# US 8,769,923 B2 · Liquid-fuel storage vessel and vapor jet system using the same

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- Number: US 8,769,923 B2
- Document ID: US8769923B2
- Status: Granted
- Kind: B2
- Application number: 12/401,496
- Filed: 2009-03-10
- Published: 2009-09-10
- Granted: 2014-07-08
- Earliest claimed: 2008-03-10
- Assignees: Japan Aerospace Exploration Agency
- Applicants: Takayuki Yamamoto; Osamu Mori; Junichiro Kawaguchi
- Inventors: Takayuki Yamamoto; Osamu Mori; Junichiro Kawaguchi
- Web page: https://patentgrep.com/patent/US8769923B2

## CPC

- F02K 9/42: using liquid or gaseous propellants (F02K9/72 takes precedence)
- B64G 1/401: {Liquid propellant rocket engines (Ion or plasma engines B64G1/413; Arcjets and other resistojets B64G1/415)}
- B64G 1/4021: {Tank construction; Details thereof}
- F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00)
- B64G: COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR

## Abstract

Disclosed is a liquid-fuel storage vessel for use in a vapor jet system to store liquid fuel, wherein the vapor jet system is adapted to jet the fuel in a state after being vaporized inside the liquid-fuel storage vessel, outside the liquid-fuel storage vessel, to obtain a thrust. The liquid-fuel storage vessel comprises: a hollow tank for storing the liquid fuel, wherein the tank has an ejection port for ejecting the vaporized fuel, outside the liquid-fuel storage vessel therethrough; a heating device for heating the tank; and a porous metal formed to have a plurality of interconnected cells and provided inside the tank, wherein at least a part of the liquid fuel is held in the cells of the porous metal, and heat energy given from the heating device to the tank is transferred to the liquid fuel through the porous metal to cause vaporization of at least a part of the liquid fuel. The liquid-fuel storage vessel of the present invention can obtain a stable thrust level and ensure spacecraft attitude control.

## Claims

### Claim 1

A liquid-fuel storage vessel for use in a vapor jet system to store liquid fuel, the vapor jet system being adapted to jet the fuel outside the liquid-fuel storage vessel to obtain a thrust, in a state after being vaporized inside the liquid-fuel storage vessel, the liquid-fuel storage vessel comprising:
a hollow tank for storing the liquid fuel, the tank having an ejection port for ejecting the vaporized fuel, outside the liquid-fuel storage vessel therethrough;
a heating device for heating the tank; and
a porous metal formed to have a plurality of interconnected cells and provided inside the tank, wherein at least a part of the liquid fuel is held in the cells of the porous metal, and heat energy given from the heating device to the tank is transferred to the liquid fuel through the porous metal to cause vaporization of at least a part of the liquid fuel, wherein the porous metal has a laminated structure of a plurality of porous metal layers, wherein the porous metal fills the tank, wherein the porous metal is joined to an inner wall of the tank with a heat conducting adhesive, and wherein the heating device is wound around the entire circumference of an outer wall of the tank.

### Claim 2

A vapor jet system comprising:
a liquid-fuel storage vessel for use in the vapor jet system to store liquid fuel, the vapor jet system being adapted to jet the fuel outside the liquid-fuel storage vessel to obtain a thrust, in a state after being vaporized inside the liquid-fuel storage vessel, the liquid-fuel storage vessel comprises:
a hollow tank for storing the liquid fuel, the tank having an ejection port for ejecting the vaporized fuel, outside the liquid-fuel storage vessel therethrough;
a heating device for heating the tank; and
a porous metal formed to have a plurality of interconnected cells and provided inside the tank, wherein at least a part of the liquid fuel is held in the cells of the porous metal, and heat energy given from the heating device to the tank is transferred to the liquid fuel through the porous metal to cause vaporization of at least a part of the liquid fuel, wherein the porous metal has a laminated structure of a plurality of porous metal layers, wherein the porous metal fills the tank, wherein the porous metal is joined to an inner wall of the tank with a heat conducting adhesive, and wherein the heating device is wound around the entire circumference of an outer wall of the tank;
wherein the vapor jet system being adapted to jet fuel in a state after being vaporized inside the liquid-fuel storage vessel, outside the liquid-fuel storage vessel, to obtain a thrust.