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88 Victor Pantilie et al.
At the engine running on gasoline calculated around 2000 ppm NOx
emissions at stoichiometric excess air-fuel ratio. At the hydrogen fuelled engine
running to limit this NOx level must be used the excess air-fuel ratio values
greater than 1.8 (Fig. 6).
At this dosage the power output on hydrogen with supercharge pressure
of 1.5 bar is greater than the power output on gasoline with normal intake and at
excess air-fuel ratio greater than 2 the power is similar but the NOx emissions
level is significantly reduced (less than 50 ppm).
4. Conclusions
1. This paper confirms that hydrogen can be used in internal combustion
engines and by supercharging a spark ignition engine it can obtain similar
performance with lower emissions.
2. Using hydrogen without supercharging it is possible but with a major
impact on the power of the engine if hydrogen is admitted in the intake.
3. The NOx emissions level dropped below 50 ppm at λ=2 and if the
dosage is leaner it can achieve near zero NOx emissions.
4. The high engine efficiency when using hydrogen makes this fuel a
perfect fuel for urban cycles due to combustion improvement.
Acknowledgements. The work has been funded by the Sectoral Operational
Programme Human Resources Development 2007-2013 of the Romanian Ministry of
Labour, Family and Social Protection through the Financial Agreement
POSDRU/88/1.5/S/61178.
The authors would like to thank AVL GMBH Graz Austria for providing the
software AVL Boost v2011 used in this study.
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