EXPERIMENTAL STUDY OF THE EFFECT OF RPM VARIATION ON THE PERFORMANCE OF AN AXIAL FAN WITH 8 BLADES

Abstract

This study aims to evaluate the performance of a direct-drive axial fan by observing the effect of rotational speed (RPM) variations on velocity, static pressure, airflow rate, and power coefficient. Data collection was carried out experimentally with RPM variations of 1330, 1280, 1230, and 1180, as well as by closing the outlet section at three levels of blockage: 30%, 60%, and 100%. Air velocity was measured using an anemometer, RPM was measured using a tachometer, and pressure was measured using a manometer.The results show that at 1330 RPM, the air velocity reached 20.82 m/s, the airflow rate was 3.19 m³/s, the pressure was 247 Pa, and the power coefficient was 6.557. At 1280 RPM, the air velocity was 18.90 m/s, the airflow rate was 2.90 m³/s, the pressure was 220 Pa, and the power coefficient was 5.702. At 1230 RPM, the air velocity was 13.47 m/s, the airflow rate was 2.07 m³/s, the pressure was 207 Pa, and the power coefficient was 5.615. At 1180 RPM, the air velocity was 13.46 m/s, the airflow rate was 2.06 m³/s, the pressure was 187 Pa, and the power coefficient was 4.497.