Yong-Jun Jang/Hag-Beom Kim/Woo-Sung Jung/Dong-Hyeon Kim
International Journal of Railway, vol. 2, no. 2, pp.93-97, 2009

Abstract : The experiments for aerodynamic characteristics of railway acoustic screen are performed using 1/61 scaled-down moving model rig facility which employs an axis symmetry and one wire guidance method. The launching mechanism is an air-gun type. The train model for the experiment is the high speed train (Korea Train Express: KTX) and the tested speed is about 300 km/h. The tested train length is 61 cm which is corresponding to two units of KTX train. The cross sectional area and weight of train model are 0.00264 m2 and 287 g, respectively. The Reynolds number based on the model train length is 1.2×107. The strength of pressure wave is measured using piezo typed pressure sensor. The measured pick value of pressure was as high as 365 Pa in the shortest gap between the acoustic screen and model train. The measured pressure is well compared with the field test data of UIC 779-1[2] values. However, the experimental data were slightly lower than the UIC 779-1 values. The results show the model test can be used as a substitute for the field test.

Keyword : High-speed train, Acoustic screen, Moving-model rig, Pressure characteristics