电厂超大型排烟冷却塔风洞试验与稳定性分析
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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).
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.
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.
引文
[1]ARMITT J.Wind loading on cooling towers[J].Journalof Structural Division,1980,106(ST3):623-641.
[2]李鹏飞,赵林,葛耀君.超大型冷却塔风荷载特性风洞试验研究[J].工程力学,2008,25(6):60-67.
[3]张彬乾,李建英,阎文成.超大型双曲冷却塔双塔干扰的风荷载特性研究[J].流体力学试验与测量,2003,17(特刊):93-97.
[4]刘天成,赵林,丁志斌.圆形截面冷却塔不同表面粗糙度时绕流特性的试验研究[J].工业建筑,2006,36(396):301-304.
[5]赵林,葛耀君,许林汕,等.等效静风荷载下超大型冷却塔受力性能分析[J].工程力学,2008,25(7):79-86.
[6]柯世堂,赵林,葛耀君.大型双曲冷却塔气弹模型风洞试验和响应特性[J].建筑结构学报,2010,31(2):61-68.
[7]赵林,宋锦忠,高玲等.冷却塔群塔刚体测压试验研究[J].试验流体力学与测量,2007,21(2):56-62.
[8]GB/T 50102—2003.工业循环水冷却设计规范[S].北京:中华人民共和国建设部,2003.
[9]DL/T 5339—2006.火力发电厂水工设计规范[S].北京:中国电力出版社,2006.
[10]王铭,黄志龙.烟塔合一自然通风冷却塔的有限元分析[J].力学与实践,2006,26(68):2-4.
[11]KE Shitang,GE Yaojun,ZHAO Lin.Evaluation ofstrength and local buckling for cooling tower with gasflue[C]//Proceedings of the International Symposiumon Computational Structural Engineering.Shanghai:Springer,2009:545-551.
[12]柯世堂,赵林,葛耀君.超大型冷却塔结构风振与地震作用影响比较[J].哈尔滨工业大学学报,2010,42(10):1635-1641.
[2]李鹏飞,赵林,葛耀君.超大型冷却塔风荷载特性风洞试验研究[J].工程力学,2008,25(6):60-67.
[3]张彬乾,李建英,阎文成.超大型双曲冷却塔双塔干扰的风荷载特性研究[J].流体力学试验与测量,2003,17(特刊):93-97.
[4]刘天成,赵林,丁志斌.圆形截面冷却塔不同表面粗糙度时绕流特性的试验研究[J].工业建筑,2006,36(396):301-304.
[5]赵林,葛耀君,许林汕,等.等效静风荷载下超大型冷却塔受力性能分析[J].工程力学,2008,25(7):79-86.
[6]柯世堂,赵林,葛耀君.大型双曲冷却塔气弹模型风洞试验和响应特性[J].建筑结构学报,2010,31(2):61-68.
[7]赵林,宋锦忠,高玲等.冷却塔群塔刚体测压试验研究[J].试验流体力学与测量,2007,21(2):56-62.
[8]GB/T 50102—2003.工业循环水冷却设计规范[S].北京:中华人民共和国建设部,2003.
[9]DL/T 5339—2006.火力发电厂水工设计规范[S].北京:中国电力出版社,2006.
[10]王铭,黄志龙.烟塔合一自然通风冷却塔的有限元分析[J].力学与实践,2006,26(68):2-4.
[11]KE Shitang,GE Yaojun,ZHAO Lin.Evaluation ofstrength and local buckling for cooling tower with gasflue[C]//Proceedings of the International Symposiumon Computational Structural Engineering.Shanghai:Springer,2009:545-551.
[12]柯世堂,赵林,葛耀君.超大型冷却塔结构风振与地震作用影响比较[J].哈尔滨工业大学学报,2010,42(10):1635-1641.
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