Caracterización experimental del desprendimiento de vórtices en cilindros circulares inclinados mediante análisis espectral de frecuencias

Abstract

CONDITION FOR PUBLICATION OF PROJECT. This study looks at how vortex shedding works in inclined circular cylinders. In this case, three-dimensional flow effects make traditional two-dimensional models less useful. The research was conducted experimentally in a wind tunnel utilizing hot-wire anemometry, and the Welch method was employed to analyze the power spectral density (PSD) of velocity fluctuations. The main goal of the analysis was to find the most important shedding frequencies and to look at the Strouhal number (St) along the cylinder’s normalized axial position (s/L). The experimental setup looked at a range of Reynolds numbers (Re), inclination angles (), and geometric configurations (upstream and downstream). The findings demonstrate that the wake does not display spatial characteristics. Along the cylinder axis, on the other hand, there are clear changes in the coherence of vortex shedding. In certain areas, distinct spectral peaks manifest, whereas in others, the flow structure becomes increasingly disordered. There are also changes in dominant frequencies and spectral broadening. In general, both the inclination angle and the axial position have a big effect on how energy is spread out when a vortex sheds. These results enable a quantitative spatial analysis of three-dimensional flow instabilities surrounding inclined cylinders, giving experimental insights into the behavior of this phenomenon under controlled conditions. Keywords: vortex shedding; inclined cylinder; Strouhal number; spectral analysis; three-dimensional flow