Electric fan performance and noise modelling. An investigation of installation effects on the performance and the noise produced

Abstract

This thesis investigates the effects of installation configurations on the performance and acoustic output of an electric fan using computational approaches. The study focuses on the aerodynamic and acoustic characteristics of axial fans installed in various configurations, including the use of cylindrical ducts and bellmouths. A CFD model was developed and validated against experimental data to assess fan performance in terms of pressure rise and sound power. Key distortion metrics, such as the Circumferential Distortion Index (CDI), were introduced to quantify non-uniformities in the pressure distribution. The study reveals that while the addition of certain components, such as bellmouths, improved the flow uniformity and reduced distortion, their impact on acoustic output was less straightforward. Additionally, an obstruction study was conducted to evaluate the effect of partial blockage on fan performance and distortion. The results provide insights into the relationship between installation effects and fan efficiency, pressure rise, and noise production, supporting potential design optimizations for fan installations in industrial applications.