摘要
采用风洞试验与数值模拟相结合的方法对串列双幅典型断面(矩形断面、Π型断面及流线型断面)三分力系数和斯脱罗哈数的气动干扰效应进行了研究。首先针对宽高比为5的单幅矩形断面分别进行了三分力系数的数值模拟和风洞试验测试,数值模拟结果与风洞试验结果吻合良好;然后对串列双幅典型断面不同间距比D/B(D为双幅断面之间净间距,B为单幅断面宽度)对应的三分力系数及斯脱罗哈数进行了数值模拟。研究显示:上游断面阻力系数与单幅断面比较接近,下游断面阻力系数则随间距比D/B的增加而增加;上游断面升力系数、升力矩系数脉动根方差气动干扰因子明显小于下游断面升力系数脉动根方差气动干扰因子,两者均随间距比D/B先增加后减小。
Aerodynamic interference effects on aerostatic coefficients and Strouhal numbers of two sections in tandem,namely,two rectangular sections in tandem,two Π-type sections in tandem and two streamlined sections in tandem,were investigated using numerical methods and wind tunnel tests. To validate the accuracy of the numerical methods,the numerical simulation of flow passing a fixed rectangular section with a width-to-depth ratio of 5 was carried out,and the numerical results agreed well with the experimental results. The aerostatic coefficients and Strouhal numbers of different types of two sections in tandom and with a varying separation ratio of D / B（ D is the net distance between two sections in tandem,B is the width of the single section） were simulated separately with numerical methods. The results show that the drag coefficients of windward section are close to those of single section,and the drag coefficients of leeward section increase with the increase in D / B; the RMSs of lift and pitching moment coefficients of windward section are significantly less than those of leeward section,and they first increase and then decrease with the increase in D / B.
出处
《振动与冲击》
EI
CSCD
北大核心
2015年第5期6-13,共8页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(50608030
51178181)
湖南省高校创新平台开放基金项目(11K015)
湖南大学青年教师成长计划资助(2013)
关键词
串列双幅断面
三分力系数
气动干扰效应
数值模拟
风洞试验
two sections in tandem arrangement
aerostatic coefficient
aerodynamic interference effect
numerical simulation
wind tunnel experiment
