Title: Impact of hydrogen flow rate on H₂+diesel combustion in RCCI engine

Authors: Mukul Joseph; Saleel Ismail; T.J.S. Jothi

Addresses: Department of Mechanical Engineering, National Institute of Technology Calicut, Calicut – 673601, Kerala, India ' Department of Mechanical Engineering, National Institute of Technology Calicut, Calicut – 673601, Kerala, India ' Department of Mechanical Engineering, National Institute of Technology Calicut, Calicut – 673601, Kerala, India

Abstract: This study examines the effect of hydrogen flow rate (HFR) and load on different phases of hydrogen+diesel+air co-combustion, emissions and performance in a hydrogen+diesel reactivity controlled compression ignition (RCCI) engine. An empirical correlation was developed using experimental data to predict the brake thermal efficiency (BTE) of H₂+diesel RCCI engines. Three distinct combustion phases were observed during RCCI combustion at high HFR and high loads. At all loads, an increase in the HFR caused a decrease in carbon-based emissions, such as CO₂, CO, smoke, and HC. For medium and low loads, NO_x emissions decreased as the HFR increased; however, at 100% load, NO_x emissions increased.

Keywords: hydrogen+diesel; reactivity controlled compression ignition; RCCI; performance; phases of combustion; emissions.

DOI: 10.1504/IJGW.2024.142601

International Journal of Global Warming, 2024 Vol.34 No.3, pp.243 - 259

Received: 09 Jan 2024
Accepted: 05 Aug 2024
Published online: 11 Nov 2024 *

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