Abstract

BEKKER, G. M.; MEYER, C. J.  and  VAN DER SPUY, S. J.. Numerical Investigation of Pressure Recovery for an Induced Draught Fan Arrangement. R&D j. (Matieland, Online) [online]. 2020, vol.36, pp.19-28. ISSN 2309-8988.  http://dx.doi.org/10.17159/2309-8988/2020/v36a3.

This study investigates the potential gain in operating volume flow rate and static efficiency for an induced draught fan arrangement by reducing the outlet kinetic energy loss. The reduction is achieved through pressure recovery, which is the conversion of dynamic pressure into static pressure. Downstream diffusers, stator blade rows, or a combination of these can recover pressure. Six different discharge configurations are tested for a fan. An annular diffuser with equiangular walls at an angle of 22° from the axial direction and a length equal to the fan diameter recovers the most pressure over a range of volume flow rates. The diffuser causes the operating volume flow rate and static efficiency to increase by 6.3 % (relative) and 20 % (absolute), respectively, compared to the initial design point of the particular fan.

Keywords : Pressure recovery; induced draught; diffuser; stator; axial flow fan.

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