串列双方柱体流体动力载荷研究

摘要: 本文通过流动显示,热线测频和流体动载荷测量在水槽中研究了绕经不同柱间距比S/D(S为双柱间距,D为柱体截面宽)串列双方柱体流动特性。实验雷诺数为Re=6×10~3,柱间距比0.5≤S/D≤10实验测量了涡脱落频率、时间平均阻力、动态阻力和动态升力。通过实验结果综合分析给出临界柱间距范围2.5≤(S/D)_(cr)≤3.0,并将串列双方柱流动随柱间距的变化划分为二种流态区。在临界柱间距,作用于双柱体的流体载荷、涡脱落频率以及流谱都发生跃变。文中分析讨论了两个流态区的特性以及在临界柱间距出现的双稳态特性。

Abstract: The characteristics of the flow past two square-section cylinders in a tandem arrangement were studied experimentally. The vortex-shedding frequencies, time-mean drag forces, time-varying lift and drag forces were obtained for various spacing ratios S/D(S, spacing; D, width of the cylinder). The Reynolds number of the experiment was 6×103, the spacing ratios were in the range 0.5 to 10. It was found .that the critical spacing ratios were in the range 2.5 to 3.0, and the flow can be divided into two regimes ...