In this report we present results of continuing analytical and experimental investigations carried out to evaluate the concept of pulsed laser propulsion. This advanced propulsion scheme, which has been the subject of several previous studies, involves supplying propellant energy by beaming short, repetitive laser pulses to a thruster from a remote laser power station. The concept offers the advantages of a remote power source, high specific impulse, high payload to total mass ratio (a consequence of the first two features) and moderate to high thrust (limited primarily by the average laser power available). The present research addresses questions related to thruster performance and optical design. In the thruster scheme under consideration, parabolic nozzle walls focus the incoming laser beam to yield breakdown in a propellant at the focal point of the parabola. The resulting high pressure plasma is characteristic of a detonation wave initiation by high power laser-induced breakdown. With a short laser pulse, the detonation wave quickly becomes a blast wave which propagates to the nozzle exit plane converting the high pressure of the gas behind it to a force on the nozzle wall. Propellant is fed to the focal region from a plenum chamber. The laser-induced blast wave stops the propellant flow through the throat until the pressure at the throat decays to the sonic pressure; then the propellant flow restarts. The process is repeated with each successive laser pulse.
Studies of a Repetitively-Pulsed Laser Powered Thruster
1982
94 pages
Report
No indication
English
Electric & Ion Propulsion , Propulsion systems , Thrusters , Pulsed lasers , Bremsstrahlung , Pulse generators , Specific impulse , Hybrid propulsion , Plasma generators , Carbon dioxide lasers , Tea lasers , Molecular lasers , Dimers , Fluorides , Xenon , Argon , Detonation waves , Far infrared radiation , Breakdown(Electronic threshold) , Ultraviolet lasers , High power , Light pulses , High pressure , Parabolas , Nozzles , Laser beams , Focusing , Blast waves , Infrared lasers , Plasmas(Physics) , Inverse bremsstrahlung , Laser propulsion , Remote energy stations , Xenon fluooride lasers , Parabolic mirrors , Ground based propulsion
Analytical Investigation of an Airbreathing, Repetitively Pulsed LSC‐Wave Thruster: Part 1
American Institute of Physics | 2006
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