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Anmeldungsdatum: 12.04.2022
Beitrge: 970
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 Verfasst am: 07. Jan 2023 08:12 Titel: Vortex High Performance Inline Duct Blower Fan 12" |
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Vortex High Performance Inline Duct Blower Fan 12"
Vortex in-line duct blower fans are ideal for use in general purpose exhaust applications. Vortex V-12XL in-line duct blower fans are made from quality steel and feature a hammertone powder coat finish for added durability. The fans are built with an extended collar and lip to allow easy duct hookup. Galvanized mounting brackets allow for horizontal or vertical installation. Aerodynamic build allows free air flow. Mixed flow impellers allow generous air volume. Fans feature a permanently lubricated, maintenance-free ball bearing motor. Low 1700 RPM operating speed enables quiet operation. V-12XL fans fit ducts measuring 12" in diameter. 6'L power cord included. ETL,CSA and UL507 listed. 3 Year Limited Warranty.Get more news about Vortex Centrifugal Fan,you can vist our website!
Volutes for radial-flow turbomachines (e.g., centrifugal fans and pumps) are spiral funnel-shaped casings that house rotors. Their function is to guide the flow from rotors to outlets and maintain constant flow speeds. Under specific conditions, however, volutes are removed (termed voluteless) to reduce flow losses and noise. In this paper, a generic voluteless centrifugal fan is investigated for the tonal noise generation at an off-design operation point. In contrast to typical tonal noise sources induced by the fan blades, we find out that another predominant source is the turbulence stemming from the clearance gap between the fan front shroud and the inlet duct. The turbulence evolves along with the front shroud and is swept downstream to interact with the top side of the blade leading edge. An obvious additional tone is observed at 273 Hz other than the blade passing frequency (BPF0) and relevant harmonic frequencies. By coarsening the mesh resolution near the inlet gap and front shroud in the simulations, we artificially deactivate the gap turbulence. Consequently, the tone at 273 Hz disappears completely. The finding indicates that the interaction between the gap turbulence and blades accounts for the tone. As the gap turbulence exists near the front shroud, this rotating wall introduces rotational momentum into the turbulence due to skin friction. Hence, this tonal interaction frequency is smaller than BPF0 with a decrement of the fan rotation frequency. To the authors' knowledge, this is the first time that voluteless centrifugal fans are studied for the gap-turbulence noise generation. |
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