亚临界雷诺数下凹坑圆柱绕流数值模拟分析及减阻性能研究

发布时间：2018-05-26 04:14

  本文选题：圆柱绕流 + 凹坑　； 参考：《机械强度》2017年05期

【摘要】：为研究非光滑圆柱绕流减阻性能,采用SST k-ω湍流模型对亚临界雷诺数R_e=40 000下凹坑圆柱绕流进行数值模拟及减阻性能研究。对凹坑深度、内部形状、分布形式进行了结构参数敏感性分析,研究各参数对凹坑圆柱绕流减阻性能的影响规律。结果表明:凹坑圆柱具有较好的绕流减阻效果;阻力系数、升力系数均随凹坑深度增加呈先减小后增大的变化趋势,且在h=0.015D时,凹坑圆柱绕流具有最佳减阻效果;圆柱形凹坑圆柱平均阻力系数为0.923,球面形凹坑圆柱平均阻力系数为0.94;菱形分布凹坑织构的圆柱绕流阻力系数平均值为0.923,矩形情况为0.973。
[Abstract]:In order to study the drag reduction performance of a non-smooth cylinder, the SST k- 蠅 turbulence model is used to simulate the flow around a pit cylinder with subcritical Reynolds number R_e=40 000 and its drag reduction performance is studied. The sensitivity of the structure parameters to the depth, shape and distribution of the pit is analyzed, and the influence of the parameters on the drag reduction performance around the pit cylinder is studied. The results show that the resistance coefficient and lift coefficient decrease first and then increase with the increase of pit depth, and the flow around the pit cylinder has the best drag reduction effect at hu 0.015 D. The results show that the resistance coefficient and lift coefficient decrease firstly and then increase with the increase of pit depth. The average drag coefficients of cylindrical and spherical concave cylinders are 0.923 and 0.94, respectively, and the mean value of flow resistance coefficient of rhombic distribution concave texture is 0.923 and the rectangular case is 0.973.The results show that the average drag coefficient of cylindrical cylinder is 0.923, that of spherical concave cylinder is 0.94, and that of rhombic distribution is 0.923.
【作者单位】： 西南石油大学机电工程学院;
【基金】：国家自然科学基金项目(51274171) “十二五”国家科技重大专项(2011ZX05026-001-07)资助~~
【分类号】：O357.5
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本文编号：1935902