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首页> 外文期刊>Journal of structural engineering >Suction and Action Mechanisms of Flow Field in a Super-Large Cooling Tower in Typhoon Conditions
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Suction and Action Mechanisms of Flow Field in a Super-Large Cooling Tower in Typhoon Conditions

机译：台风条件超大冷却塔流场的抽吸与动作机制

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Wind load is the designed control load for super-large cooling tower (SLCT) structures. Studies on wind resistance of those structures have focused mainly on normal winds, not on the influence of strong typhoons, or in particular the values of suction. To study the suction distribution and action mechanism of flow fields in an SLCT in typhoon conditions, in this study a high temporal-spatial resolution simulation of Typhoon Megi was done using a mesoscale weather research and forecasting (WRF) model with a multiple nesting structure. The wind velocity profile in the simulated region was gained through least squares fit. The research object was the world's highest cooling tower (220 m) at the Lu'an power plant in Shanxi Province, China. Three-dimensional (3D) computational fluid dynamics (CFD) wind field simulations of this tower in normal-wind and typhoon conditions were done based on a mesoscale-microscale nesting technology. A comparative analysis on the 3D effect of wind loads on the internal surface of an SLCT in a typhoon was also done, as was a summary of the meridian and circumferential distribution laws of the internal pressure coefficients. Differences on flow field characteristics, pressure coefficients, drag coefficients, and wind resistance in the tower structure in normal-wind and typhoon conditions and relative causes were investigated. Finally, the recommended values of suction in an SLCT in typhoon conditions are proposed. Results demonstrate that a WRF-CFD coupling model can effectively simulate the near-surface 3D wind field of an SLCT in typhoon conditions. Compared with a normal wind, the high wind velocity and strong turbulence of a typhoon causes larger-scale vortices inside the cooling tower, a more turbulent airflow on the leeward side, and a longer development area of vortices. In typhoon conditions, the internal pressure coefficient of the tower increased when the ventilation rate of the louver was 15%, 30%, and 100%. The overall internal pressure coefficient was found to be -0.61, -0.36, -0.34, and -0.42 when the ventilation rates of the louver are 0%, 15%, 30%, and 100%, respectively. (C) 2021 American Society of Civil Engineers.
机译：风负荷是用于超大型冷却塔（SLCT）结构的设计控制负载。这些结构的抗风阻力的研究主要集中在正常风中，而不是强大的台风的影响，或特别吸力的值。为了研究台风条件下的SLCT中流场的抽吸分布和动作机制，在本研究中，使用具有多个嵌套结构的Mescle天气研究和预测（WRF）模型来完成台风Megi的高时 - 空间分辨率模拟。通过最小二乘拟合获得模拟区域中的风速曲线。研究对象是中国山西省鲁安电厂的最高冷却塔（220米）。在正常风和台风条件下该塔的三维（3D）计算流体动力学（CFD）风场模拟基于Mescle-Microscale嵌套技术完成。还完成了对台风中SLCT内表面上的风力载荷的3D效应的比较分析，如内部压力系数的子午线和周向分布规律的概要。研究了正常风中塔结构中的流场特性，压力系数，拖曳系数和抗风阻力的差异。最后，提出了在台风条件下SLCT中的推荐抽吸值。结果表明，WRF-CFD耦合模型可以有效地模拟台风条件中SLCT的近表面3D风电场。与正常的风相比，台风的高风速和强大的湍流导致冷却塔内部更大的涡流，在背风侧更大的湍流气流，以及涡流的更长的开发区域。在台风条件下，当百叶窗的通风率为15％，30％和100％时，塔内部压力系数增加。当百叶窗的通风率分别为0％，15％，30％和100％时，发现总内部压力系数为-0.61，-0.36，-0.34和-0.42。 （c）2021年美国土木工程师协会。

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