变转速旋翼直升机性能及配平研究

doi:10.7527/S1000-6893.2013.0228

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2013, Vol. 34 ›› Issue (6): 1241-1248.doi: 10.7527/S1000-6893.2013.0228

• Fluid Mechanics and Flight Mechanics • Next Articles

Study on the Performance and Trim of Helicopters with Variable Speed Rotors

HAN Dong

College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2012-07-02 Revised:2012-09-26 Online:2013-06-25 Published:2012-10-29
Contact: 10.7527/S1000-6893.2013.0228 E-mail:donghan@nuaa.edu.cn
Supported by:
Aeronautical Science Foundation of China (2011ZA52004); Foundation of National Key Laboratory of Helicopter Aeromechanics (9140C400601120C4001); New Faculty Foundation of Nanjing University of Aeronautics and Astronautics(56YAH11012)

Abstract

Abstract:

To investigate the performance and trim characteristics of helicopters with variable speed rotors, this paper makes a study of the rotor power with variable rotor speed, forward speed, helicopter weight and fight altitude as well as the pitch controls and tilt of rotor shaft with respect to rotor speed and forward speed based on a comprehensive rotor modeling. The results indicate that significant power reduction is achieved by the reduction of rotor speed, which can be utilized to improve the endurance, range and flight altitude of helicopters. The variation of rotor speed has significant influence on the trim of helicopters. The trim limits the rotor working at very low rotor speeds,which may incur the increase of the rotor power. The collective and cyclic pitches increase with decreasing rotor speed. The variation of the longitudinal tilt of the rotor shaft with rotor speed is not obvious, and the lateral tilt decreases with decreasing rotor speed.

Key words: helicopter, rotor, variable speed, power, trim

CLC Number:

V212.5

HAN Dong. Study on the Performance and Trim of Helicopters with Variable Speed Rotors[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(6): 1241-1248.

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Study on the Performance and Trim of Helicopters with Variable Speed Rotors

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