Numerical simulation on aeolian noise generated by single and twin bundled conductors

Numerical simulation using a hybrid method was employed to analyze the aeolian noise generated by single and twin bundled conductors. The calculating model of the single conductor was built based on its stranded shape. The wind and acoustic field of the single conductor were analyzed and compared with those of a smooth circular cylinder with the same diameter. Finally, the wind and the acoustic field of the twin bundled conductors in horizontal and vertical arrangements were also studied. Results show that drag coefficient and sound pressure level (SPL) of the single conductor are smaller than those of the smooth circular cylinder with the same diameter, whereas the Strouhal number of the conductor are bigger than that of the circular cylinder. In the dominating frequency range, the SPL directionality of the conductor and circular cylinder has a shape of figure-of-eight, and in the range away from the dominating frequency, the SPL directionality has a shape of circle, indicating that the aeolian noise generated by conductors and circular cylinders belongs to the dipole type of acoustic source. The overall sound pressure level (OASPL) of the conductors and the circular cylinder has a shape of almost circle shape and a little bit shape of figure-of-eight. The OASPL of the twin bundled conductors in vertical arrangement are equaled to that of the two single conductors. The OASPL of the twin bundled conductors in vertical arrangement are slightly smaller than that of the twin bundled conductors in horizontal arrangement. © 2020, Editorial Office of Journal of Vibration and Shock. All right reserved.