Solid propellant-based space propulsion device
Disclosed is a space propulsion device capable of continuous operation using a solid propellant having high density and excellent handleability. The solid propellant-based space propulsion device comprises solid-propellant support means for supporting a solid propellant, a solid-propellant attachment surface for permitting the solid propellant to be attached thereon, solid-propellant feed means for feeding the solid propellant to an attachment position on the solid-propellant attachment surface, adhesion-energy supply means for heatingly melting or sublimating the solid propellant in the attachment position to adherently attach the solid propellant onto the solid-propellant attachment surface, solid-propellant transfer means for transferring the solid propellant to a release position for releasing the solid propellant, and propulsive-energy supply means for energizing the transferred solid propellant to release the solid propellant from the solid-propellant attachment surface at the release position, as a propulsive jet, while accelerating the solid propellant in a direction approximately perpendicular to the solid-propellant attachment surface. The solid-propellant transfer means is designed to move the solid-propellant attachment surface in such a manner that a area of the solid-propellant attachment surface for adherently holding the solid propellant is returned to a position adjacent to an end of the solid propellant in a repetitive manner.
1. A solid propellant-based space propulsion device comprising:
solid-propellant support means for supporting a solid propellant;
a solid-propellant attachment surface for permitting said solid propellant supported by said solid-propellant support means to be attached thereon on a portion-by-portion basis from the side of an end of said solid propellant;
solid-propellant feed means for moving the solid propellant supported by said solid-propellant support means toward said solid-propellant attachment surface to feed said solid propellant to an attachment position for attaching the solid-propellant onto said solid-propellant attachment surface;
adhesion-energy supply means for heatingly melting or sublimating a portion of the solid propellant fed to be in contact with or adjacent to said attachment position on said solid-propellant attachment surface, so as to adherently attach the portion of said solid propellant onto said solid-propellant attachment surface;
solid-propellant transfer means for moving said solid-propellant attachment surface having a area for adherently holding the solid propellant thereon, to transfer said solid propellant adherently held on said area to a release position for releasing said solid propellant; and
propulsive-energy supply means for energizing the solid propellant transferred to said release position to release said solid propellant from said solid-propellant attachment surface, toward a downstream side thereof as a propulsive jet, while accelerating the solid propellant in a direction approximately perpendicular to said solid-propellant attachment surface at said release position,
wherein said solid-propellant transfer means is designed to move said solid-propellant attachment surface in such a manner that said area for adherently holding the solid propellant is returned to a position adjacent to the end of said solid propellant in a repetitive manner.
2. The solid propellant-based space propulsion device as defined in claim 1 , which further comprises a tube-shaped jet member having an upstream end for introducing the propulsive jet generated at said release position and a downstream end for expelling the introduced propulsive jet, said upstream end of said jet member being disposed adjacent to said solid-propellant attachment surface, wherein said release position is defined within a area of said solid-propellant attachment surface surrounded by said upstream end of said jet member.
3. The solid propellant-based space propulsion device as defined in claim 2 , wherein said jet member is formed as a divergent nozzle.
4. The solid propellant-based space propulsion device as defined in claim 1 , wherein:
said solid propellant is formed in a rod shape; and
said solid-propellant feed means is operable to linearly move said solid propellant toward said solid-propellant attachment surface so as to feed said solid propellant forward.
5. The solid propellant-based space propulsion device as defined in claim 4 , wherein said solid-propellant feed means comprises a spring adapted to bias said solid propellant toward said solid-propellant attachment surface so as to feed said solid propellant forward.
6. The solid propellant-based space propulsion device as defined in claim 1 , wherein:
at least a part of said solid-propellant attachment surface is formed as a transparent portion made of a transparent material; and
said adhesion-energy supply means is composed of a laser beam oscillator, said laser beam oscillator being designed to generate a laser beam and irradiate the solid propellant located in said attachment position, with the laser beam from behind said solid-propellant attachment surface through said transparent portion to heatingly melt or sublimate said solid propellant so as to adherently attach said solid propellant onto said solid-propellant attachment surface.
7. The solid propellant-based space propulsion device as defined in claim 1 , wherein:
said solid propellant is made of a material which is sublimatable by heating;
at least a part of said solid-propellant attachment surface is formed as a transparent portion made of a transparent material; and
said propulsive-energy supply means is composed of a laser beam oscillator, said laser beam oscillator being designed to generate a laser beam and irradiate the solid propellant transferred to said release position, with the laser beam from behind said solid-propellant attachment surface through said transparent portion to heatingly sublimate and release said solid propellant.