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。
Abstract
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 agree well with the experimental results. Totally, two rectangular sections in tandem, two Π-shaped sections in tandem and two streamlined sections in tandem 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 is close to that of the single section, the drag coefficients of leeward section increase with the increasing of D/B. The RMS of lift and pitching moment coefficients of windward are significantly less than that of the leeward section, and they first increase and then decrease with the increasing of D/B.
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
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Key words
two sections in tandem arrangement /
aerostatic coefficients /
aerodynamic interference effects /
numerical simulations /
wind tunnel experiments
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