摘要
跨声速抖振直接影响飞机结构强度和疲劳寿命,易引发飞行事故。对于刚性静止翼型,其跨声速抖振特性仅与来流状态参数(马赫数、迎角和雷诺数)有关。该文通过释放翼型的俯仰自由度,采用非定常雷诺平均N-S方程建立了流场和结构的耦合求解方法,研究翼型结构弹性特征对跨声速抖振始发边界的影响。研究发现,结构固有频率对弹性支撑翼型的抖振边界影响较大,系统会在更小的来流迎角下失稳;而质量比对抖振边界影响较小。弹性支撑翼型的抖振始发迎角较刚性静止翼型的抖振起始迎角降低了近1°,因此翼型的弹性特征是跨声速抖振研究的重要因素。
Transonic buffet has a negative impact on the structural strength and fatigue life of aircraft, which may lead to flight accidents. For stationary airfoils, transonic buffet characteristics are associated with the freestream conditions, namely, the Mach number, angle of attack and Reynolds number. In this paper, a coupled method is established based on Unsteady Reynolds Averaged Navier-Stokes（URANS）, and the effect of the elastic characteristics on buffet onset boundary is studied by releasing the pitching degree of freedom to serve as a variable quantity. It is discovered that the structure natural frequency has a great influence on the buffet onset boundary of the spring suspended airfoil, the system becoming unstable at a smaller angle of attack, while the mass ratio has a weak impact. The buffet onset boundary of the spring suspended airfoil is 1 degree less than that of the rigid stationary airfoil, making the elastic characteristics of the airfoil an important factor in transonic buffet studies.
出处
《工程力学》
EI
CSCD
北大核心
2017年第1期243-247,共5页
Engineering Mechanics
基金
国家自然科学基金项目(11272262
11572252)
国家自然基金优秀青年基金项目(11622220)
教育部新世纪人才支持计划项目(NCET-13-0478)
关键词
跨声速流动
抖振
抖振边界
弹性特征
结构固有频率
transonic flow
buffet
buffet onset
elastic characteristic
structure natural frequency
