Table of Contents Author Guidelines Submit a Manuscript
Advances in Acoustics and Vibration
Volume 2012, Article ID 562309, 11 pages
http://dx.doi.org/10.1155/2012/562309
Research Article

The Conceptual Design of High Pressure Reversible Axial Tunnel Ventilation Fans

Fläkt Woods Limited, Axial Way, Colchester, Essex CO4 5ZD, UK

Received 22 September 2012; Accepted 12 November 2012

Academic Editor: Joseph C. S. Lai

Copyright © 2012 A. G. Sheard and K. Daneshkhah. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tunnel ventilation fans, classically, must have the ability to both supply and extract air from a tunnel system, with the operator's choice dependent on the tunnel ventilation system's operating mode most appropriate at any given point in time. Consequently, tunnel ventilation fans must incorporate a reversible aerodynamic design which limits the maximum fan pressure rise. This paper presents three high pressure reversible fan concepts. These comprise a two-stage counter rotating fan, a single-stage high speed fan, and a two-stage fan with a single motor and impeller on each end of the motor shaft. The authors consider the relative merits of each concept. The third concept offers the most compact fan, transform, silencer, and damper package size. The authors discuss the mechanical design challenges that occur with a two-stage fan with a single motor and impeller on each end of the motor shaft. They present and consider a selected motor bearing arrangement and casing design for maintainability. Finally, the authors present both prototype fan and full-scale package aerodynamic and acoustic performance, before discussing the challenges presented by high temperature certification in accordance with the requirements of EN 12101-3: 2012.