Tunnel Simulation Facility (TSG)
Model trains are accelerated by a hydro-pneumatic driven catapult to run on a model track at nearly constant speed through a tunnel or a field of cross-wind. The velocity of the model vehicle is adjusted by the hydraulic pressure. The maximum speed it 360 km/h. The track has a lenth of about 60 m, and the rail gauge is 57,5 mm. The cross wind is generated by a closed-loop wind tunnel which blows perpendicular to the track with a velocity of up to 90 km/h. The facility is designed for model scales between 1:20 and 1:100. The maximum weight of a model is 10 kg. The models are gently decelerated at the end of a track in a gravel bed like section filled with small plastic pellets. The complete facility is enclosed in an impact-resistant housing for safety reasons.
There are mainly two topics of interest. Firstly this is the generation of compression waves during tunnel entry and exit. For example special designs of tunnel portals and train-heads are tested with respect to their potential to reduce the compression waves. Such tests are done also for the validation of analytical and numerical models to compute the compression waves. Secondly the unsteady aerodynamic forces and loads, which act on a train when it suddenly encounters cross wind, are investigated. The situation of a train, which leaves a tunnel with high velocity and then enters directly a bridge with strong cross wind present, can be simulated. The studies are intended to improve the safety of rail traffic particularly because future rail vehicles will show more light-weight design to improve their energy efficiency.
Please fill out the following "Request for use of the tunnel simulation test facility". Leave fields blank which you cannot answer. Fields with bold print must be filled out. If you have any questions, you may contact the facility coordinator Stephanie Klein (phone: +49(0)551 709-2612).
Dr. Klaus Ehrenfried
German Aerospace Center (DLR)
Institute of Aerodynamics and Flow Technology, Department Fluid Systems
Phone: +49 551 709-2813