High Reynolds number wind tunnel experiments on trains

Various new types of trains were investigated in a wind tunnel at relatively high Reynolds numbers. The testing involved large-scale models in combination with high wind speeds. Local pressures, local temperatures and overall forces and moments were measured. This paper discusses the various relevant parameters from the perspective of wind tunnel testing. Further, some test results and the economic benefits of drag reduction are discussed. Some data points concerning drag and local pressure were available from full-scale testing; unlike the pressure values, the drag values compared fairly well.