Rail consultancy
Upside down…
SNCF and ALSTOM Transport have become loyal clients today. Some of the most recent studies scheduled include those conducted in the Jules Verne wind tunnel. Accordingly, in 2007, CSTB worked on a life-size scale, on the bottom of the train bodies. Jean-Paul Bouchet explains, “TGVs (high-speed trains) are getting faster and faster and generate, through speed, extremely dynamic flows near the train. In other words: the ballast might take off.” A safety issue: the organs on the bottom of the train body might be damaged. “This is not really a problem for current travel speeds, but if we want our TGVs to reach 400 km/h within the next ten years, well, then, yes, we need to start worrying about it right now!”
From life-size scale to 1:15th
Wind tunnel studies, numerical or on-site studies: all of the players in the railway industry are now very familiar with CSTB’s offer. The current drafting of EN 14067 standard on railway aerodynamics issues, a standard to which the French SNCF and ALSTOM Transport are contributing, is proof of this. Among other things, it determines the methods for ruling on rolling stock compliance in terms of TSIs (Technical Specifications for the Interoperability of the European rail system). Pierre Palier explains, “This is a European standardization norm between the different countries. One of the objectives is that reduced-scale tests conducted in our continent’s different laboratories be done in the same conditions and that in the end, the protocol be the same everywhere and the relevance of the results be guaranteed.” Pierre Palier and Jean-Paul Bouchet express a certain amount of pride: “The measurements carried out at CSTB will be part of the baseline data for the standardization part in terms of the effects of cross winds on railway vehicles…”