In recent years, a trend towards modifications of the leading edge geometry in airfoils to reduce the sound emission andimprove the stall behavior has been observed. However, low-pressure axial fan design methodologies for a decreasedsound radiation rely almost exclusively on the use of fan blade skew rather than on leading edge modifications so far.Therefore, with this study we aim to investigate the sound reduction capabilities of leading edge serrations applied tolow-pressure axial fans using the efficient perturbed convective wave equation. For this purpose, we use a referencefan with straight leading edges and a fan with serrated leading edges that has been studied in experimental investiga-tions before. The comparison of the CFD and CAA simulations with experimental results show excellent agreement.Furthermore, we analyze the sound reduction mechanisms of leading edge serrations based on the CAA results. Ingeneral, a sound reduction is obtained with leading edge serrations without influencing the fan operating point. Thestudy demonstrates the applicability of this aeroacoustic approach for axial fans with modified leading edges.
|Title of host publication||Proceedings of the ICA 2019 and EAA Euroregio|
|Subtitle of host publication||23rd International Congress on Acoustics, integrating 4th EAA Euroregio 2019 |
|Number of pages||7|
|Publication status||Published - 2018|
|Name||Proceedings of the ICA|