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Abstract

The "Grand Paris Express" railway network is currently under construction. We know that piston effect created by train operated over 100 km/h (65 mph) through a succession of 1,000-2,000 m tunnels and stations will differ from the traditional Parisian metropolitan network. The piston effect created in front and behind the train will be reflected in the shafts positioned in the tunnels for the access of the emergency teams. The equipment in the shafts, especially the fans, will be subjected to strong variations in pressure. Therefore, they will be operated in areas that are not defined by the usual for fans.
In order to characterize a "Grand Paris Express" type machine, Eiffage carried out a test bench to test the behavior of a Ø1000 model fan that has the same aeraulical and mechanical characteristics of the 300 fans that will be installed in the service structures of this new network. The model fan has been first tested in the unexplored area of negative pressure and negative flowrate to define the behavior in the 2 other quadrants of the curve. It is now operated with successive negative and positive forced pressure on thousands of cycles to ensure the durability of the equipment on several years of operation.