电磁轨道炮轨道温度场与热应力数值仿真

在电磁轨道炮发射过程中,因热量累积而引起的急速温升与热应力对轨道性能和寿命有着重要的影响。为获得发射过程中轨道温度场及热应力分布情况,在分析轨道热载荷的基础上,建立了热载荷计算模型,并在给定的参数下,利用有限元仿真软件ANSYS Workbench对3种典型截面轨道的温度场与热应力进行了数值仿真。仿真结果表明:轨道温度场与热应力轴向上呈梯度分布,纵向上只扩散到内表面很薄的区域,温度与热应力最大值在电枢初始位置处;相较于矩形与凹形截面轨道,凸形截面轨道温升与热应力较低,性能较好。

Numerical Simulation of Temperature Field and Thermal Stress in Electromagnetic Railgun

In the process of launching an electromagnetic railgun, the rapid temperature rise caused by heat accumulation is an important factor affecting the performance and life of the rail. On the basis of analyzing the source of the heat,the thermal load calculation model is established. Under the given parameters,the temperature field and thermal stress of the three typical sections of the rail are simulated by using the finite element simulation software ANSYS Workbench. The simulation results show that the temperature field and the thermal stress of the rail is graded distribution in the axial direction and spread to a thin surface layer of rail in the longitudinal direction,the maximum value is at the initial position of the armature. Compared to rectangular and concave cross section rail,convex cross section rail has lower temperature rise and thermal stress and performance better.