顺向正弦来流条件下圆柱气动力和绕流流场数值模拟研究  

Numerical study on the aerodynamic forces and flow around a circular cylinder under streamwise sinusoidal inflow condition

作　　者：于春放 靖洪淼 王仰雪 张记涛 邵林媛 刘庆宽 YU Chunfang;JING Hongmiao;WANG Yangxue;ZHANG Jitao;SHAO Linyuan;LIU Qingkuan(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [3]河北省风工程和风能利用工程技术创新中心,石家庄050043

出　　处：《振动与冲击》2024年第6期216-224,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金青年项目(52208494);河北省自然科学基金青年项目(E2021210063);河北省自然科学基金创新研究群体项目(E2022210078);河北省高端人才项目(冀办[2019]63号);石家庄铁道大学研究生创新资助项目(YC2023065;YC2023068)。

摘　　要：为深入了解顺向阵风来流对圆柱气动力和流场特性的影响,开展了雷诺数(Re)为1000的圆柱绕流三维大涡模拟,研究了不同频率顺向正弦来流对圆柱气动力和流场结构的影响规律,详细分析了升阻力系数、斯特劳哈尔数(St)、回流长度、分离角和尾流结构等参数的变化规律。顺向正弦来流速度为U=U_(0)+Asin(2πft),其中来流频率f的变化范围为0~0.3 Hz,U_(0)为平均速度,A为竖向正弦来流的振幅,设为0.15U_(0)。研究结果表明:圆柱阻力系数卓越频率(即主导频率)与正弦来流频率基本一致,升力系数存在3个明显的频率峰值,分别对应涡脱频率与来流频率之差、涡脱频率、涡脱频率与来流频率之和。随着正弦来流频率f增大,St先减小后增大,在f=0.25 Hz时达到最小值,而回流长度先增大后减小,且在f=0.15 Hz时达到最大值。当f≤St时,分离角不变,而顺流向最小速度逐渐增大;当f>St时,分离角逐渐增大.In order to further understand the influence of streamwise gust inflow on the aerodynamic behavior of a flow rounded circular cylinder,a 3D large eddy simulation of flow around the circular cylinder with Reynolds number(Re)of 1000 was carried out to investigate the influence of streamwise sinusoidal inflow with different frequencies on the aerodynamic forces and flow field.The lift and drag coefficients,Strouhal number(St),recirculation length,separation angle and wake structure were analyzed in detail.The velocity of streamwise sinusoidal inflow was set as U=U_(0)+A sin(2πft),where the frequency of the inflow ranged from 0 to 0.3 Hz,U_(0) was the mean velocity,A was the amplitude of the inflow and it was assumed A=0.15 U_(0).The results indicate that the dominant frequency of the drag coefficient is substantially consistent with the frequency of the inflow.There are three obvious peak values of the lift coefficient at the frequencies corresponding to the vortex shedding frequency minus inflow frequency,vortex shedding frequency,and vortex shedding frequency add inflow frequency.The St is reduced first and then increased,with increase of the sinusoidal inflow frequency.The minimum of St is obtained when f=0.25 Hz,while the recirculation length is increased first and then decreased,and the maximum value is obtained when f=0.15 Hz.The separation angle is unchanged when f≤St,and the minimum streamwise velocity gradually increases;nevertheless,the separation angle gradually increases when f>St,and the minimum streamwise velocity gradually decreases.

关 键 词：圆柱绕流 大涡模拟 顺向正弦来流 气动力 流场 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]