Determination the Performance Instability Range and Analysis of the Effect of Blade Tip and Hub Vortices in a Reversible Axial Flow Fan

Document Type : Original Article

Authors

1 PhD student, Guilan University, Rasht, Iran

2 Professor, Guilan University, Rasht, Iran

3 Associate Professor, Guilan University, Rasht, Iran

Abstract

The main goal of the present study is to determine the stable and unstable performance limits of a reversible axial flow fan by 3D numerical simulation. Reversible axial fans are a special type of axial fans that have the ability to create air flow in both directions by using a symmetrical blade profile in them. The main use of these fans is to discharge smoke and polluted air from channels and highway tunnels in emergency situations such as fire and also in normal operating conditions. In the present study, a reversible axial flow fan has been simulated three dimensionally.The qualitative results obtained from the numerical simulation indicate the presence of instability and the creation of vortices in areas such as the tip of the blade (flow leakage from the pressure surface to the suction in the gap distance of the tip of the blade) and also on the trailing edge and the suction surface of the blades (flow separation) in lower volume flows  from 26 (m3/s) and entering the fan in the stall area. The study of aerodynamic parameters and performance curves shows that the best performance range of the fan at a rotational speed of 900 rpm, is in the volume flow range of more than 26 (m3/s).

Keywords

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https://creativecommons.org/licenses/by/4.0/

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History

  • Receive Date: 23 October 2023
  • Revise Date: 19 January 2024
  • Accept Date: 02 February 2024
  • Publish Date: 19 February 2024

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