摘要
基于计算流体动力学方法,以某桁架桥为研究对象,建立三维仿真模型进行气动性能研究。通过对比三维气动仿真结果与风洞试验结果可知,三维气动仿真分析能够较为精确地计算出在不同风攻角下桁架桥的三分力系数。结合风洞试验结果以及二维气动仿真分析结果对国内现行规范中桁架桥气动参数选取方法的精确性做出检验并提出改进建议。将桁架结构截面的外轮廓和实面积比作为控制条件建立二维等效模型,在不同风攻角下其阻力系数计算结果与规范建议方法计算结果相比精度有较大提高。
Based on computational fluid dynamics and taking a truss bridge as the research object,this paper constructed a three -dimensional simulation model to study the aerodynamic characteristic.By comparing the re-sults of the three -dimensional aerodynamic simulation and wind tunnel test results,the three -dimensional aer-odynamic simulation analysis is found more accurate in calculating the coefficient truss bridge thirds of the wind at different angles of attack.Combining the aerodynamic wind tunnel test results and the simulation results,the accuracy of the aerodynamic parameter selection methods of the existing codes is checked and some recommenda-tions for improvement are made.This paper built two -dimensional equivalent model on controlling condition of the outer section of the truss structure and the real area ratio.The precision of the drag coefficient between 2D e-quivalent model and the method of the code is improved greatly.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2015年第4期852-858,共7页
Journal of Railway Science and Engineering
关键词
计算流体动力学
湍流模型
桁架断面
气动特性
computational fluid dynamics
turbulence model
truss girder cross -section
aerodynamic charac-teristic
