摘要
在亚临界流动范围内,利用DES方法对俯仰细长旋成体的流动特性进行数值模拟,给出了细长旋成体在大攻角纵向俯仰中的截面流态特点。研究发现,迎角变化跨越对称至不对称流态的上仰运动会产生明显的气动力迟滞现象,推迟了非对称的产生迎角,并延缓了细长体背风面流态之间的过渡。对细长体大攻角运动气动分析在国内外研究尚少,研究成果对充分利用非定常气动力有指导意义。
Numerical investigations of flow behavior for pitching-up and pitching-down slender body are performed in subcritical Reynolds number region.Sectional slow pattern is observed and corresponding flow mechanism is analyzed.It is found that the obvious aerodynamic hysteresis will arise when the pitching oscillation of the model goes through the different flow condition（symmetric and asymmetric vortices）.Pitching motion delays the occurring angle of asymmetry and slows the transition of flowfield structure.Consequently the results are useful to the application of unsteady aerodynamic forces.
出处
《科学技术与工程》
2011年第16期3720-3724,共5页
Science Technology and Engineering
基金
国家自然科学基金(10772149)资助
关键词
非定常空气动力学
细长旋成体
非对称
气动滞后
unsteady aerodynamics slender body asymmetric vortices hysteresis characteristics
