Study on the Molten Pool on Steel Rail Surfaces due to Electric Arc Thermal Erosion inside High-Speed Railway Stations
In order to investigate the erosion effect of high temperature arc on rail material when the train passes through the mechanical insulation section in high-speed railway stations,based on the magnetohydrodynamic theory,coupled with the interaction of electromagnetic field,flow field and thermal field,and based on the establishment of the arc model and the molten pool model on the rail surface,the heat flow density on the rail surface and the width,depth and area of the molten pool under the different arc currents and the frequency of occurrence are calculated,and the effects of arc current and frequency on the erosion of rail are analyzed.The results show that:the heat flow density on the rail surface under the action of arc heat field is Gaussian distribution,and the peak value can be up to 220 MW·m-2;when the arc current is more than 100 A,the single action of the arc can form a molten pool on the surface of the rail;with the increase of the arc current and the frequency of its occurrence,the width and depth of the molten pool will increase,and the arc current mainly influences the development of molten pool of the rail along the radial direction;the frequency of the occurrence of arc current mainly influences the development of molten pool of the rail along the axial direction.When the traction grade is more than 5 or the frequency of arc occurrence is not less than 4 times,rail surface will be damaged.By controlling the traction level not more than 5 or reducing the frequency of arc occurrence when the train starts,the erosion of arc on the rail can be reduced to a certain extent.
Rail erosionInside high-speed railway stationsArcCurrentMolten poolMagnetohydrodynamicsMulti physics field
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维普
