Effect of Injection Strategy on Hydrogen Direct-Injection Spark-Ignition Engine 2021-24-0050
The use of hydrogen as a possible fuel for internal combustion (IC) engines can help build a society with a clean transportation framework. Diluting the in-cylinder mixture can improve the efficiency of the engines. To prove the validity of lean burn in hydrogen IC engines, three different combustion modes are investigated in this study. The engine experiments are conducted in a spray-guided direct-injection (DI) spark-ignition engine with 10 MPa of hydrogen DI. When lean burn is applied to a hydrogen IC engine, the characteristics of pumping and heat transfer loss improve. The improvement in heat transfer loss is more significant than the reduction in negative pumping work for the indicated thermal efficiency. Among the three combustion modes, stratified charge combustion (SCC) develops the maximum indicated mean effective pressure. However, this mode deteriorates the combustion stability slightly. The nitrogen oxide emission is reduced when the excess air ratio is increased. However, a certain amount of NOx is emitted because of the locally rich mixture in SCC. Investigating the lean burn characteristics can contribute to building a clean transportation society by realizing clean and efficient hydrogen IC engines.
Citation: Lee, S., Kim, G., and Bae, C., "Effect of Injection Strategy on Hydrogen Direct-Injection Spark-Ignition Engine," SAE Technical Paper 2021-24-0050, 2021, https://doi.org/10.4271/2021-24-0050. Download Citation
Author(s):
Sanguk Lee, Gyeonggon Kim, Choongsik Bae
Affiliated:
Korea Advanced Inst of Science & Tech
Pages: 7
Event:
15th International Conference on Engines & Vehicles
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Lean burn engines
Spark ignition engines
Nitrogen oxides
Combustion and combustion processes
Heat transfer
Engines
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