| 引用本文: | 邹琳,刘健,吴伟男,闫豫龙,魏翼鹰.三维错列双波浪锥柱绕流流动特性数值仿真[J].哈尔滨工业大学学报,2022,54(1):163.DOI:10.11918/202107056 |
| ZOU Lin,LIU Jian,WU Weinan,YAN Yulong,WEI Yiying.Numerical simulation of flow around two staggered three-dimensional wavy conical cylinders[J].Journal of Harbin Institute of Technology,2022,54(1):163.DOI:10.11918/202107056 |
|
| 摘要: |
| 利用大涡模拟分析了雷诺数Re=3 900下间距比为L/Dm=4和5、交错角为α=0~15°的错列双波浪锥柱升阻力特性、流场结构及尾迹干涉效应。研究发现:对于特定间距比L/Dm=4、5,下游波浪锥柱脉动升力系数得到显著提高,在α=10°时较单直圆柱分别提升20.1倍和21.4倍,这主要是由上游波浪锥柱尾涡卷起撞击在下游波浪锥柱的一侧,下游波浪锥柱表面产生周期性的耦合力导致；受上游波浪锥柱两个自由端及其侧面来流与下游波浪柱作用产生的回流区的影响,下游波浪锥柱时均阻力系数显著降低。随着交错角增加,对于间距比L/Dm=4、5,下游波浪锥柱时均阻力系数逐渐接近上游柱,且在α=10°时,时均阻力系数较单圆柱分别降低34.9%和18.8%。涡量图展示了错列双波浪锥柱之间的完全撞击状态,侧面撞击状态和尾流干扰状态；且由于波浪锥柱表面形状的影响,使得流经波浪锥柱后方的尾涡存在明显分层现象,侧面撞击状态相对于其他两种状态能提供更大的脉动升力系数。本文研究结果可为风力俘能结构列阵的布局提供理论支持。 |
| 关键词: 波浪锥柱 交错角 大涡模拟 升阻力特性 流动结构 |
| DOI：10.11918/202107056 |
| 分类号:TU311 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(11972268) |
|
| Numerical simulation of flow around two staggered three-dimensional wavy conical cylinders |
|
ZOU Lin,LIU Jian,WU Weinan,YAN Yulong,WEI Yiying
|
|
(School of Mechanical and Electrical Engineering, Wuhan University of Technology, Wuhan 430000, China)
|
| Abstract: |
| In this paper, the lifting and drag characteristics, flow field structure and wake interference effects of two staggered wavy conical cylinders with center-to-center pitch ratios of L/Dm=4 and 5 and staggered angles of α=0~15° at Reynolds number 3900 are studied by large eddy simulation. The results show that the trailing vortex of the upstream wavy conical cylinder curls up and impacts on the side of the downstream wavy conical cylinder, which causes periodic coupling force on the surface of the downstream wavy conical cylinder, resulting in the increase of the fluctuating lift coefficient. At α=10° the fluctuating lift coefficient is 20.1 times and 21.4 times higher than that of single straight cylinder, respectively. Under the influence of two free ends of the upstream wavy conical cylinder and the backflow area generated by the interaction between the upstream wavy conical cylinder and the downstream wavy conical cylinder, the time-average drag coefficient of the downstream wavy conical cylinder is significantly reduced, and with the increase of the staggered angle, the time-average drag coefficient of the downstream wavy conical cylinder gradually approaches that of the upstream wavy conical cylinder. At α=10°, the time-average drag coefficient is 34.9% and 18.8% lower than that of a single cylinder, respectively. The flow around the staggered double wavy conical cylinders shows the flow structures of complete impact, side impact and wake disturbance et al. Because of the shape of the wavy conical cylinder, the flow field passing through the wavy conical cylinder presents strong three-dimensional characteristics, and the trailing vortex has obvious stratification, and the side impact condition provides a larger fluctuating lift coefficient than the other two. The results in this paper can provide theory support for the array layout of wind floating structure. |
| Key words: wavy conical cylinder stagger angle large eddy simulation lift and drag characteristic flow structure |
