横向振荡板的尾流研究

Study on the wake of transverse oscillating plates

目的:在不同的振频和振幅条件下找出三种典型的漩涡脱落模式,即2P、2S以及P+S模式,并在(A/H,V_∞/fH)平面上画出了旋涡脱落模式的分布图,寻找漩涡脱落规律。方法:通过风洞实验和数值模拟方法研究在Re=2300、无量纲振幅A/H=0.5~2.0、无量纲振频fH/V_∞=0.03~0.2时,观察烟线结果与数值模拟结果是否一致,随后再通过热线测量与数值模拟的结果进行对比,进一步证明实验的准确性。结果:找到了三种漩涡脱落模式的典型工况,还发现了较为少见的模式,即2P+2S模式,四种模式下实验结果与数值模拟结果基本一致。结论:随着板振幅和振频的改变,漩涡脱落模式也不断改变,数值模拟能够较好地模拟实验时的真实情况,可以为之后研究横向振荡板的尾流提供参考。

Aims:This paper aims to find three typical vortex shedding modes under different vibration frequency and amplitude conditions,namely the 2 P,2 S and P+S modes.The vortex shedding on the(A/H,V_∞/fH)plane Pattern distribution map was drawn to look for the vortex shedding law.Methods:Through the wind tunnel experiment and the numerical simulation method,it was studied whether the smoke line result and the numerical simulation result were consistent when Re=2300,dimensionless amplitude A/H=0.5~2.0,and dimensionless vibration frequency fH/V_∞=0.03~0.2.It was then compared with the results of numerical simulation through hot-line measurement to further prove the accuracy of the experiment.Results:The typical working conditions of the three vortex shedding modes were found and a relatively rare mode was also found,namely the 2 P+2 S mode.The experimental results in the four modes were basically consistent with the numerical simulation results.Conclusions:As the amplitude and vibration frequency of the plate change,the vortex shedding pattern also changes continuously.The numerical simulation can better simulate the real situation during the experiment and provide a reference for the study of the wake of the transverse oscillation plate.