Work

Improving performance and hydrogen knock limit in SI engines using acetone–gasoline blends

Year: 2025

Type: article

Abstract: Acetone was blended with gasoline at volume fractions of 20 %, 35 %, and 50 %. The supply strategy involves direct injection of the acetone–gasoline blend and port fuel induction of hydrogen. The hydrogen flow rate was increased incrementally by 2 LPM until the onset of knock. Combined acetone blending and hydrogen addition enhanced engine performance, as indicated by improvements in the brake mean effective pressure, brake thermal efficiency, and in-cylinder pressure. Moreover, advanced spark timing improved these parameters. The coefficient of variation of the peak in-cylinder pressure decreased with both acetone blending and hydrogen enrichment, indicating more stable combustion. While NO X emissions decreased with increasing acetone content, they increased significantly with hydrogen addition. Notably, acetone blending extended the hydrogen knock limit, increasing it from 8 to 10 LPM at 12° crank angle (CA) before top dead center (BTDC) and from 14 to 16 LPM at 4°CA BTDC.

Source: International Journal of Hydrogen Energy

DOI: 10.1016/j.ijhydene.2025.152864

Authors: S.T.P. Purayil, S.A.B. Al-Omari, E. Elnajjar

Institution: United Arab Emirates University

Language: English

Topic: Advanced Combustion Engine Technologies

Subfield: Fluid Flow and Transfer Processes

Field: Chemical Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,730