1000kV苏通大跨越输电塔线体系气弹模型的风洞试验研究  

Investigation on Wind Tunnel Tests of an Aeroelastic Model of 1000kV Sutong Long Span Transmission Tower-line System

作　　者：赵爽[1] 晏致涛[1] 李正良[1] 董建尧[2] 钟永力 ZHAO Shuang;YAN Zhitao;LI Zhengliang;DONG Jiangyao;ZHONG Yongli(School of Civil Engineering,Chongqing University,Shapingba District,Chongqing 400044,China;East China Electric Power Design Institute Co.,Ltd,Huangpu District,Shanghai 200001,China)

机构地区：[1]重庆大学土木工程学院,重庆市沙坪坝区400044 [2]华东电力设计院有限公司,上海市黄浦区200001

出　　处：《中国电机工程学报》2018年第17期5257-5265,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51478069);国家电网科技项目(SHJJGC1500142)~~

摘　　要：拟建的苏通大跨越输电线路是目前为止塔身最高、跨度最长的塔线体系,主要受风荷载控制。气弹模型的风洞试验是深入研究各种风致耦合振动现象的有效手段。由于风洞条件和模型材料的限制,模型设计需要放松输电塔的Froude数相似准则,采用Davenport提出的线模型等效设计方法。但这会引起塔线体系响应不匹配以及气动阻尼和质量不符合相似比等问题。通过增大输电线模型的刚度矩阵,不改变输电线模型垂度,推导输电线模型的精确气动力相似比等手段设计塔线体系气弹模型。将其放置于标定好的风场中,通过有限元分析梯度风对其的影响,测试单塔和塔线体系的风致响应,揭示位移、频率以及阻尼等塔线耦合的机理。试验结果表明：30o风向角时输电塔的位移响应最大;塔线耦合改变了输电塔的动力特性和风致响应分量;试验风速下的输电塔和导线均没有动力失稳。The proposed Sutong long-span electric transmission line is the highest tower-line system with the longest span so far, and thus mainly affected by wind load. Wind tunnel tests of the aeroelastic model are effective ways to further study these wind-induced coupled vibration phenomena. While due to the limit of wind tunnel conditions and model materials, the design of the aeroelastic model needed to loosen the similar criteria for Froude number of transmission towers and adopted the equivalent design method of line model proposed by Davenport. However, these can cause the mismatch response of the tower-line system and the discrepancy of the similarity ratios of the aerodynamic damping and the mass. The aeroelastic model of transmission tower-line system was designed by increasing the stiffness matrix while keeping the sag of the transmission line model, deriving the precise aerodynamic force similarity ratio of the transmission line model and adopting other methods. The designed model was put in a wind field with appropriate calibration and the influence of gradient wind was assessed by finite element analysis. Meanwhile, the wind-induced responses of transmission tower model with or without lines were tested. The mechanism of coupling between transmission tower and line about displacement, frequency, damping and so on was revealed. The tests results show that the displacement response of the transmission tower is the greatest when the yaw angle is 30 degrees; the coupling between transmission towerand line changes the dynamic characteristics and the wind-induced responses component of the transmission tower; transmission tower and conductors are both aerodynamically stable under test wind speed.

关 键 词：1000kV Froude数 塔线体系 气弹模型 风洞试验 梯度风 

分 类 号：TM754[电气工程—电力系统及自动化]