Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Performance Analysis of Autorotation(2) : Performance of High Speed Autorotaion

자동회전의 성능해석(2) : 고속 자동회전의 성능

  • Received : 2011.10.10
  • Accepted : 2011.12.23
  • Published : 2012.01.01
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Abstract

Performance variation of autorotating rotor was investigated. The shaft angle of the rotor is reduced while the flight velocity is increased. The BO-105 helicopter rotor blade was replaced by untwisted NACA 0012 airfoil and the rotor was simulated by using Transient Simulation Method(TSM) to judge the autorotation region for the variables. To simulate the compressibility effect at high speed flight, two-dimensional aerodynamic data was analyzed by compressible Navier-Stokes solver and Pitt/Peters inflow theory was adopted to simulate the induced velocity field. Thrust and lift coefficients, lift to drag ratio variations were investigated, also the lift and power were compared to those of BO-105 helicopter. Sharing lift and power between the autorotating rotor and wing was considered when the compound aircraft concept is introduced.

샤프트각이 감소하며 비행 속도가 증가하는 자동회전 상태의 로터에 대한 성능 변화를 해석하였다. BO-105 헬리콥터의 로터에 비틀림이 없는 NACA 0012 단면을 가지는 깃을 해석하였고 변수에 대한 자동회전의 영역을 구하기 위해 과도모사법(TSM)이 사용되었다. 고속 비행에서 압축성 효과를 모사하기 위해 압축성 Navier-Stokes 솔버로 해석된 2차원 공력 데이터가 사용되었으며 유도 속도장을 모사하기 위해 Pitt/Peters의 유도속도 이론이 사용되었다. TSM으로 구해진 정상 자동회전 상태에 대하여 추력계수와 양력계수, 양항비를 계산하였으며 로터의 양력과 동력을 구하여 BO-105 헬리콥터와 비교하였다. 복합 항공기의 개념을 도입할 때 자동회전하는 로터와 날개의 양력 및 동력 분담률을 고찰하였다.

Keywords

References

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