Krömer F, Czwielong F, Becker S (2019)
Publication Language: English
Publication Type: Journal article, Original article
Publication year: 2019
URI: https://arc.aiaa.org/doi/abs/10.2514/1.J058134?journalCode=aiaaj
DOI: 10.2514/1.J058134
Axial fans represent a major source of noise in technical systems. Based on investigations on airfoils, a promising measure for reducing the sound emission of such systems with axial fans is the application of leading-edge serrations to the fan blade. Hence in this study, the joint impact of fan-blade skew—as a commonly used noise-reduction approach—and leading-edge serrations on the sound emission of low-speed axial fans was investigated. Forward-, backward-,and unskewed fans with five different leading-edge modifications were used. For each fan, a reference configuration with straight leading edges and four configurations with sinusoidal leading-edge serrations (with two different amplitude values and two different wavelength values) were examined. The results show that, among the reference fans with unmodified leading edges, the forward-skewed fan had the lowest sound emission. The serrations applied to the unskewed fan lead to an increase in the efficiency and a decrease in the sound emission. When applied in combination with fan-blade skew, the serrated fans showed an even lower sound emission and a higher efficiency— even the forward-skewed fan, which already has a low sound emission without any leading-edge modifications. The highest sound reduction was achieved by applying the serrations with the smallest wavelength and the highest amplitude. The findings prove that even for low-noise fans with forward-skewed fan blades, a further sound reduction is possible with the use of leading-edge serrations.
APA:
Krömer, F., Czwielong, F., & Becker, S. (2019). Experimental Investigation of the Sound Emission of Skewed Axial Fans with Leading-Edge Serrations. AIAA Journal. https://doi.org/10.2514/1.J058134
MLA:
Krömer, Florian, Felix Czwielong, and Stefan Becker. "Experimental Investigation of the Sound Emission of Skewed Axial Fans with Leading-Edge Serrations." AIAA Journal (2019).
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