Increase of passenger car engine efficiency with low engine-out emissions using hydrogen-natural gas mixtures: A thermodynamic analysis

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Increase of passenger car engine efficiency with low engine-out emissions using hydrogen-natural gas mixtures: A thermodynamic analysis

Dimopoulos, P. / Rechsteiner, C. / Soltic, P. / Laemmle, C. / Boulouchos, K.

In this study a state of the art passenger car natural gas engine was optimised for hydrogen natural gas mixtures and high exhaust gas recirculation (EGR) rates in the part load domain. With optimal combinations of spark timing (ST) and EGR rate the achievements are significant efficiency increase with substantially lower engine-out NO(x) while total unburned hydrocarbons or CO-engine-out emissions are not affected. Comprehensive investigations of the parameter space using design of experiments (DoE) algorithms provided a complete picture of the potential of such applications. Combustion analysis on the other hand allowed to identify improvements on the basis of accelerated combustion caused by the hydrogen as well as the reduced gas exchange losses due to EGR and associated less required throttling for a given engine output. The best combinations of EGR rate, hydrogen-fraction in the fuel and ST exhibited optimal in-cylinder pressure characteristics accompanied by moderate combustion peak temperatures and low expansion cylinder temperatures.

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Document information

Title :

Increase of passenger car engine efficiency with low engine-out emissions using hydrogen-natural gas mixtures: A thermodynamic analysis

Additional title:

Erhöhung des Wirkungsgrades von Personenkraftwagenmotoren mit niedrigen Emissionswerten mit Hilfe eines Wasserstoff-Erdgas-Gemischs: Ein thermodynamische Analyse

Contributors:

Dimopoulos, P. (author) / Rechsteiner, C. (author) / Soltic, P. (author) / Laemmle, C. (author) / Boulouchos, K. (author)

Published in:

ICMHE, International Conference on Materials for Hydrogen Energy: Solar Hydrogen, 2004 ; 3073-3083

International Journal of Hydrogen Energy ; 32 , 14

Publication date :

2007

Size :

11 Seiten, 9 Bilder, 3 Tabellen, 26 Quellen

ISSN :

0360-3199

DOI :