串列双幅典型断面三分力系数气动干扰效应

发布时间：2019-05-09 02:36

【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。
[Abstract]:By means of wind tunnel test and numerical simulation, the aerodynamic interference effects of three-component force coefficient and Sturoha number on a series of double typical cross sections (rectangular section, Pi section and streamlined section) are studied. First, the numerical simulation and wind tunnel test of the three-component force coefficient for a rectangular cross-section with a width-to-height ratio of 5 are carried out, and the numerical simulation results are in good agreement with the wind tunnel test results. Then the three-component force coefficient and Stirach number corresponding to different spacing ratio D B (D is the net spacing between two sections and B is the width of a single section) of two typical cross sections in series are numerically simulated. The results show that the resistance coefficient of the upstream section is close to that of the single section, while the downstream section resistance coefficient increases with the increase of the spacing ratio. The aerodynamic interference factor of fluctuating root variance of upstream cross-sectional lift coefficient and lift moment coefficient is obviously smaller than that of downstream cross-section lift coefficient fluctuating root variance, and both of them increase first and then decrease with the spacing ratio of D / B.
【作者单位】：湖南大学土木工程学院;
【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)
【分类号】：U441.3

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