Research on Design Method of External Coil of Electromagnetic Rail Launch Equivalent Test Platform

It is difficult to study the interaction mechanism between electromagnetic energy and metal materials directly in the electromagnetic rail launcher. Based on the existing test conditions, under the condition of tens of kiloamperes of current, the loading mode of long pulse current combined with external magnetic field is adopted, which is equivalent to the extreme environment of electromagnetic thermodynamic synthesis in the process of electromagnetic rail launching. In this paper, through theoretical calculation and ANSYS simulation, the magnetic field distribution of circular, rectangular, elliptic and straight slot coils are compared, and the influence of elliptic parameters on the magnetic field is emphatically analyzed. The ratio of long axis to short axis of ellipse when the magnetic field distribution is relatively uniform is obtained by simulated annealing algorithm. The conclusion shows that when the external coil is elliptic and the ratio of long axis to short axis is about 1.6, the magnetic field, current density and electromagnetic force on the metal sample can be equivalent to the electromagnetic rail launch condition.