Abstract
The three-dimensional turbulent flow was calculated using the large eddy simulation (LES) to solve the flow around a polymer insulator with/without a Core and its aerodynamic noise by OpenFOAM with Curle's equation. The resonance of aerodynamic noise also was measured using a low-noise wind tunnel. The diameter of the insulator Shed was varied at D = 129, 155, and 178 mm. The incline angle of the test model was varied from 0º to 30º. Vortices were generated independently from the Core (cylindrical shape) and the Shed (disk shape). The separated vortices from the Shed have a higher frequency than the wake vortices of the Core. The sound pressure level of a high frequency increases with increasing the incline angle. The frequency of the separated vortices from the Shed depends on the thickness at the tip. It was found that the resonance of high-frequency aerodynamic noise generated by polymer insulators has a source in the separated vortices from the Shed.
