Hybrid-LO2-LH2 low cost launch vehicle

Details Hybrid-LO2-LH2 low cost launch vehicle Hybrid-LO2-LH2 low cost launch vehicle

1996-08-23

1998-06-16

Thorpe, Timothy

Power plants

Reaction motor

Method of operation

60251, 60219, 60256, 60257, F02K 928

Patent

active

057653615

ABSTRACT:
A low-cost rocket or thruster has a low-cost propellant injector, in which fluid fuel and oxidizer are injected into a combustion chamber. The walls of the combustion chamber are protected from the high temperatures of the combustion by a grain of solid propellant, the surface of which tends to melt andor vaporize in the presence of combustion temperatures, and thereby protects the walls of the chamber. The low-cost propellant injector may not mix the fluid fuel and oxidizer effectively, so that pockets of noncombusted gas may occur within the chamber. The ratio of fluid fuel and oxidizer is selected to be slightly oxidizer-rich, so that any pockets of unburned gas tend to be oxygen-rich. When the pockets come into contact with the solid fuel, the excess oxygen combusts with the gaseous solid fuel, and when the mixture is near stoichiometric, the fluid fuel combusts. Thus, an inexpensive bipropellant injector together with a solid fuel grain simultaneously allows use of solid fuel instead of insulation to protect the combustion chamber walls, and the combustion is stabilized by the presence of the solid fuel. Ideally, the amount of excess oxidizer should be sufficient to completely combust the solid fuel. The preferred propellants are LO2 and LH2, and the preferred solid fuel is HTPB.

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