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Design, Simulation, Performance Analysis, Optimization, Fabrication and Experimental Test of a Large Scale Reversible Axial Flow Fan

Abdolmaleki, Mohammad | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50505 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan; Afshin, Hossein
  7. Abstract:
  8. During fires, smoke particles are emitted in the air and the oxygen content of it rapidly drops. In order to tackle these two challenges which are among the main human life threatening factors, there is a need for a proper ventilation system. Ventilation is also one of the most sensitive and vital technical aspects in construction of tunnels and mines. Ventilation fans are tasked with two main objectives which are diluting the air inside the tunnel, parking, etc. and the timely discharge of smoke in case of fire. Hence, they should have similar operation in suctioning and discharge and supply the required flow rate in both directions. This is the reason the fans are reversible. Reversible fans should necessarily have symmetric blade profiles (s-shaped or elliptical). By reversing the rotation, the leading edge turns into the trailing edge and the flow direction changes without any reduction in efficiency. Since in all design methods, different sections are designed in two dimensions, final results are not consistent with the 3D simulations which is known as deviation from design. In this, study, first the elliptical cascade profile is carefully analyzed for various angles of attack, velocities and Solidities and lift and drag forces are accordingly calculated. Next, in order to reach an accurate 3D design, the script method was used and several coding softwares were coupled to lead to a purposeful design with the minimum deviation from design. In the next stage, after ensuring the simulation and prediction of performance curve, the fabricated fan in the 1:1 scale was tested and analyzed according to AMCA 210 standards. It was seen that the results were in acceptable agreement with simulation data. Therefore, the current study has two important outcomes; first, this simulation method can evaluate any blade (even those made by other companies) before fabrication or montage, enabling the accurate prediction of performance curves and obviating the fabrication and test costs which are important for fan manufacturers. In addition, by using the results of this study, any fan with any required parameter, with design confidence and correct prediction of its performance curve can be manufactured
  9. Keywords:
  10. Reversible Axial Flow Fan ; Elliptical Profile ; Rigidity ; Cascade Airfoil ; AMCA210 Standard ; Coupling Software

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