Experimental results on vehicle-tunnel interactions during the entering period of the vehicle include measurements of pressure on the tunnel and on the vehicle itself. The measurements were made for various Mach number conditions, vehicle-head shapes, tunnel positions, and for various positions on the surface of the vehicle. These results are of direct interest and use in the design of a vehicle. The direct implication of the pressure state during entry is that for Mach numbers presently contemplated (equivalent to 300+ mph) all ports must be sealed as the train enters the tunnel. The differential pressure level and the rates of change of pressure to be sealed against can be found from the information given in the report.
Vehicle-Tunnel Entry at Subsonic Speeds
1973
67 pages
Report
No indication
English
Metropolitan Rail Transportation , Vehicular tunnels , Fluid dynamics , Passenger vehicles , Interactions , Subsonic characteristics , Model tests , Fluorohydrocarbons , Tubes , Differential pressure , Human factors engineering , Simulation , Cylindrical bodies , Oscillographs , Acoustic velocity , Vehicle tunnel entry
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