【摘要】 为了研究电厂超大型排烟冷却塔结构的稳定性能,进行群塔刚体测压和气弹测振模型风洞试验,获得计算风致稳定性所需的表面压力极值分布模式、多塔比例系数和风振系数等参数,采用有限元数值模拟方法和自行编制的前、后处理程序验算了排烟冷却塔的局部、整体稳定性能和极限承载力.计算结果表明:烟道周边壳体局部稳定性安全因子低于规范最小值,必须采取加固措施;加固后冷却塔整体最不利失稳临界风速大于设计检验风速,且考虑内吸力影响会使其有30%左右的下降幅度;施工状态承载力验算表明,随着施工高度的上升,临界风速逐渐降低,当施工模板层数达到100时,其临界风速为119.41 m/s,远大于当地50 a一遇年最大风速(24 m/s).更多还原

【Abstract】 In order to research the stability performance of cooling tower with gas flue in Xuzhou power plant,the rigid model and aero-elastic model ofsome super large cooling tower in Tongji TJ-3 wind tunnel are carried out,the parameters taken to calculate the wind-induced stability performance are gained in the test,with the numerical simulation and the post processor the local and whole stability are analysed.It is found that the local stability safety factor is lower than the norm value,so the reinforcement scheme must be adopted;the whole stability critical wind speed is higher than the designed wind velocity,the critical wind speed would reduce 30% when considering the internal suction;the critical wind speed is gradually small with the increase of the moulding board,the value is 119.41 m/s when the moulding board is 100,which is much higher than the maximum wind speed.更多还原