### 基于涡环尾迹模型的共轴刚性旋翼直升机飞行动力学建模

1. 南京航空航天大学 直升机旋翼动力学国家级重点实验室, 南京 210016
• 收稿日期:2017-06-29 修回日期:2017-10-10 出版日期:2018-03-15 发布日期:2017-10-10
• 通讯作者: 陈仁良,E-mail:crlae@nuaa.edu.cn E-mail:crlae@nuaa.edu.cn
• 基金资助:
航空科学基金（20145752034）；国家自然科学基金（51405227）；江苏高校优势学科建设工程资助项目

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

YUAN Ye, CHEN Renliang, LI Pan

1. National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
• Received:2017-06-29 Revised:2017-10-10 Online:2018-03-15 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

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.