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Improved Aerodynamics of a Hollow-Blade Axial Flow Fan by Controlling the Leakage Flow Rate by Air Injection at the Rotating Shroud

Abstract : Axial flow fans are used in many fields in order to ensure the mass and heat transferfrom air, chiefly in the heating, ventilation and air conditioning industry (HVAC). A more properunderstanding of the airflow behavior through the systems is necessary to manage and optimize thefan operation. Computational fluid dynamics (CFD) represents a real tool providing the ability toaccess flow structures in areas that measuring equipment cannot reach. Reducing the leakage flowrate, inherent in operation, by synthetic-jet techniques improves performance. This paper presents theCFD results performed on a hollow blade fan developed by our team. The leakage flow is controlledby blowing air from 16 designated circular holes and arranged on the fan shroud. We discuss theresults for two rotational speeds (1000and2000rpm) and two injection rates (400and800liters/min).The numerical results consistent with the experimental show, for the low rotation speed and highinjection ratio, significant gains in power (53%), torque (80%) and leakage flow rate (80%)
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https://hal.archives-ouvertes.fr/hal-03282305
Contributor : Florent Ravelet <>
Submitted on : Friday, July 9, 2021 - 9:39:30 AM
Last modification on : Saturday, July 17, 2021 - 3:21:27 AM

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Michaël Pereira, Florent Ravelet, Kamel Azzouz, Tarik Azzam, Hamid Oualli, et al.. Improved Aerodynamics of a Hollow-Blade Axial Flow Fan by Controlling the Leakage Flow Rate by Air Injection at the Rotating Shroud. Entropy, MDPI, 2021, 23, ⟨10.3390/e23070877⟩. ⟨hal-03282305⟩

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