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| Internal pressure of cylinder-conic section steel cooling towers under wind-rain two-way considering wind velocity and rain intensity |
| DU Lingyun1,2, KE Shitang1 |
1.Department of Civil Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2.Envision Energy(Jiangsu)Co.,Ltd.,Shanghai 200050,China |
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Abstract As a kind of novel cylinder-conic section steel cooling tower, the distribution of aerodynamic force on internal surface of tower drum is obviously different from traditional hyperbolic concrete cooling towers because of its unique structure form.Under extreme weather conditions with strong wind along with rainstorm, the rainstorm will affect the aerodynamic force on internal surface directly and change the turbulent effect of fluctuating wind.However, traditional researches have only paid attention to shock effect on the structure surface from wind driven rain.In order to solve this problem, aiming at a domestic novel straight cylinder-straight section steel cooling tower (189 high) under construction, the wind-rain two-way coupling algorithm as the core, the wind field and rain drops are simulated respectively by using continuous and discrete phase model based on CFD numerical simulation.The influence laws of parameters under different scenarios of wind speed and rainfall intensity were studied.The action mechanism of wind speed streamline and turbulence intensity in wind field of rain drops moving speed and trajectory inside the tower drum were revealed.The most unfavorable conditions of different wind speed and rain intensity combination and its internal pressure coefficient distribution character were extracted.
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Received: 26 July 2017
Published: 15 December 2018
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