Abstract
An experimental investigation on the influence of different hydrogen fractions and EGR rates on the performance and emissions of a spark-ignition engine was conducted. The results show that EGR utilization decreases the engine power output. However, hydrogen addition can increase the power output at large EGR operation. Thermal efficiency shows an increasing trend at small EGR rate and a decreasing trend with further increase of EGR rate. In the case of small EGR rate, thermal efficiency is decreased with the increase of hydrogen fraction; while in the case of large EGR rate, thermal efficiency is increased with increasing of hydrogen fraction. For a specified hydrogen fraction, NOx concentration is decreased with the increase of EGR rate and this effectiveness becomes more obviously at high hydrogen fraction. HC emission is increased with the increase of EGR rate and it decreases with the increase of hydrogen fraction. CO and CO2 emissions show little variation with EGR rate, but they decrease with the increase of hydrogen fraction. The study shows that natural gas-hydrogen blend combined with EGR can realize low emissions for the spark-ignition engine.
| Original language | English |
|---|---|
| Pages (from-to) | 385-394 |
| Number of pages | 10 |
| Journal | Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) |
| Volume | 27 |
| Issue number | 5 |
| State | Published - Sep 2009 |
Keywords
- Exhaust gas recirculation
- Hydrogen
- Natural gas
- Performance
- Spark ignition engine