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Performance analysis of elliptic-profile airfoil cascade for designing reversible axial flow fans

Abdolmaleki, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.2514/1.J057843
  3. Publisher: American Institute of Aeronautics and Astronautics Inc , 2019
  4. Abstract:
  5. Because reversible fans must be able to provide similar performance in either rotation direction, they need to have completely symmetrical blades. In the present study, an elliptic profile with itsmaximum thickness of 8%chord length at themiddle of the chord line is studied. For verification, theNACA0012 airfoilwas once analyzed two-dimensionally in the isolatedformationandonce in cascade formation with0.55 and 0.83 solidities, andthe obtainedresultswere comparedwith numerical and experimental results. Three well-known Reynolds-averaged Navier-Stokes turbulence models including Spalart-Allmaras, realizable κ-ϵ, and shear-stress transport κ-ω were used to find the suitable turbulence method. After making sure of the accuracy of the modeling procedure, lift and drag coefficients were calculated for the elliptic profile for a wide range of velocities, solidities, andangles of attack.Anumber of issues not previously addressed indetail by previous works, such as the important stall phenomenon at low solidities, were solved, and the obtained aerodynamic coefficients were corrected by considering the occurrence of the stall. Finally, themethod of using the colored cube for the design procedure of these blades was also proposed to reduce the gap between the design and the desired outcome. © 2018 by the American Institute of Aeronautics and Astronautics, Inc
  6. Keywords:
  7. Aerodynamic drag ; Aerodynamic stalling ; Axial flow ; Navier Stokes equations ; Shear stress ; Turbulence models ; Aerodynamic coefficients ; Elliptic profile ; Lift and drag coefficients ; Modeling procedure ; Performance analysis ; Reynolds - Averaged Navier-Stokes ; Rotation directions ; Shear-stress transport ; Design
  8. Source: AIAA Journal ; Volume 57, Issue 4 , 2019 , Pages 1492-1501 ; 00011452 (ISSN)
  9. URL: https://arc.aiaa.org/doi/abs/10.2514/1.J057843?journalCode=aiaaj