| 二维环空管道后台阶突扩流动特性数值模拟分析 |
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| 引用本文： | 杨晓明,赵军,徐建树,仲志刚,孙业志,胡寿根.二维环空管道后台阶突扩流动特性数值模拟分析[J].上海理工大学学报,2010,32(4). |
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| 作者姓名： | 杨晓明 赵军 徐建树 仲志刚 孙业志 胡寿根 |
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| 作者单位： | 上海理工大学,能源与动力工程学院,上海,200093 |
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| 基金项目： | 上海市科学技术委员会基础研究重点资助项目，上海市重点学科建设资助项目 |
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| 摘 要： | 环空管道后台阶突扩流动是空气正循环钻井过程中十分重要的关键部分,直接决定了钻探岩屑是否能够顺利上返地面.该模型中对再附着过程的演变进行了大涡模拟(LES).指出在层流状态下主回流区长度随雷诺数Re的增加而增加;过渡流状态时出现内壁二次回流区,角部二次回流区和外壁三次回流区;湍流状态时,随着角部二次回流和外壁三次回流的消失,外管内壁和内管外壁处出现大尺度涡;得出了台阶上游和下游较远处流场层流时为抛物线分布,湍流时近似为对数分布.在此基础上进一步研究了湍流情况下流场中大尺度涡结构的瞬时发展和演变过程,以期实现对湍流的有效控制,并为进一步研究气体钻井环空管道内颗粒和大涡的相互作用规律奠定基础.
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| 关 键 词： | 回流区 大涡模拟(LES) 后台阶突扩流动 环空管道 |
Numerical investigation of two-dimensional flow over a backward-facing step of an annular tube |
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| YANG Xiao-ming,ZHAO Jun,XU Jian-shu,ZHONG Zhi-gang,SUN Ye-zhi,HU Shou-gen.Numerical investigation of two-dimensional flow over a backward-facing step of an annular tube[J].Journal of University of Shanghai For Science and Technology,2010,32(4). |
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| Authors: | YANG Xiao-ming ZHAO Jun XU Jian-shu ZHONG Zhi-gang SUN Ye-zhi HU Shou-gen |
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| Institution: | YANG Xiao-ming,ZHAO Jun,XU Jian-shu,ZHONG Zhi-gang,SUN Ye-zhi,HU Shou-gen (School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China) |
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| Abstract: | The evolution of the reattachment process in annular backward-facing step flow was simulated by large-eddy simulation(LES).It is shown that there appear successively the states of laminar flow,transitional flow and turbulent flow with the increase of Reynolds number.It is pointed out that the length of the main recirculation region increases with Reynolds number in the laminar flow state.The secondary reverse flow region is found at the inner wall of the outer pipe at Re>704.15 in the transitional flow stat... |
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| Keywords: | recirculation region large-eddy simulation backward-facing step sudden-expansion flow annular tube |
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