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 CO 2 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 (C m ) representative of a single propulsion cycle. Schlieren visualization of laser‐induced air breakdown and expanding blast waves was also accomplished. Surprisingly, the C m results of 600‐3000 Ns/MJ were 2.5x to 5x greater than previous results from smaller Lightcraft models; this suggests that higher static C m 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.


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    Title :

    2‐D Airbreathing Lightcraft Engine Experiments in Quiescent Conditions



    Conference:

    BEAMED ENERGY PROPULSION: Seventh International Symposium ; 2011 ; Ludwigsburg, (Germany)


    Published in:

    AIP Conference Proceedings ; 1402 , 1 ; 158-173


    Publication date :

    2011-11-10


    Size :

    16 pages





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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