Tapering is a common morphological modification to ensure the stability of civil structures, especially as more and more high-rise buildings push the skyline of modern cities. However, the aerodynamics, aeroelasticity, and fluid-structure-interaction of tapering remain far from been fully understood. Through wind tunnel tests, the present work offers some notable observations on the effects of tapering, specifically considering different wind attack angles, wind velocities, and structural rigidities. A novel phenomenon unique to tapering is discovered and termed as partial reattachment. It depicts the partial reattachment of a shear layer onto a tapered structural face, which suppresses vortex shedding in reattached regions and forms a separation envelope. It also propagates from structural base to the free end with an increasing wind attack angle, and ultimately transforms into complete reattachment. Consequently, behavioral bi-polarities in force, vortex shedding characteristics, and cross-point correlation are observed. Aeroelastically, tapering promotes the unsteady effect and the VIV-galloping interaction near the free-end, making the prism more susceptible to wind-induced vibrations. With aeroelasticity, partial reattachment also introduces a discontinuous vortex shedding phenomenon, which is subjected to an intensity demarcation.

逐渐变细是一种常见的形态修改形式，可确保土木结构的稳定性，尤其是在越来越多的高层建筑推动现代城市天际线发展时。然而，渐缩的空气动力学，空气弹性和流体-结构相互作用仍然远远没有被完全理解。通过风洞测试，目前的工作对渐缩的影响提供了一些值得注意的观察结果，特别是考虑到不同的迎风角度，风速和结构刚度。发现了一种逐渐变细的独特现象，并将其称为部分重新附着。它描绘了剪切层在锥形结构面上的部分重新连接，该结构可抑制重新连接区域的涡旋脱落并形成分离包络线。它也以增大的风侵角从结构基础传播到自由端，最终转变为完全重新连接。因此，观察到力的行为双极性，涡旋脱落特性和交叉点相关性。通过气弹作用，锥度促进了不稳定效应和自由端附近的VIV振颤相互作用，使棱镜更容易受到风振的影响。由于具有空气弹性，部分重新附着还会引入不连续的涡旋脱落现象，该现象会受到强度划分。