Browse > Article
http://dx.doi.org/10.5139/JKSAS.2011.39.6.498

Trim Range and Characteristics of Autorotation(II): Advance Ratio Variation and Flapping Characteristics  

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. 498-504 More about this Journal
Abstract
The flapping characteristics and advance ratios at torque equilibrium state of autorotation were investigated when the airspeed, shaft angle, and pitch angle were varied. To simulate the airspeed increase, the aerodynamic data analyzed by using the compressible Navier-Stokes solver and Pitt/Peters inflow theory were used. Transient Simulation Method(TSM) was used to catch the torque equilibrium states. The maximum flapping angles at torque equilibrium state were correlated to the airspeed, shaft angle, and pitch angle. By comparing flapping behavior to the variation of advance ratio, the phenomenon that the extension of reverse flow area of retreating blade affects the characteristics of autorotation was qualitatively considered.
Keywords
Autorotation; Transient Simulation Method; Flapping characteristics; Inflow theory; Torque equilibrium state;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Hohenemser, K. H., “Aerodynamic Aspects of the Unloaded Rotor Convertible Helicopter”, Journal of the American Helicopter Society, Vol. 2, (1), pp. 147-174, Jan. 1957.
2 Hickey, D. H., “Full-Scale Wind-Tunnel Tests of the Longitudinal Stability and Control Characteristics of the XV-1 Convertiplane in the Autorotating Flight Range”, NACA RM A55K21a, 1956.
3 Floros, M. W., and Johnson, W., “Performance Analysis of the Slowed-Rotor Compound Helicopter Configuration”, American Helicopter Society 4th Decennial Specialists’ Conference on Aeromechanics Proceedings, San Francisco, CA, Jan. 2004.
4 Floros, M. W., and Johnson, W., “Stability and Control Analysis of the Slowed-Rotor Compound Helicopter Configuration”, Journal of the American Helicopter Society, Vol. 52, No. 3, pp. 239-253, 2007.   DOI
5 Schank, T., "Optimal /Weroelastic Trim for Rotorcraft with Constrained, Non-Unique Trim Solutions" Ph.D. Thesis, School of Aerospace Engineering, Georgia Tech, Atlanta, U.S., Apr. 2008.
6 Rigsby, J. M., "Stability and Control Issues Associated with Lightly Loaded Rotors Autorotating at High Advance Ratios", Ph.D. Thesis, School of Aerospace Engineering, Georgia Tech, Atlanta, U.S., Oct. 2008.
7 Kim, H. Y., Sheen, D. J., and Park, S. O., “Numerical Simulation of Autorotation in Forward Flight”, Journal of aircraft, Vol. 46, No. 5, 2009, pp. 1642-1648.   DOI   ScienceOn
8 Pahlke, K. and Chelli, E., “Calculation of Multibladed Rotors in Forward Flight Using a 3D Navier-Stokes Method”, 26th European Rotorcraft Forum, The Hague (nl), 26-29/09. 2000.
9 Pomin, H. and Wagner, S., “Navier-Stokes Analysis of Helicopter Rotor Aerodynamics in Hover and Forward Flight”, Journal of Aircraft, Vol. 39, No. 5, Sep-Oct. 2002.
10 Wheatley, J. B. and Bioletti, C., “Wind-Tunnel Tests of a 10-Foot-Diameter Gyroplane Rotor”, NACA TR No. 536. 1935.
11 김학윤, “Super STOL 수송기 개념에 의한 고관성 Pre&Autorotating 로터의 공력 특성에 관한 연구”, 한국항공대학교 대학원 석사학위 논문, 2000년.
12 http://www.cartercopters.com