大湍流度高雷诺数时并列双圆柱的平均和脉动压力分布

PRESSURE DISTRIBUTIONS ON TWO CIRCULAR CYLINDERS OF SIDE-BY-SIDE ARRANGEMENTS IN HIGH-TURBULENCE FLOW AT HIGH REYNOLDS NUMBER

摘要: 本文通过风洞实验研究了来流湍流度,Iu=10％雷诺数分别为Re=1.95×10~9和Re=6.5×10~5时单个圆柱和不同间距比下并列双圆柱的平均和脉动压力分布。结果表明:在Re=1.95×10~5时单个圆柱的平均压力分布类似于低湍流度高超临界雷诺数时的压力分布;当雷诺数增大至6.5×10~5时,绕圆柱表面流动的分离点前移和背压绝对值提高,总的阻力系数随之增加。并列双圆柱的间距比变化对圆柱表面压力分布影响很大,在极小间距比(N/d=1.05)时,双圆柱间的缝隙流使附近柱面产生高达-5的压力系数峰值(Re=6.5×10~5),同时脉动压力也大为增加;在较小间距比时(1.5

Abstract: This paper presents time-mean as well as fluctuating pressure distributions on single and two identical circular cylinders of side-by-side arrangements under various gap ratios N/d, which were tested in high-turbulence flow (1u=10%) at two high Reynolds numbers Re of 1.95×105 and 6.5 × 10" respectively.The results show that due to the high-turbulence in oncoming flow, the flow around single cylinder at Re = 1.95×105 becomes turbulent separated. The spectrum-analysis shows, that the vortex shedding from the ...