The paper deals with the application of advanced simulation tools to modeling of properties of working cycle of hydrogen fueled engines. Two models of different level have been used. 0-D/1-D code GT-Power has been used to perform sensitivity analysis of influence of air excess, spark timing and compression ratio on main engine parameters and NO formation analysis. CFD model developed by the authors has been employed to detailed simulation of in-cylinder phenomena during combustion including chemical kinetics. Results giving practical clues concerning possible engine setting to avoid NO formation are presented. Comparisons with experiments are shown. The conclusions are summarized as follows: It is possible to use broad flammability limits of hydrogen and sufficiently fast combustion under extremely lean mixture conditions to NOx production reduction. The retarded spark advanced in combination with very lean mixture and high compression ratio is very efficient measure to achieve high engine efficiency and low NOx formation. The retarded spark advance is of advantage from the point of view of knocking avoidance. The hydrogen combustion chemistry solution shows the reaction zone should be very thin. It is caused because of the very fast chemistry. Influence of mixture molecular transport properties and turbulence parameters on hydrogen flame has to be proved. It seems to be necessary to use experiments being able to resolve flame distribution to the feature verification. In the presented simulations, suitability of the used reaction mechanism has to be examined. The CFD model predicts that NOx are formed in post-flame region only.
Emission potentials of hydrogen engine
2003
11 Seiten, 17 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
Emissionsminderung , Empfindlichkeitsanalyse , Luftüberschuss , Modellsimulation , Motor , numerische Strömungssimulation , Simulationsprogramm , Stickstoffoxid , Theorie-Experiment-Vergleich , Verbrennung (Oxidation) , Verbrennungsverhalten , Verdichtungsverhältnis , Wasserstoff , Wirkungsgrad , Zündeinstellung
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