Flight dynamic modelling for coaxial rigid rotor helicopter using vortex-ring wake model

YUAN Ye; CHEN Renliang; LI Pan

doi:10.7527/S1000-6893.2017.21564

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2018 , Vol. 39 >Issue 3: 121564 - 121564

DOI: https://doi.org/10.7527/S1000-6893.2017.21564

Fluid Mechanics and Flight Mechanics

Flight dynamic modelling for coaxial rigid rotor helicopter using vortex-ring wake model

YUAN Ye ,
CHEN Renliang ,
LI Pan

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National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received date: 2017-06-29

Revised date: 2017-10-10

Online published: 2017-10-10

Supported by

Aeronautical Science Foundation of China (20145752034); National Natural Science Foundation of China (51405227); A Project Funded by the Priority Academic Development of Jiangsu Higher Education Institutions

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Abstract

The rotor spacing of the coaxial rigid rotor helicopter is relatively small, and the complex aerodynamic interference between rotors could affect flight dynamic characteristics of the helicopter. To overcome this problem, this paper utilizes the vortex ring dynamic wake method to build the aerodynamic model for the coaxial rotor. The accuracy of the model is assessed by a comparison with a set of wind tunnel experimental data. A model for the flight dynamics of the coaxial rigid rotor helicopter is built based on the aerodynamic model mentioned above. The trim characteristics of the XH-59A helicopter with the forward speed 0-0.4 are calculated with the model. The results obtained with the model are consistent perfectly with flight test data, and the model is quick enough for flight dynamic calculation. Analysis of trim characteristics and the motion of the rotor wake shows that the aerodynamic interference between rotors increases the trim collective and collective differential in hover and low-speed forward flight, and the aerodynamic interference between rigid rotors causes a negative gradient of longitudinal trim along with forward speed.

Key words： helicopter; coaxial rigid rotor; aerodynamic interference; flight dynamics; dynamic wake; trim characteristics

Cite this article

YUAN Ye , CHEN Renliang , LI Pan . Flight dynamic modelling for coaxial rigid rotor helicopter using vortex-ring wake model[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018 , 39(3) : 121564 -121564 . DOI: 10.7527/S1000-6893.2017.21564

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