Översikt
- Datum:Startar 23 januari 2026, 13:15Slutar 23 januari 2026, 17:00
- Plats:lecture hall HA3, Hörsalsvägen 4, Chalmers
- Opponent:Prof. Stefan Becker, Department of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany.
- AvhandlingLäs avhandlingen (Öppnas i ny flik)
Low-pressure axial fans are employed in a wide range of applications, from industrial systems to domestic appliances. Their operation in proximity to
humans necessitates the mitigation of noise emissions to prevent adverse health effects and promote comfort. The acoustic characteristics of these fans are influenced by installation effects, considered here in terms of inlet geometry, upstream obstructions, parallel fan operation, and the acoustic field of the test environment. Installation effects associated with the fan’s local flow field modify the underlying aeroacoustic source processes, while the test environment influences sound propagation. Furthermore, the assessment of installation effects must consider human perception of noise.
In this work, installation effects on the acoustics of low-pressure axial fans are investigated experimentally. A round robin test of a benchmark fan is
first conducted to evaluate both the aerodynamic and acoustic measurement capabilities of a bespoke fan performance facility. In addition, the influence of room-acoustical effects is examined, along with the estimation of sound power and directivity using a spherical harmonics scheme of the half-space.
A series of case studies on a low-pressure axial fan with rotating ring, investigates the effects of inlet geometry, upstream obstructions, and spacing in parallel fan operation on the system’s acoustic performance. Psychoacoustic metrics are also evaluated with respect to the installation conditions.
Finally, seven 3D-printed fans are employed to investigate the influence of blade loading distribution and hub-to-tip ratio on aeroacoustic performance.
The interaction between the examined rotor design parameters and installation effects, in particular inlet geometry and upstream obstructions, is also studied.
This work advances the understanding of installation effects on the acoustics of low-pressure axial fans, considering the aspects of source, environment, and receiver. The findings provide guidance for the evaluation and abatement of noise emissions from installations of low-pressure axial fans.
humans necessitates the mitigation of noise emissions to prevent adverse health effects and promote comfort. The acoustic characteristics of these fans are influenced by installation effects, considered here in terms of inlet geometry, upstream obstructions, parallel fan operation, and the acoustic field of the test environment. Installation effects associated with the fan’s local flow field modify the underlying aeroacoustic source processes, while the test environment influences sound propagation. Furthermore, the assessment of installation effects must consider human perception of noise.
In this work, installation effects on the acoustics of low-pressure axial fans are investigated experimentally. A round robin test of a benchmark fan is
first conducted to evaluate both the aerodynamic and acoustic measurement capabilities of a bespoke fan performance facility. In addition, the influence of room-acoustical effects is examined, along with the estimation of sound power and directivity using a spherical harmonics scheme of the half-space.
A series of case studies on a low-pressure axial fan with rotating ring, investigates the effects of inlet geometry, upstream obstructions, and spacing in parallel fan operation on the system’s acoustic performance. Psychoacoustic metrics are also evaluated with respect to the installation conditions.
Finally, seven 3D-printed fans are employed to investigate the influence of blade loading distribution and hub-to-tip ratio on aeroacoustic performance.
The interaction between the examined rotor design parameters and installation effects, in particular inlet geometry and upstream obstructions, is also studied.
This work advances the understanding of installation effects on the acoustics of low-pressure axial fans, considering the aspects of source, environment, and receiver. The findings provide guidance for the evaluation and abatement of noise emissions from installations of low-pressure axial fans.