Abstract: Installing windbreak along high-speed railway is an effective measure to enhance the safety of high speed train under cross-wind. The experiments were carried out on the high speed train dynamic model platform of the Institute of Mechanics,Chinese Academy of Sciences. The moving high speed train model with a scale ratio of 1:8 through the windbreak region with high speed. The different positions' fluctuating pressure of the windbreak caused by different train types and different train speeds were tested. The results show that:when the high-speed train passes through the windbreak region, it forms a positive-negative-negative-positive fluctuating pressure on the windbreak. The trend of the pressure wave at different height of the windbreak is similar, but the amplitude is different. The pressure coefficients at different speeds are almost equal. The maximum pressure value occurs at the train nose height. With the increase of train speed, the amplitude of the fluctuating pressure increases, the reversing time reduces, and the pressure gradient increases. With the different type of the train, the trend of pressure is similar, but the amplitude is different. The aerodynamic pressure of the blunt body head is larger than that of the bullet head. With the distance between the windbreak and the center line increasing, the pressure decreases gradually. The head crest reduces most obviously, and it's linear with distance.

Key words: high speed train, moving model, windbreak, fluctuating pressure