The effectiveness of traditional knock mitigation strategies to increase load on a DI H2 engine
2022-01-0571
03/29/2022
- Event
- Content
- One way to reduce a vehicles tailpipe CO2 emissions is to use a fuel with a higher hydrogen to carbon ratio. The use of pure hydrogen result in near-zero tailpipe CO2 emissions. However the use of hydrogen in pre-mixed spark-ignition combustion systems results in abnormal combution event. The fast burn-rate of hydrogen can result in high-frequency pressure oscillations while the low motor octane number (MON) leads to pre-ignition as load increases. End-gas knock is also observed at relatively low loads with pure hydrogen. In this study, lean operation, EGR operation and water injection are used to mitigate some of the combustion challenges associated with pure H2 combustion. Data was collected on a 115 mm bore 1.3 liter single-cylinder research engine operating at 12:1 geometric compression ratio. Hydrogen was injected through a side-mounted direct injector at 100 bar rail pressure. The results are compared to port-fuel injected compressed natural gas.
- Citation
- Conway, G., "The effectiveness of traditional knock mitigation strategies to increase load on a DI H2 engine," SAE Technical Paper 2022-01-0571, 2022, .