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International Journal of Turbomachinery, Propulsion and Power, Volume 7, Issue 1
March 2022 - 11 articles
Cover Story: This paper presents an overview on worst-case design scenarios for which low-speed axial fans may exhibit an increased risk of blade resonance due to profile vortex shedding. To set up a design example, a representative blade profile is investigated in twofold approaches of blade mechanics and aerodynamics. For these purposes, the frequency of the first bending mode of the blade profile is expressed. Furthermore, an iterative blade design method is developed for checking the risky scenarios for which spanwise and spatially coherent shed vortices may occur. Coupling these two approaches, cases for vortex-induced blade resonance are set up. Opposing this basis, design guidelines are elaborated upon for avoiding such resonance and for moderating the annoyance due to the vortex shedding noise. View this paper
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Int. J. Turbomach. Propuls. Power - ISSN 2504-186X