Pressure Characteristics on Korean High-Speed Railway Acoustic Screen Using 1/61 Scaled-Down Moving Model Rig

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 ㎞/h. The tested train length is 61 ㎝ which is corresponding to two units of KTX train. The cross sectional area and weight of train model are 0.00264 ㎡ and 287 g, respectively. The Reynolds number based on the model train length is 1.2×10?. The strength of pressure wave is measured using piezo typed pressure sensor. The measured pick value of pressure was as high as 365 ㎩ 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.