In this study, the effect of hydrogen assisted intake air on combustion characteristics of a diesel fuel-waste cooking oil biodiesel (WCOB) blend fueled CI engine has been extensively studied. While the diesel and B25 (75% diesel fuel+25% WCOB) fuels used as the main fuel were sprayed directly into the cylinder, the hydrogen, the secondary fuel was mixed with the intake air at 10, 20, 30 and 40 lpm flow rates and taken into the cylinder. The maximum in-cylinder pressure (CP) values decreased with B25 fuel compared to diesel fuel. But B25‑hydrogen dual-fuel mode operation exhibited higher maxium CP and RoPR value according to diesel fuel. It was seen that hydrogen has a more significant effect on premixed pilot fuel combustion phase compared to the diffusion combustion phase. It was observed that the combustion duration (CD) of neat B25 fuel lower than that of diesel fuel, generally. In case of B25‑hydrogen dual-fuel mode operation, CD increased depending on increasing hydrogen addition rate. It was seen that hydrogen enrichment has no adverse effect on ringing intensity (RI).

在这项研究中，氢气辅助进气对柴油 - 废食用油生物柴油 (WCOB) 混合燃料 CI 发动机燃烧特性的影响已得到广泛研究。用作主要燃料的柴油和 B25（75% 柴油 + 25% WCOB）燃料直接喷入气缸，而氢气、辅助燃料则以 10、20、30 和 40 lpm 流量与进气混合率并进入气缸。与柴油燃料相比，B25 燃料的最大缸内压力 (CP) 值降低。但根据柴油燃料，B25-氢双燃料模式运行表现出更高的最大 CP 和 RoPR 值。可以看出，与扩散燃烧阶段相比，氢气对预混引燃燃料燃烧阶段的影响更为显着。据观察，纯 B25 燃料的燃烧持续时间 (CD) 通常低于柴油燃料的燃烧持续时间。在 B25-氢双燃料模式运行的情况下，CD 随加氢速率的增加而增加。可以看出，富氢对振铃强度（RI）没有不利影响。