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Calculation of downwash of helicopter

  1. Aug 24, 2007 #1
    Hi everyone,
    I am doing the research on helicopter aerodynamics. By applying the blade element theory and momentum theory we can determine the induced velocity at the balde, and we knew that, at a distance very far below the rotor, the induced velocity is two time of the corresponding value at rotor disc. how can we determine the induced velocity at a certain distance below the rotor disc. For example, I have a rotor disc, whose diamter is 150mm, and I would like to calculate the induced velocity at the distance 60mm below the rotor disc, but I do not know how to solve this problem. Could you share with me your knownledge in this section. Thanks!
     
  2. jcsd
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