Quantitative and qualitative analysis of the mass transfer and dispersion of methane injection under continuous mode shooting

This study investigated the performance of a natural gas injector with regard to its mass transfer and fuel dispersion. A newly developed gas injector was fabricated with an injector nozzle size that was optimized based on computational fluid dynamics. High-speed injection images were analyzed with the injection parameters related to injection penetration length, injection cone angle, injection time, and injection area. Both λ (the ratio of mass per injection area) and J_P(a rate of change of pixel number to change of penetration length) were employed to estimate the quantity and quality of the dispersion. As a result, a uniform distribution and well-dispersed gas properties could be explained with low λ and high J_P values. The λ and J_P results could be a very useful index used to quantitatively and qualitatively evaluate the performance of natural gas injection.