THERMODYNAMIC INVESTIGATION INTO TUNNEL FIRES

THERMODYNAMISCHE UNTERSUCHUNG VON TUNNELBRAENDEN

THE FIRES EVALUATED IN THIS WORK WERE OF A STANDARD FORM EACH USING 200 L OF PETROL. FIVE CHARACTERISTIC VENTILATION TYPES WERE SELECTED AND FOR EACH OF THESE THERE WAS PREPARED A MASS BALANCE OF THE STOICHIOMETRIC SMOKE GASES, A CARBON MONOXIDE MASS BALANCE AND AN ENERGY BALANCE. THE FOLLOWING VENTILATION FORMS WERE CONSIDERED: (1) CROSS VENTILATION; (2) CROSS VENTILATION WITHOUT FRESH AIR INTAKE; (3) PARTIAL CROSS VENTILATION WITH UPPER AIR INJECTION; (4) ARTIFICIAL LONGITUDINAL FLOW; (5) WITHOUT VENTILATION. WITH CROSS VENTILATION IT WAS SHOWN THAT IT IS POSSIBLE TO CONTAIN A LARGE PART OF THE RESULTING SMOKE GASES IN THE VICINITY OF THE STOVE AND DISPATCH THEM FROM THE TRAFFIC SPACE. THE PARTIAL CROSS VENTILATION WITH FULL UPPER AIR INJECTION PROVIDED THE MOST UNFAVOURABLE MASS DIVISION OF STOICHIOMETRIC SMOKE GASES WITHIN THE TRAFFIC SPACE (INDIRECT LONGITUDINAL VENTILATION, TURBULENCE OF THE SMOKE GASES). ARTIFICIAL LONGITUDINAL VENTILATION PROVIDED FAVOURABLE CONDITIONS ON THE UPSTREAM SIDE OF THE FIRE, WHILST ON THE DOWNSTREAM SIDE THERE OCCURRED A FAST MOVEMENT AND TURBULENCE OF THE SMOKE. WITHOUT VENTILATION THERE ARE REASONABLY MORE FAVOURABLE CONDITIONS DURING THE EARLY PHASE OF THE FIRE COMPARED TO THAT WITH PARTIAL CROSS VENTILATION AND WITH ARTIFICIAL LONGITUDINAL VENTILATION. IN THE LATTER PHASES THE CONDITIONS ARE LESS FAVOURABLE, BECAUSE THE SMOKE GASES MOVE VERY SLOWLY OUT OF THE TUNNEL.

  • Corporate Authors:

    TECHN. UNIV. GRAZ

    RECHBAUERSTRASSE 12
    GRAZ,   Austria  A-8010
  • Authors:
    • Schweiger, H
  • Publication Date: 1976

Language

  • German

Media Info

  • Pagination: 115P

Subject/Index Terms

Filing Info

  • Accession Number: 01301963
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD
  • Created Date: Nov 21 2010 8:27AM