个人信息Personal Information
教授
招生学科专业:
航空宇航科学与技术 -- 【招收博士、硕士研究生】 -- 航空学院
机械 -- 【招收博士、硕士研究生】 -- 航空学院
毕业院校:南京航空航天大学
学历:南京航空航天大学
学位:工学博士学位
所在单位:航空学院
联系方式:crlae@nuaa.edu.cn
电子邮箱:
Performance analysis of coaxial-rotorfor hovering in ground effect
点击次数:
所属单位:航空学院
发表刊物:Harbin Gongye Daxue Xuebao
摘要:There are complex rotor/rotor/ground interference effects when a coaxial-rotor helicopter hovers near ground. A computational method based on free-wake model is developed to analyze the flow field and thrust of coaxial-rotor helicopter in ground effect. Firstly, the lifting-surface blade model and the ground panel model are taken in this method to simulate the effects of blades and ground to the flow field. A 3rd-order accuracy time-marching scheme is conducted to get the free-wake of coaxial-rotor. Also, the constant-volume-rectification method is incorporated to prevent numerical divergence. Then, the coaxial-rotor out of ground effect (OGE) and the single-rotor in ground effect (IGE) are used as examples to validate the method. Finally, based on the examples, the features are analyzed, including the characteristics of wakes and flow field, the distribution of velocity and thrust in rotor disk plane, the interference effects between two rotors and the gain of thrust. Calculated results show that the wake rolls up and expands radially in ground effect when hovering, besides the induced velocity in rotor disk plane is connected with upper rotor, lower rotor and ground. The results show that ground effect causes the more uniform distribution of induced velocity and thrust along the rotor. Besides, the gain of thrust for coaxial-rotor is higher than that of a single rotor when the power is kept the same. © 2017, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.
ISSN号:0367-6234
是否译文:否
发表时间:2017-10-30
合写作者:Lu, Taoye,Ji, Honglei,Xin, Ji
通讯作者:陈仁良