol blending ratio

초록

The e-methanol, synthesized from green hydrogen and captured CO2, emerges as a promising near-term solution for the carbon neutralization of internal combustion engines. To examine the feasibility of e-methanol as a dropin fuel for conventional vehicles, it is crucial to understand the effects of methanol blending on fuel injection and energy delivery rates, yet studies on this subject remain scarce. This study investigates the injection rate characteristics of gasoline-methanol blends, focusing on the effect of methanol blending ratio. The Bosch long-tube method is applied to measure the transient injection rate, while the momentum flux method is used to measure the actual injection velocity. This approach enables the estimation of flow velocity and area coefficients, evaluating the overall flow performance of the injector. The results showed that increasing the methanol blending ratio decreased the flow velocity coefficient (max. 3.7 %) but increased the area coefficient (max. 7.1 %), resulting in an increase in the discharge coefficient (max. 3.3 %). The total injection mass per shot increased by 8.2 % at maximum, but the total fuel energy per injection decreased with the increase in methanol blending ratio. These findings provide essential insights for optimizing engine performance when using e-methanol as a drop-in fuel.

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