Ground‐breaking laser propulsion (LP) experiments were performed under quiescent conditions with a 25 cm wide, two‐dimensional Lightcraft model using a Lumonics TEA‐622 laser emitting ∼ 1 μs pulses. In preparation for subsequent hypersonic experiments, this static test campaign was conducted at ambient pressures of 0.06, 0.15, 0.30 and 1 bar with laser pulse energies of 150 to 230 J. Time‐variant pressure distributions, generated over engine “absorption chamber” walls, were integrated to obtain total impulse and momentum coupling coefficients representative of a single propulsion cycle. Schlieren visualization of laser‐induced air breakdown and expanding blast waves was also accomplished. Surprisingly, the results of 600‐3000 Ns/MJ were 2.5x to 5x greater than previous results from smaller Lightcraft models; this suggests that higher static performance can likely be achieved in larger scale LP engines. This research collaboration, forged between the USAF and Brazilian Air Force, was carried out at the Henry T. Nagamatsu Laboratory of Aerothermodynamics and Hypersonics in Brazil.
2‐D Airbreathing Lightcraft Engine Experiments in Quiescent Conditions
BEAMED ENERGY PROPULSION: Seventh International Symposium ; 2011 ; Ludwigsburg, (Germany)
AIP Conference Proceedings ; 1402 , 1 ; 158-173
10.11.2011
16 pages
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
2-D airbreathing lightcraft engine experiments in quiescent conditions
British Library Conference Proceedings | 2011
|2‐D Air‐Breathing Lightcraft Engine Experiments in Hypersonic Conditions
American Institute of Physics | 2011
|2-D Air-breathing lightcraft engine experiments in hypersonic conditions
British Library Conference Proceedings | 2011
|NTIS | 1991
|