An internal combustion steam turbine which was proposed by the authors (T. Kumakura et al., Int. J. Hydrogen Energy 17, 887 (1992)) is one of the new power sources for undersea vessels, of which the performance is less influenced by the sea depth. In the turbine, hydrogen with a stoichiometric ratio of oxygen is burnt both in liquid water and in steam, then the combustion product, H2O, does work along with the superheated steam. After the work is done, both the steam and the combustion product are condensed in a condenser and only a fraction of the combustion product is pumped out of the cycle. The work in pumping it out is less influenced by the depth, comparing to that in the gas phase. Thermodynamic cycle calculations on a simple cycle, a regenerative cycle and a regenerative-reheat cycle showed higher efficiencies than those of conventional steam turbines. The purpose of this work is to investigate the fundamental characteristics of the stoichiometric H2-O2 combustion in liquid water. Experiments both with a premixing and a diffusion burner were carried out in a water tank under the atmospheric pressure. The temperature of the water was changed from room temperature to saturated temperature. In the water at the room temperature, the premixing burner obtained a high combustion efficiency (99.86 %) at stoichiometry of the supplied gas, but showed occasional flashbacks. In contrast the diffusion burner maintained stable combustion, but the combustion efficiency was lowered. By using partially premixed gases, the efficiency was improved to the level of the premixing burner, while the flames were kept stable. The influence of the temperature of the water on the combustion characteristics is also presented.
Characteristics of stoichiometric H2-O2 combustion in water with premixing and diffusion burners
Die Charakteristik der stöchiometrischen Wasserstoff-Sauerstoff-Verbrennung mit Mischkammerbrennern und Diffusionsbrennern in Wasser
International Journal of Hydrogen Energy ; 21 , 8 ; 685-693
1996
9 Seiten, 11 Bilder, 4 Quellen
Aufsatz (Zeitschrift)
Englisch
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