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Eccentricity effects on jet fan performance in longitudinally ventilated rectangular tunnels

Tabarra, M. / Bennett, E.C. / Matthews, R.D. / Armstrong, J. / Smith, T.W.

Some results of an SERC/DTI-funded LINK scheme to investigate the aerodynamic characteristics of road tunnels ventilated longitudinally by jet fans are presented. The paper shows the effect of proximity of a fan to a wall on the ability of the fan to induce a ventilation airflow in a typical rectangular tunnel. Two modes of proximity are considered: the fan in the middle of the ceiling and in one corner. The jet plume clings to the surface, raising the local wall shear stress which reduces the amount of jet momentum available to induce a ventilation flow. Results from experiments and computational studies are combined in a calculation method to estimate the wall proximity effects on installation efficiency.

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Eccentricity effects on jet fan performance in longitudinally ventilated rectangular tunnels

Tabarra, M. / Bennett, E.C. / Matthews, R.D. / Armstrong, J. / Smith, T.W.

Some results of an SERC/DTI-funded LINK scheme to investigate the aerodynamic characteristics of road tunnels ventilated longitudinally by jet fans are presented. The paper shows the effect of proximity of a fan to a wall on the ability of the fan to induce a ventilation airflow in a typical rectangular tunnel. Two modes of proximity are considered: the fan in the middle of the ceiling and in one corner. The jet plume clings to the surface, raising the local wall shear stress which reduces the amount of jet momentum available to induce a ventilation flow. Results from experiments and computational studies are combined in a calculation method to estimate the wall proximity effects on installation efficiency.

Eccentricity effects on jet fan performance in longitudinally ventilated rectangular tunnels

Tabarra, M. / Bennett, E.C. / Matthews, R.D. / Armstrong, J. / Smith, T.W.

Some results of an SERC/DTI-funded LINK scheme to investigate the aerodynamic characteristics of road tunnels ventilated longitudinally by jet fans are presented. The paper shows the effect of proximity of a fan to a wall on the ability of the fan to induce a ventilation airflow in a typical rectangular tunnel. Two modes of proximity are considered: the fan in the middle of the ceiling and in one corner. The jet plume clings to the surface, raising the local wall shear stress which reduces the amount of jet momentum available to induce a ventilation flow. Results from experiments and computational studies are combined in a calculation method to estimate the wall proximity effects on installation efficiency.

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Title:

Eccentricity effects on jet fan performance in longitudinally ventilated rectangular tunnels

Additional title:

Einfluss der Exzentrizitaet auf die Leistung eines Strahlgebläses in laengs beluefteten rechteckigen Tunnel

Contributors:

Tabarra, M. (author) / Bennett, E.C. (author) / Matthews, R.D. (author) / Armstrong, J. (author) / Smith, T.W. (author)

Published in:

Seminar organized by the Fluid Machinery Committee of the Institution of Mechanical Engineers, Fans for Hazardous Applications, 1994/06 ; 11-16

IMechE Seminar Publication ; 1994-6

Publication date:

1994

Size:

6 Seiten, 8 Bilder, 1 Tabelle, 7 Quellen

ISBN:

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Tunnel , Kanal (Hohlleitung) , Ventilationsverlust , Axiallüfter , Anordnung (räumlich) , volumetrischer Wirkungsgrad , Axialströmung , Kanalströmung , Scherströmung , Wandströmung , Coanda-Effekt , Luftströmung , Lüftungsanlage , Förderleistung , Experiment , Simulationsprogramm , Rechnersimulation

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