FLUCTUATING LIFT AND DRAG FORCES ON FINITE LENGTHS OF A CIRCULAR CYLINDER IN THE SUBCRITICAL REYNOLDS NUMBER RANGE
FLUCTUATING LIFT AND DRAG FORCES ON FINITE LENGTHS OF A CIRCULAR CYLINDER IN THE SUBCRITICAL REYNOLDS NUMBER RANGE
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DOI：
10.1006/jfls.1996.0070
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发表时间：
1997-02
影响因子：
3.6
通讯作者：
G. West;C. Apelt
中科院分区：
文献类型：
--
作者：
G. West;C. Apelt
在长的光滑圆柱体上测量了脉动压力和基本脉动力的展向互相关，圆柱体的端板位于展向中心部分，其中存在“长”圆柱体条件。这些数据是在亚临界雷诺数104至2.1 × 105范围内，阻塞比为0.0425、0.06和0.095，湍流度为0.002、0.0125、0.03、0.055和0.075时获得的。通过使用互相关曲线，已经计算出允许r.m.s.有限长“长”圆柱体的力系数由基本力系数导出。这些转换因子已被应用到以前测得的基本力系数，以产生系数的r.m.s.对于上述条件范围，有限长度圆柱体的力可达50个直径。
Spanwise cross-correlations of fluctuating pressures and of elemental fluctuating forces have been measured on long smooth circular cylinders with end plates in the central part of the span where "long" cylinder conditions exist. The data have been obtained at subcritical Reynolds numbers over the range 104 to 2·1 × 105 for blockage ratios 0·0425, 0·06 and 0·095 and at turbulence levels of 0·002, 0·0125, 0·03, 0·055 and 0·075. By use of the cross-correlation curves, factors have been calculated which allow the r.m.s. force coefficients for finite lengths of "long" cylinders to be derived from elemental force coefficients. These conversion factors have been applied to previously measured elemental force coefficients to produce coefficients of r.m.s. forces for finite lengths of cylinder up to 50 diameters for the ranges of conditions detailed above.