塔架结构对风速和阻力系数影响的大涡流模拟

IF 1.1 Q4 METEOROLOGY & ATMOSPHERIC SCIENCES

Asian Journal of Atmospheric Environment Pub Date : 2024-07-12 DOI:10.1007/s44273-024-00036-x

Takenobu Michioka

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引用次数: 0

摘要

对圆柱形观测塔周围的流动进行了大涡流模拟，以研究塔结构对风速和阻力系数的影响。由于塔顶前缘发生了流体分离，因此塔上方的平均风速加快。阻力系数与雷诺切应力密切相关。在塔架上方，由于塔顶附近的速度梯度较陡，雷诺切应力在再循环区内由负值变为正值，并在塔架后半部分恢复为负值。雷诺切应力的变化导致阻力系数不准确。使用一个风速计时，塔顶上方 10 米以上的位置适合精确测量阻力系数。使用两个风速计时，可以更精确地测量雷诺剪应力。虽然不能完全消除塔架对阻力系数的影响，但使用两个风速计估算塔架的阻力系数是一种很有前途的方法。

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Large-eddy simulation of the effects of a tower structure on wind velocity and drag coefficient

A large-eddy simulation was implemented for the flow around a cylindrical observation tower to investigate the effects of the tower structure on wind speed and drag coefficient. The mean wind velocity accelerates above the tower because flow separation occurs at the leading edge of the top of the tower. The drag coefficient is strongly linked to the Reynolds shear stress. Above the tower, the Reynolds shear stresses change from negative to positive within the recirculation zone and return to a negative value in the latter half of the tower because of the steep velocity gradients near the top of the tower. The change in the Reynolds shear stress results in an inaccurate drag coefficient. When one anemometer is used, a location at over 10 m above the top of the tower is suitable for measuring the drag coefficient accurately. When two anemometers are used, the Reynolds shear stress can be measured more accurately. Although the effects of the tower on the drag coefficient are not entirely removed, the use of two anemometers is a promising approach to estimate the drag coefficient in a tower.