Wind field driving mechanism and extreme wind load model of a super-large cooling tower under downburst

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (22) : 23-32.

HAN Guangquan，KE Shitang，YANG Jie，LI Wenjie，REN Hehe

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Abstract

Wind load is the control load for structural design of super-large cooling tower. Existing standard wind load distribution models all focus on normal wind climate. However, it lacks models of wind field action mechanism and wind load distribution under specific wind effects like downburst. Firstly, three-dimensional unsteady wind field of downburst was simulated by the impact jet model and large eddy simulation (LES), and wind field characteristics of vortex ring movement and wind speed changes were analyzed. Secondly, the world-highest cooling tower (228m) in Jinshan Power Plant in Inner Mongolia was chosen for the case study. Flow field characteristics and transient distribution of wind pressure coefficient at different radial positions of the tower in a wind field as well as the time-history distribution characteristics of mean lift/drag coefficient were disclosed. Thirdly, the extreme wind effect was considered under the normal wind. The simulation results and wind pressure of specification envelope were compared and analyzed. Results demonstrated that a series of vortex rings which move radially and rotate counter reversely were produced during the initiation of downburst. Wind speed at different radial positions fluctuated continuously. A high-pressure area was formed on the external windward surface and internal leeward surface when vortex rings impacted onto the tower body. Meanwhile, vortexes were formed inside the tower and wake zone of leeward surface. The time-history wind pressure coefficient on internal and external surfaces showed evident pulsation trend. Besides, there’s a significant oscillation at the bottom zone, which was related with influences of vortex rings. The lift coefficient of the cooling tower was basically 0. The mean drag coefficient of the layer gradually increases from the top of the tower along the height of the tower, and reaches the maximum value at the bottom of the tower. The impact of the vortex ring on the cooling tower is very likely to cause the instantaneous extreme wind load to exceed the normal wind limit of the specification, and then it is easy to cause structural damage.
Keywords: downburst; super-large cooling tower; flow field characteristics; wind pressure distribution;lift/ drag coefficient; extreme wind load

Key words

downburst / super-large cooling tower / flow field characteristics / wind pressure distribution;lift/ drag coefficient / extreme wind load

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HAN Guangquan，KE Shitang，YANG Jie，LI Wenjie，REN Hehe. Wind field driving mechanism and extreme wind load model of a super-large cooling tower under downburst[J]. Journal of Vibration and Shock, 2022, 41(22): 23-32

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