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http://dx.doi.org/10.5139/JKSAS.2011.39.6.487

Trim Range and Characteristics of Autorotation(I): Rotor Speed Limit and Pitch Range  

Kim, Hak-Yoon (한서대학교 항공학부)
Choi, Seong-Wook (항공우주연구원 스마트 무인기 그룹)
Publication Information
Journal of the Korean Society for Aeronautical & Space Sciences / v.39, no.6, 2011 , pp. 487-497 More about this Journal
Abstract
Numerical analysis has been performed to investigate the rotor speed and pitch range variations when the airspeed is increased in autorotation. Transient Simulation Method(TSM) was used to obtain the steady states of autorotation. The rotor blade was analyzed by the two-dimensional compressible Navier-Stokes solver in order to adapt to the airspeed increase and the results were used in the transient simulation method. Meanwhile, the Pitt/Peters inflow theory was used to supply the induced velocity fields. For the prescribed torque equilibrium state, the combinations of velocity, shaft angle, and pitch angle were produced to investigate the rotor speeds and variable ranges. The rotor tip Mach number and rotor speed were correlated and the trim range of pitch angle was observed with respect to the shaft angle decrease.
Keywords
Transient Simulation Method; Autorotation; Trim Range of Autorotation;
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