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International Journal of Turbomachinery, Propulsion and Power
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International Journal of Turbomachinery, Propulsion and Power, Volume 7, Issue 4

2022 December - 12 articles

Cover Story: For backward curved centrifugal fans, increased low-frequency noise emissions together with a reduction in efficiency can be observed at partial loads. The spectral content of emerging noise emissions can be characterized by a subharmonic hump with several harmonics. Based on narrow-band acoustic measurements and numerical Lattice–Boltzmann simulations, deeper insight has been obtained, helping us to more effectively understand the underlying source mechanisms. Downstream from impeller blades, unsteady flow patterns have been identified to play a central role in this performance deterioration. Using a modal analysis of rotating flow patterns, the frequency content of subharmonic noise can be explained. Furthermore, a geometrical flow stabilization means was investigated, which permitted undesired flow behavior and noise emissions to be overcome. View this paper
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Int. J. Turbomach. Propuls. Power - ISSN 2504-186X
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