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Aerodynamic Brake Essay

1067 Words5 Pages

The aerodynamic braking is a clean and non-adhesion braking system, and can be used to provide extra braking force for high-speed trains. Unlike the wheel disc brake and sliding frictional shoe brake, the aerodynamic brake is a system which does not make use of mechanical friction as braking force, and designed to generate braking force by increasing aerodynamic drag force with a panel unfolded on the top of the car. The qualities of this system are high reliability and reduced maintenance cost, because there is no wearing of components and heating due to friction. As a new high-speed train braking mode which involves no pollution and is good to the environment, there is great possibility that the aerodynamic brake system becomes an important …show more content…

The brake that is in open position blocks the air stream and causes the over pressure appearances in front of and under-pressure behind of braking panel. Pressure difference between in front and behind panel creates the drag force normal to the panel surface. The tangential force, the component caused by surface friction is negligibly small in comparison to normal force. Since aerodynamic drag increases in proportion of the square of the velocity, this system exhibits an excellent per-formance especially in high velocity ranges. Therefore, the aerodynamic brake may be classified as the high velocity range brake. The researches on aerodynamic braking and its related issues have attracted more and more attentions in recent years. Figures 1 to 3 show examples of aerodynamic braking in different trains and some works down in this con-cern are as follow. The aerodynamic brake influence, mounted on the high-speed train’s roof is studied on the flow field and overall braking force by Puharic et al. (2014). In their study drag force was obtained for speeds of 30, 50 and 70 m/s. Also drag force has been calculated for the second and third panels that determined the effect of interference

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