Three Stream Model is applied to the flow in the scramjet combustor. Separate temperatures are assigned to the hydrogen, the air and the ignition source material. A mixing routine is included in the model which allows the unmixed fuel and air to be mixed at a prescribed schedule along the combustor. The area profile along the flow direction is used as a design parameter and is optimized by the multiplier method. A wall friction factor and a heat transfer coefficient can be calculated by the van Driest turbulence model. Therefore, the effect of heat recovery from engine wall by fuel hydrogen is made clear. The fuel injection momentum is also taken into consideration.

Liquid-phase dehydrogenation of cyclohexanes with suspended noble metal catalysts yielded aromatic hydrocarbons and molecular hydrogen exclusively under boiling and refluxing conditions. Retardation effects of aromatic addends, fit well to a Langmuir-type rate equation, were especially large for those which exhibited facile simultaneous hydrogen transfer. The catalysts suitable to the benzene-hydrogenation electrode and to the endothermic dehydrogenation reactor are essentially important in the newly-proposed thermo-regenerative fuel cell system.

To keep a good storage efficiency of a liquid hydrogen, a reciprocating liquid hydrogen pump has to have a long and slender structure to eliminate the heat transferred from the outside of the tank into the liquid hydrogen in the tank. Because of the structure, it is quite difficult to align the both center axes of the piston and cylinder. Therefore, the pump is subject to having a large clearance between the piston and the cylinder resulting in a large amount of leakage of liquid hydrogen. To solve the problem, a self -alignment structure has been applied to the pump and a good performace has been obtained.