考虑风速和雨强组合风-雨双向作用下直筒-锥段型钢结构冷却塔内压作用研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (24) : 220-228.

论文

杜凌云1,2，柯世堂1

作者信息 +

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

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摘要

作为一种新颖的直筒-锥段型钢结构冷却塔，独特的结构形式导致塔筒内表面气动力分布与传统双曲线型混凝土冷却塔明显不同；尤其在强风暴雨极端气候条件下，暴雨亦会直接影响内表面气动力并改变脉动风的湍流效应，而传统研究大多仅关注风驱动雨对于结构表面的冲击效应。为解决该问题，本文针对国内某在建189m高新型直筒-锥段型钢结构冷却塔，以风-雨双向耦合算法为核心，基于CFD数值模拟采用连续相和离散相模型分别进行风场和雨滴模拟。在此基础上，研究不同风速和雨强的9种组合对塔筒内表面风驱雨量、雨滴附加作用力和等效内压系数的影响规律，揭示风-雨双向耦合作用下塔筒内部风场速度流线、湍动能强度、雨滴运行速度和轨迹的作用机理，提炼出不同风速和雨强组合的最不利工况及其内压系数分布特性。

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.

关键词

直筒-锥段型钢结构冷却塔 / 风-雨双向耦合 / 数值模拟 / 内表面气动力 / 流场作用机理

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杜凌云1,2，柯世堂1. 考虑风速和雨强组合风-雨双向作用下直筒-锥段型钢结构冷却塔内压作用研究[J]. 振动与冲击, 2018, 37(24): 220-228

DU Lingyun1,2, KE Shitang1. Internal pressure of cylinder-conic section steel cooling towers under wind-rain two-way considering wind velocity and rain intensity[J]. Journal of Vibration and Shock, 2018, 37(24): 220-228

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