To address the aerodynamic problems of new generation high speed trains, force measurement and PIV tests were performed on a high speed train model in the Cryogenic Wind Tunnel Cologne (DNW-KKK) at high Reynolds numbers. The Cryogenic Wind Tunnel Cologne is a low speed wind tunnel. By cooling the test gas down to 100K the Reynolds number can be raised by a factor of 5.5. The train model is connected to the support via girth gears, isolation plates, balance and angle of attack drive. A separate splitter plate is used to reduce the influence of the tunnel boundary layer. Test results showed that the repeatability of the force measuring system in DNW-KKK is high both at ambient and cryogenic operational mode. A PIV setup was used to investigate the vortex formed at the lee side of the train. The laser light sheet can be adjusted by means of a movable mirror and traversing equipment, so that the vortices at different sections and different yawing angles of the model can be measured. The PIV camera is located in a heated box and can be focused remotely. With these steps the PIV measurement can be performed down to 100K.
Road Vehicle Testing at High Reynolds Numbers in the Cryogenic Wind Tunnel Cologne DNW-KKK
2005-01-01
5503756 byte
Conference paper
Electronic Resource
English
11-1 Road Vehicle Testing at High Reynolds Numbers in the Cryogenic Wind Tunnel Cologne DNW-KKK
British Library Conference Proceedings | 2005
|Advancement of 2d Profile Testing at high Reynolds Number in the Cryogenic Wind Tunnel Cologne
British Library Conference Proceedings | 2003
|