Effects of injection strategies coupled with gasoline-hydrogenated catalytic biodiesel blends on combustion and emission characteristics in GCI engine under low loads. (1st June 2022)

• Record Type: Journal Article
• Authors: Liu, Qing; Pachiannan, Tamilselvan; Zhong, Wenjun; Nallusamy, N.; Zhang, Yanzhi; Li, Zilong; Qian, Yong; Wang, Qian; He, Zhixia; Lu, Xingcai
• Is Part Of: Fuel. Volume 317(2022)
• Publication Date: 2022-06-01
• Subjects: Low temperature combustion -- Gasoline compression ignition -- Injection strategy -- Low load -- Combustion -- Emissions; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2022.123490
• Languages: English
• ISSNs: 0016-2361

Abstract

Highlights: A new type of gasoline-HCB fuel blend is proposed for GCI engine. Combustion characteristics (HRR, PRRmax ) are more influenced by fuel blends. NOx, CO, THC, and PM are more influenced by pilot quantity than injection timing. Lower HCB blends with lower pilot ratio during early SOI produces better results. Abstract: The Gasoline Compression Ignition (GCI) engine is one among the most advanced combustion mode engines, having high thermal efficiency with lower nitrogen oxides and particle emissions simultaneously targeted for upcoming emission regulations. The engine's practical applications are limited by its igniting difficulty and combustion stability at low loads. In order to address these issues, a novel type of high reactive fuel known as hydrogenated catalytic biodiesel is mixed with gasoline as fuel in various ratios (20–40%) and its combustion and emission parameters are studied at low loads. Experiments were carried out in single and double injection mode to find out optimum engine conditions by varying start of injection timings (−7 to −13 deg. CA aTDC). Further, in double injection mode with different pilot fuel injection ratios from 20 to 40% and pilot fuel injection timings from −60 to −40 deg. CA aTDC. The experimental results show that stable combustion is achieved at low loads by using this test fuel without having any ignition difficulty or combustion assistance. The findings of the single-injection mode show that delaying the injection timing resulted in lower maximum pressure rise rate, nitrogen oxide emissions and nucleation mode number concentration emissions under low load conditions. The double injection mode controls the maximum pressure rise rate and cyclic variations within the controlled range under all conditions. From different test conditions, a lower pilot injection ratio (20%) during the advanced start of injection (−60 deg. CA aTDC) condition is recommended because it shows better combustion and emission results. Overall, the gasoline-hydrogenated catalytic biodiesel blend could be the fuel for GCI engines and it is effective at tackling low load difficulties.