用基于计算流体力学(CFD)的数值方法对开槽宽度为5.5,6.0和6.5m的双箱断面进行了气动性能分析,结果槽宽6.0m的双箱断面气动性能最优.通过1∶80节段模型试验,对槽宽6.0m的双箱断面、传统单箱断面和双箱格构断面的颤振临界风速进行测定,评价了3种断面气动性能的优劣.结果表明,3种断面———双箱断面、传统单箱断面和双箱格构断面的实测颤振临界风速都大于颤振检验风速,但传统单箱断面需采取气动控制措施. The aerodynamic performance of the double-box section with slot width of 5.5, 6.0 and 6.5 m was analyzed by numerical method based on computational fluid dynamics (CFD) In the section model test, the critical flutter velocities of the double box section with the slot width 6.0m, the traditional single box section and the double box section are measured, and the aerodynamic performance of the three sections is evaluated. The results show that the three sections --- Double box section, the traditional single box section and double box section of the measured flutter critical wind speed are greater than the flutter test wind speed, but the traditional single-box section need to take pneumatic control measures.