OCTAVE WAVE SOUND SIGNAL MEASUREMENTS IN DUCTED AXIAL FAN UNDER STABLE REGION AT THROTTLE POSITION 5 CM

Performance of axial fan is found to reduce drastically when instability is encountered during its operation. Performance of an axial fan is severely impaired by many factors mostly related to system instabilities due to rotating stall and surge phenomenon experienced during its operation. The present work involves measuring the Octave wave sound signal in ducted axial fan under stable region at throttle positions 5 cm from the casing. Objective of the experiment is to measure the frequency domain Octave wave sound signal sound level in terms of decibel and comprehend the sound Characteristics in ducted axial fan by using sound spectrum analyser. Different types of Octave wave sound signals have been measured under stable region at throttle position 5 cm from the casing for the frequency range from 11 Hz to 11100 Hz with respect to rotor speed and different graphs are plotted for ducted axial fan.