A flat‐roofed parabolic nozzle is adopted to study the multi‐pulse laser propulsion performance. The multi‐pulse impulse coupling coefficient decreases when the laser repetition rate increases in the range of 10 to 400 Hz. The details of the evolution process of the inner and outer flow fields are simulated. The results indicate that the air exhaust and refill processes influence multi‐pulse propulsion performance directly. By comparing the initial and multi‐pulse flow fields, the air in the nozzle is found to be partially recovered. An uneven low‐density distribution and the mass loss result in a decrease in when the pulse number increases. Moreover, breathing in air to the nozzle for multi‐pulse when the focal position is near the exit is beneficial.
Numerical Analysis of Laser Repetition Rate and Pulse Numbers in Multi‐pulsed Laser Propulsion
BEAMED ENERGY PROPULSION: Seventh International Symposium ; 2011 ; Ludwigsburg, (Germany)
AIP Conference Proceedings ; 1402 , 1 ; 296-305
10.11.2011
10 pages
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Numerical analysis of laser repetition rate and pulse numbers in multi-pulsed laser propulsion
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