Abstract
The fluctuating aerodynamic force and wind pressure distribution characteristics of three equally spaced circular cylinders arranged inline at different incidence angles and spacing ratios were studied via rigid model pressure measurement wind tunnel tests. The results were compared with those of a single cylinder. The Reynolds number is 6.4 × 104. The range of incidence angle α and spacing ratio L/D (the ratio of the center distance between adjacent cylinders to the diameter of the cylinder) are 0°∼90° and 1.2 ∼ 4.0, respectively. The spacing ratio and incidence angle greatly influence the fluctuating aerodynamic force coefficients and wind pressure coefficients. According to the spacing ratio, the fluctuating aerodynamic characteristics can be roughly divided into three states: small spacing ratios (1.2 ≤ L/D ≤ 2.0), medium spacing ratios (2.0 < L/D < 3.5), and large spacing ratios (3.5 ≤ L/D ≤ 4.0). The interference effect in the fluctuating aerodynamic force and wind pressure coefficients in the three states is discussed. At small spacing ratios, the fluctuating aerodynamic force and wind pressure coefficients mainly experience a significant reduction effect. At medium and large spacing ratios, the interference effect is closely related to the incidence angle and spacing ratio.
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