Aerodynamic performance and streamlined head shape of train

Research methods such as numerical simulation, moving model test, wind tunnel test, full-scale train test and theoretical analysis and so on have been adopted. And the influence of streamlined head shape on air pressure pulse from two trains passing by each other, aerodynamic drag and lift was deeply studied, and a series of theory functions obtained. The research results show that: (1) As the length of streamlined train head increases, the aerodynamic performance will be effectively improved. Air pressure pulse amplitude reduces in proportion of logarithm while the absolute value of the aerodynamic drag and lift of head-car will linearly decrease and the aerodynamic drag of the tail-car will decrease by square. (2) When the largest outline of head longitudinal section becomes from concave to convex, air pressure pulse, aerodynamic drag and lift have little change. Decreasing the radius of transitional curve on the train nose will effectively reduce the amplitude of air pressure pulse. (3) When the largest outline on plan form of head is square, air pressure pulse is minimum. While head-car is cuspidate shuttle shape, the absolute value of aerodynamic drag and lift is less. (4) The aerodynamic shape design of train head should consider all kinds of factors because the relation between reducing aerodynamic drag and air pressure pulse may be conflictive and uniform.