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| Research on Combustion Optimization and Thermal Efficiency Improvement of A Hydrogen In-Cylinder Direct Injection Engine |
| DOI：10.13949/j.cnki.nrjgc.2023.02.001 |
| Key Words:hydrogen direct injection engine combustion thermal efficiency injection phase |
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| Abstract:Based on a 1.5 L hydrogen in-cylinder direct injection engine， the combustion characteristics of hydrogen fuel was studied through experiments. The effects of deep supercharge and hydrogen injection timing on combustion and thermal efficiency were analyzed. Results show that as the excess air coefficient increases in lean-burn mode， the max pressure in-cylinder gets higher and the corresponding crankshaft angle is advanced. The peak heat release rate gradually decreases， and the start point of heat release is advanced and the duration of heat release becomes longer. The combustion temperature and pressure rise rate decreases. After the cylinder is deeply supercharged， the effective thermal efficiency can increase by 3%. When the injection angle is close to top dead center， the injection back pressure in cylinder increases， and the injection flow decreases. The pre- ignition tends to occur when the injection time is advanced. After the injection strategy is optimized， the effective thermal efficiency can reach 43.5%. |
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