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| 高雷诺数时分离盘长度对圆柱绕流特性的影响 | |
| 引用本文： | 高云,王盟浩,宗智,邹丽,彭庚.高雷诺数时分离盘长度对圆柱绕流特性的影响[J].上海交通大学学报,2017,51(4):504. |
| 作者姓名： | 高云 王盟浩 宗智 邹丽 彭庚 |
| 作者单位： | 1. 西南石油大学 油气藏地质及开发工程国家重点实验室， 成都 610500； 2. 东京大学 机械工程学院， 东京113 8656； 3. 大连理工大学 船舶工程学院, 大连 116024 |
| 基金项目： | 国家自然科学基金(51609206, 51522902, 51379033)，国家留学基金(201608515007)资助项目 |
| 摘 要： | 使用大涡模拟方法,研究了高雷诺数时分离盘长度对圆柱绕流特性的影响,对不同长度分离盘下作用在圆柱体上的升力系数、拖曳力系数以及尾部流场的无量纲漩涡泄放频率(strouhal数)以及漩涡泄放形态进行了对比分析.分析结果表明:依据升力系数以及拖曳力系数随时间历程的变化特性可以将分离盘长度大致划分为3个区间,分别为稳定区间Ⅰ(分离盘长度L=0D时,D为圆柱直径)、非稳定区间Ⅱ(L=0.5D-1.0D)以及再稳定区间Ⅲ(L=1.5 D-8.0D).当分离盘长度从区间I变化到区间Ⅱ时,Strouhal(Sr)数出现突降;当分离盘长度从区间Ⅱ变化到区间Ⅲ时,Sr出现突升.随着分离盘长度的增加,圆柱尾部流场的漩涡泄放形式从2S模式(即从圆柱两侧每次只泄放单个漩涡)逐渐转化为2P模式(即从圆柱两侧每次同时泄放2个漩涡). |
| 关 键 词： | 圆柱体 分离盘 大涡模拟 高雷诺数 流场特性 |
Effect of Splitter Plate Length on Hydrodynamic#br# Performance Around Cylinder at High Reynolds Numbers |
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| GAO Yun,WANG Menghao,ZONG Zhi,ZOU Li,PENG Geng.Effect of Splitter Plate Length on Hydrodynamic#br# Performance Around Cylinder at High Reynolds Numbers[J].Journal of Shanghai Jiaotong University,2017,51(4):504. | |
| Authors: | GAO Yun WANG Menghao ZONG Zhi ZOU Li PENG Geng |
| Institution: | 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu 610500, China; 2. Department of Mechanical Engineering, The University of Tokyo, Tokyo 113 8656, Japan; 3. School of Naval Architecture, Dalian University of Technology, Dalian 116024, Liaoning, China |
| Abstract: | Influence of splitter plate length on characteristics of flow past a circular cylinder at high Reynolds numbers is investigated using large eddy simulation (LES). Lift coefficients, drag coefficients, Strouhal numbers and vortex shedding patterns of different splitter plate lengths are compared and analyzed. The results of analysis show: based on the time histories of lift coefficients and drag coefficients, the splitter plate lengths could be divided into three regimes, which are the stable regime I (when the splitter plate length L=0D, D is the diameter of the circular cylinder), the unstable regime II (L=0.5D-1.0D), and the stable again regime III (L=1.5D-8.0D). When splitter plate length changes from regime I to regime II, there is a sudden drop of Strouhal number. When splitter plate length changes from regime II to regime III, there is a sudden increase of Strouhal number. With the increase of splitter plate length, the vortex shedding pattern of flow field changes from 2S to 2P. |
| Keywords: | Circular cylinder Splitter plate Large eddy simulation High Reynolds numbers Flow characteristics |
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