Determinación del ruido de un ventilador doméstico mediante herramientas computacionales.

Abstract

The aeroacoustic design of axial fans plays an important role in controlling the noise generated. That is why this work consists of a physical and a numerical experimental phase of a fan with high noise emission and the comparison of these results using computational tools such as ANSYS FLUENT, this in order to determine the sources of aerodynamic noise of the fan. . This is done using ANSYS methodologies such as the Ffowcs Williams –Hawkings (FW & H) acoustic analogy and the brandband noise sources model, to determine the sound level power on the surfaces of the propeller. To evaluate the noise generated by a fan, a 3-blade domestic fan was selected, with a diameter of 18 in, and a power of 130 watts, two propeller prototypes were designed, the original one and two proposals to reduce the noise, were simulated with the same parameters of the original propeller and with the same locations of the receivers, resulting in a very low noise decrease and little perception for the human ear. Through these designs it was possible to reduce the sound pressure level from 1 to 3 dB, depending on the location of the microphones. The experimental evaluation of the noise generated by the fan was carried out by applying the ISO 13347 part 3 standard, which in general must be carried out in a spacious and closed room, with minimum external noise levels so that operating noises are not distorted. of the propeller. 4 microphones were used at a distance of 50 cm apart and at an angle of 30 ° between each receiver