Optimization of diesel injection strategy for ammonia-diesel dual-fuel engines with high compression ratio

doi:10.3969/j.issn.1674-8484.2023.06.015

Abstract

Abstract:

The effects of diesel injection strategy on combustion and emission performance were investigated to improve the ammonia combustion efficiency and thermal efficiency of ammonia-diesel engines. The control method of ammonia intake-port injection and diesel split direct injection was used on a 6-cylinder ammonia-diesel engine with a compression ratio to 21. Diesel first injection was used to activate the thermal atmosphere while the second injection was used to control the combustion phase. The results show that advancing the first injection timing of diesel reduces the nitrogen oxide (NO_x) emissions of ammonia-diesel mode by 30%. Increasing the first injection mass improves the ammonia combustion efficiency and reduces the emissions of nitrous oxide (N₂O) and carbon monoxide (CO) by 85% and 50%, respectively. The effective thermal efficiency first increases and then decreases with the increase of the first injection mass. By optimizing the diesel injection strategy, the maximum effective thermal efficiency of ammonia-diesel mode can be 1.2% higher than that of diesel-only mode under the same compression ratio. Therefore, the diesel direct injection strategy optimized is expected to save energy and reduce the carbon emissions of heavy-duty vehicles.

Key words: heavy-duty vehicle engine, diesel direct injection strategy, ammonia-diesel dual-fuel, combustion efficiency, emission of pollutant

CLC Number:

TK428.9

CAI Kaiyuan, WANG Zhi, LIU Yi, CHEN Qingchu, QI Yunliang, LIN Hao, LU Wenjian, ZHANG Shenhuan, YIN Yong. Optimization of diesel injection strategy for ammonia-diesel dual-fuel engines with high compression ratio[J]. Journal of Automotive Safety and Energy, 2023, 14(6): 783-789.

Figures/Tables 8

References 18

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