摘要
为研究均匀水流场中串列排布的柱群之间的干涉影响,本文以三维串列双圆柱为例,通过计算流体力学(CFD)软件FLUENT15.0中双方程k-ε模型,分析模拟了双圆柱所受平均阻力、平均升力、后柱周向压力、斯特劳哈尔数等水动力特性。结果表明:在雷诺数为Re=2×10~4的串列双圆柱绕流中,两圆柱中心间距L与圆柱直径D的比值为L/D=4时,后柱受前柱绕流尾流影响大,明显高于单圆柱绕流的平均阻力系数,后柱的周向压力值也随前柱尾流的摆动呈现显著的不对称性;当L/D=8时,前柱绕流尾流对后柱影响逐渐减弱;当L/D=12时,两圆柱之间的相互干扰几乎可以忽略,可以看作是相互独立的单圆柱绕流。最后,计算的斯特劳哈尔数与单圆柱绕流对应的斯特劳哈尔数相近且仿真数值在计算数值范围之内,验证了整个仿真分析的准确性,也进一步说明了双圆柱绕流的柱群的干涉影响。双圆柱间距越大,前、后柱之间的干涉影响越弱。
In order to study the interference effects between the columns arranged in a uniform flow field, a three-dimensional tandem double column is taken as an example in this paper. The hydrodynamic characteristics such as lift coefficient, drag coefficient, and Strouhal number are simulated by CFD software FLUENT15.0 in a two-equation k-ε model. The results show that when Reynolds number Re=2×10~4, the ratio of the center distance L and the diameter D of the cylinder is L/D=4, the average resistance coefficient of the rear column is significantly higher than that of the single cylinder, and the circumferential pressure value of the rear column also exhibits significant asymmetry with the swing of the front column wake, when L/D=8, the influence of front stream around the wake on the rear pillar gradually weakened, and while the L/D=12, the mutual interference between the two cylinders is almost negligible and can be seen as a separate single-cylinder flow. Finally, the calculated Strouhal number is similar to the Strouhal number corresponding to the single-cylinder flow and the simulation value is within the calculated range, which verifies the accuracy of the simulation analysis, but also further explains the effect of the interference of the columns on the two-cylinder flow. The larger the spacing of the two cylinders is, the weaker he interference between the front and rear columns is.
出处
《应用力学学报》
CAS
CSCD
北大核心
2018年第5期1164-1169,共6页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51405255)
山东省高等学校科技计划项目(J12LN95)
山东省科技发展计划-政策引导类项目(2012YD04038)
关键词
雷诺数
柱群
尾流
水动力特性
圆柱绕流
Reynolds number
column group
wake flow
hydrodynamic characteristics
flow around cylinder
