TIME DOMAIN SOUND SPECTRUM MEASUREMENTS IN DUCTED AXIAL FAN UNDER STALL REGION AT THROTTLE POSITION 2 CM

Abstract

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 time domain sound signal in ducted axial fan under stall region at throttle positions 2 cm from the casing. Objective of the experiment is to measure the time domain sound signal in terms of decibel and comprehend the sound Characteristics in ducted axial fan by using sound spectrum analyser. Different types of time domain sound signals have been measured under stall region at throttle position 2 cm from the casing for different rotor speed and different graphs are plotted for ducted axial fan.