The Study of Temperature Filed by High-speed Train Traveling Through a Long Tunnel

Aerodynamic effect induced by high-speed train moving in very long tunnel is significantly different from short tunnel. In this paper a simulation of high-speed train traveling through a deep buried long tunnel has been made. According to train and tunnel system, Navier-Stokes equation of three-dimensional flow is solved by finite volume method. An unsteady, compressible, turbulent calculation was carried out using a RNG k - epsilon turbulence model employing a second-order upwind discretization scheme. Based on the same blocking ratio and head shape, various speed conditions, pressure drag between train nose and train tail, friction drag on train body and the quantity of heat produced by the energy-consuming for working of train against all resistance are evaluated. The heating of train drag, train wall friction, auxiliary equipment, train equipment, train braking and pantograph electric arc etc. has also been comprehensively considered, and the energy loss of heat conduction introduced by tunnel wall has been taken into account. The temperature rising and variation with time in the tunnel is predicted.