The autoignition and combustion of hydrogen were investigated in a constant-volume combustion vessel under simulated direct-injection (DI) diesel engine conditions. The parameters varied in the investigation included: the injection pressure and temperature, the orifice diameter, and the ambient gas pressure, temperature and composition. The results show, that the ignition delay of hydrogen under DI diesel conditions has a strong, Arrhenius dependence on temperature; however, the dependence on the other parameters examined is small. For gas densities typical of top-dead-center (TDC) in diesel engines, ignition delays of less than 1.0 ms were obtained for gas temperatures greater than 1120 K with oxygen concentrations as low as 5 % (by volume). These data confirm that compression ignition of hydrogen is possible in a diesel engine at reasonable TDC conditions. In addition, the results show that DI hydrogen combustion rates are insensitive to reduced oxygen centrations. The insensivity of ignition delay and combustion rate to reduced oxygen concentrations is significant becouse it offers the potential for dramatic reduction in the emission of nitric oxides from a compression-ignitid DI hydrogen engine through use of exhaust-gas-recirculation.
Hydrogen combustion under diesel engine conditions
Verbrennung von Wasserstoff im Dieselmotor
1996
10 Seiten, 12 Bilder, 18 Quellen
Aufsatz (Konferenz)
Englisch
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