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ABSTRACT
To assess the feasibility of hydrogen as a substitute for diesel, the impact of hydrogen addition into intake air on diesel engines was examined numerically using GT Power software at various operating conditions. The original engine is a four-cylinder turbocharged diesel engine, which is modified into a hydrogen diesel dual-fuel (HDDF) engine with an injection of hydrogen into the intake port and a direct injection of diesel into the cylinder. Engine speeds are set at 1600, 2300, and 3600 rpm, while the engine loads are set at 25%, 50%, and 75%, respectively. H2 energy ratio (HER) varies from 0% to 60% at an interval of 10%. The results demonstrate that as the HER increases, the peak cylinder pressure (PCP) decreases, while the peak cylinder temperature (PCT) increases, the indicated mean effective pressure (IMEP) and indicated thermal efficiency (ITE) increases, while the ignition delay period shortens. Among them, the PCP is reduced by 4–7%, and the ITE is increased by 2–3.5%. In terms of emissions, CO and HC emissions are significantly decreased under all operating conditions, but for NOx emissions, NOx emissions remain unchanged (within a range of 7%) under most operating conditions, except for the increase in NOx emissions under high-speed and high-load conditions.
Nomenclature
| BTE | = | Brake Thermal Efficiency |
| CA | = | Crank angle |
| CO | = | carbon monoxide |
| CO2 | = | Carbon dioxide |
| H2 | = | Hydrogen |
| HC | = | Hydrocarbons |
| HDDF | = | Hydrogen-diesel dual-fuel |
| HER | = | H2 energy ratio |
| HRR | = | Heat release rate |
| IMEP | = | Indicated Mean Effective Pressure |
| ITE | = | Indicating Thermal Efficiency |
| LPM | = | Liter Per Minute |
| MPRR | = | Maximum pressure rise rate |
| NO | = | Nitric oxide |
| NOx | = | Nitrogen oxides |
| PM | = | Particulate Matter |
| PCP | = | Peak cylinder pressure |
| PCT | = | Peak cylinder temperature |
| RPM | = | Revolution per minute |
| TDC | = | Top Dead Center |
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Yuanli Xu
Dr. Yuanli Xu is an associate professor at Tianjin University of Science & Technology.
Shanxu Cheng
Mr. Shanxu Cheng is a master student at Tianjin University of Science & Technology.
Zhangjun Tu
Mr. Zhangjun Tu is a master student at Tianjin University of Science & Technology.
Junquan Li
Mr. Junquan Li is a master student at Tianjin University of Science & Technology.