Experimental investigations on hydrogen biofueled reactivity controlled compression ignition engine using open ECU. (15th August 2021)

• Record Type: Journal Article
• Authors: Karthic, S.V.; Senthil Kumar, M.
• Is Part Of: Energy. Volume 229(2021)
• Publication Date: 2021-08-15
• Subjects: Biofuels -- Engine emission optimization -- Exhaust gas recirculation -- Oxides of nitrogen -- Smoke -- Hydrogen; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2021.120787
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: This research work comprehensively investigates the different strategies on in-cylinder and after-treatment to reduce emissions in diesel engines under RCCI operation using 'Fuel of Future' Hydrogen and madhuca longifolia (ML) oil as primary and pilot fuels. The study used CRDI integrated with an open ECU system. Online injection timing/pressure variation, split injection, nano-emulsion, hydrogen-based RCCI mode, and cooled EGR techniques were implemented to extend the emissions to EURO-VI or BS-VI emission norms. The online optimized injection timing and pressure of ML operation improved the smoke emissions by 33% and 24%; HC emissions by 10% and 7%; CO emissions by 23% and 11%. With these optimized conditions, the pilot injection was splited as SPLIT-1 and 2 with three different spilt ratios (20:80, 30:70, 40:60). Also, 100 ppm graphene oxide emulsified with ML (NEM100) improved the smoke, HC, and CO emissions by 50%, 31%, and 35% respectively with optimized injection parameters. Amazingly, it was further reduced by 69%, 51%, and 64% under the hydrogen RCCI mode of operation. According to calculations and measurements, this research work successfully extended the emissions such as NOx, HC, and CO to 0.9, 1, and 1 g/kWh which are closer or equal to EURO-VI norms. Highlights: Split injection (40:60) improved the BTE, HC, and smoke emissions by 13, 17, and 42%. Hydrogen co-combustion increased the BTE by 30% compared to conventional operation. NOx was decreased by 6 and 70% for 5 and 10% cooled EGR under optimized conditions. NOx, HC, CO were reduced to 0.9, 1, 1 g/kWh; closer to EURO6 norms 0.4, 0.16, 1.5 g/kWh.