Actuator-disk models (ADMs) use blade element theory to numerically simulate the flow field induced by axial fans. These models give a fair approximation at near design flow rates, but are of poor accuracy at low flow rates. Therefore, the lift/drag (LD) characteristics of two-dimensional (2D) sections along the span of an air-cooled heat exchanger (ACHE) axial fan are numerically investigated, with the future prospect of improving ADMs at these flow conditions. It is found that the blade sectional LD characteristics are similar in shape, but offset from the 2D LD characteristics of the reference airfoil (NASA LS 413 profile) at small angles of attack (). A deviation between these characteristics is observed at higher angles of attack. The blade sectional lift coefficients for always remain lower compared to the maximum lift coefficient of the reference airfoil. Conversely, the blade sectional drag coefficients are always higher compared to that of the reference airfoil for .
Lift and Drag Characteristics of an Air-Cooled Heat Exchanger Axial Flow Fan
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received July 2, 2014; final manuscript received March 9, 2015; published online April 28, 2015. Assoc. Editor: Edward M. Bennett.
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Louw, F. G., von Backström, T. W., and van der Spuy, S. J. (August 1, 2015). "Lift and Drag Characteristics of an Air-Cooled Heat Exchanger Axial Flow Fan." ASME. J. Fluids Eng. August 2015; 137(8): 081101. https://doi.org/10.1115/1.4030165
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