摘要
利用自行开发的二维非定常Eu ler方程的求解程序模拟S826叶型的外部非定常绕流,分别研究了在俯仰振动、平振以及俯仰与平振耦合的情况下叶型的气动特性。研究表明,随着折合频率,振幅值的增大,迟滞效应增强;平振与俯仰振动耦合时,当-90°≤≤90°时,气动力是激振力;当90°<<270°时,气动力为阻尼力。
The code based on two-dimensional unsteady Euler equation is used to simulate the configuration of the S826 airfoil which is oscillating. The unsteady performance of the airfoil is studied in the pitching, flapping and the coupling oscillation respectively. The results show that the aerodynamic hysteresis enhances with the increasing of the reduced frequency and oscillation amplitude. In the coupling oscillation, when the phase difference is bigger than 90 degrees and less than 270 degrees , the aerodynamic force becomes the damping force ;otherwise, the aerodynamic force is an exciting force.
出处
《流体机械》
CSCD
北大核心
2007年第8期14-18,共5页
Fluid Machinery
基金
上海市教委资助项目(05ZZ27)
上海高校优秀青年教师后备人选项目(04YQHB141)
关键词
欧拉方程
S826叶型
非定常气动力特性
数值模拟
euler equations
S826 airfoil
unsteady aerodynamic performance
numerical simulation
