CROSS-VENTILATION OF UNDERGROUND RAILWAY TUNNELS
The aerodynamic merits and demerits of cross-ventilating adjacent tunnels in underground rapid transit systems are discussed. Three types of cross-ventilation are considered, namely (a) numerous small holes in the dividing wall between the tracks in a cut-and-cover tunnel, (b) a curtailed dividing wall, and (c) passages linking separately bored tunnels. It is shown that considerable reductions in the air velocities expected on station platforms will result if the end regions of the tunnels are well cross-ventilated. Additionally, useful reductions in the aerodynamic drag force on trains can be expected if cross-ventilation is provided along the whole length of the tunnel. However, this is recommended only for low-speed systems because interaction between passing trains will cause large pressure fluctuations at high speeds.
- For ASME Meeting held December 10-15, 1978.
American Society of Mechanical EngineersTwo Park Avenue
New York, NY United States 10016-5990
- VARDY, A E
- Publication Date: 1978
- Features: References;
- Pagination: 10 p.
- TRT Terms: Air; Drag; Flow; Railroad trains; Railroads; Rapid transit; Resistance (Mechanics); Subways; Tunnels; Ventilation systems
- Uncontrolled Terms: Air flow
- Old TRIS Terms: Cross ventilation; Train resistance
- Subject Areas: Bridges and other structures; Construction; Environment; Public Transportation; Railroads; Vehicles and Equipment;
- Accession Number: 00189007
- Record Type: Publication
- Source Agency: Engineering Index
- Report/Paper Numbers: n 78-WA/FE-14
- Files: TRIS
- Created Date: Apr 25 1981 12:00AM