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Re: [AWES] Power Maximization of a Closed-orbit Kite Generator System

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  • dave santos
    This nice analysis and simulation helps validate closed-orbit AWES flight. Sadly, it did not go so far as to simulate open-orbit in the same framework, for
    Message 1 of 2 , Dec 15, 2012
      This nice analysis and simulation helps validate "closed-orbit" AWES flight. Sadly, it did not go so far as to simulate "open-orbit" in the same framework, for a directly comparative result.

      We had been calling closed-orbit modes "short-stroke" pumping (brief recovery during swept loops or figure-of-eights), but closed-orbit is better more-precise usage. Similarly, open-orbit is better technical description than "long-reeling" or "yo-yo". 

      Closed orbits conserve airspace, reduce gaps in the generation cycle, and avoid excessive line wear (just a short chafe-resistant section is needed at the fairlead). Open orbits characterized the primitive proof-of-concept phase for many teams, but are expected to fade away in future design cycles by dominant teams.

      Another nice prediction of this work is a that a nice wide eight seems power-optimal compared to a tight or tilted eight). "Lazy" eights is the pattern that comes natural to traction kite pilots and is the tamest aerobatic pattern. A tilted eight helps tug a load crosswind or upwind and the tight eight (Dutch Roll mode) is useful for controlled power-limiting.





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