| 引用本文: | 余文林,柯世堂.基于风-雨双向耦合的大型冷却塔结构响应[J].哈尔滨工业大学学报,2018,50(12):114.DOI:10.11918/j.issn.0367-6234.201804026 |
| YU Wenlin,KE Shitang.Structural responses of large cooling tower based on bidirectional coupling between wind and rain[J].Journal of Harbin Institute of Technology,2018,50(12):114.DOI:10.11918/j.issn.0367-6234.201804026 |
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| 摘要: |
| 暴风雨天气下,降雨会直接改变结构表面气动载荷并进一步影响风的湍流作用,然而现行冷却塔结构抗风设计均忽略了降雨带来的附加效应.为探究风-雨作用对冷却塔结构受力性能的影响,以中国西北地区已建成的210 m世界最高冷却塔为例,基于风-雨双向耦合算法,首先采用计算流体动力学（computational fluid dynamics,CFD）技术进行3种典型风速下冷却塔结构周边风场模拟,然后添加离散相模型（discrete phase model,DPM）开展9种不同风速-雨强组合的风雨耦合同步迭代计算.在此基础上,对比研究不同风速-雨强组合对塔筒表面雨滴运行轨迹以及雨量的影响规律,然后提出大型冷却塔风雨耦合等效压力系数的拟合公式.最后,结合有限元方法建立不同工况的大型冷却塔等效荷载耦合模型,对比研究不同风速-雨强组合下大型冷却塔塔筒、支柱和环基的结构响应.研究可为此类大型冷却塔在极端气候和复杂工况下的荷载预测提供参考. |
| 关键词: 冷却塔 CFD模拟 双向耦合 有限元分析 结构响应 |
| DOI：10.11918/j.issn.0367-6234.201804026 |
| 分类号:TU279.7+41 |
| 文献标识码:A |
| 基金项目:国家自然科学基金NSFC-RGC合作研究项目(51761165022)；国家自然科学基金(U9,1) |
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| Structural responses of large cooling tower based on bidirectional coupling between wind and rain |
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YU Wenlin,KE Shitang
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(Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)
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| Abstract: |
| Under the stormy weather, rainfall directly changes the aerodynamic force of the structural surface and further affects the turbulence action of wind, but current wind resistance designs for cooling towers all ignore the additive effects of rainfall. To explore the effects of wind-rain on mechanical properties of cooling tower structures, a domestic large cooling tower which is the world’s tallest (210 m) was taken as an example, and based on wind-rain bidirectional coupling algorithm, the flow fields of cooling tower under three typical wind speeds were simulated based on computational fluid dynamics (CFD) technology. The discrete phase model (DPM) were added and the iterative computations of rain-wind coupling of 9 different combinations of wind speed-rain intensity were carried out. On this basis, the influence laws of different combinations of wind speed-rain intensity on rain drops moving trajectory and rainfall on tower drum surface were studied. Then the fitting formulas of equivalent pressure coefficients were proposed. The coupling models of the large cooling tower under different working conditions were established by the finite element method, and the structural responses of tower drum, pillars, and ring foundation under different wind speed-rain intensity combinations were compared. The research provides references for load forecast of such large cooling towers under extreme climates and complex working conditions. |
| Key words: cooling tower CFD simulation bidirectional coupling finite element analysis structural response |
