本文選題：圓柱繞流 + 凹坑�。� 參考：《機(jī)械強(qiáng)度》2017年05期

【摘要】：為研究非光滑圓柱繞流減阻性能,采用SST k-ω湍流模型對亞臨界雷諾數(shù)R_e=40 000下凹坑圓柱繞流進(jìn)行數(shù)值模擬及減阻性能研究。對凹坑深度、內(nèi)部形狀、分布形式進(jìn)行了結(jié)構(gòu)參數(shù)敏感性分析,研究各參數(shù)對凹坑圓柱繞流減阻性能的影響規(guī)律。結(jié)果表明:凹坑圓柱具有較好的繞流減阻效果;阻力系數(shù)、升力系數(shù)均隨凹坑深度增加呈先減小后增大的變化趨勢,且在h=0.015D時(shí),凹坑圓柱繞流具有最佳減阻效果;圓柱形凹坑圓柱平均阻力系數(shù)為0.923,球面形凹坑圓柱平均阻力系數(shù)為0.94;菱形分布凹坑織構(gòu)的圓柱繞流阻力系數(shù)平均值為0.923,矩形情況為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.
【作者單位】： 西南石油大學(xué)機(jī)電工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51274171) “十二五”國家科技重大專項(xiàng)(2011ZX05026-001-07)資助~~
【分類號(hào)】：O357.5
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本文編號(hào)：1935902