基于电流丝法的多级同步感应线圈炮电枢温升计算

针对同步感应线圈炮常用的导体圆筒式电枢,结合电流丝法,建立了电枢温升计算模型;通过搭建三级同步感应线圈炮试验平台,验证了计算模型的正确性,并分析了电枢材料和剖分设置对电枢温升计算的影响。结果表明:发射过程中电枢的最高温升位于其底部外侧,电枢前端也有较高温升;当调节载荷使铜、铝电枢等质量时,前者的温升虽然更高,但温升对其发射效率的影响却小于后者,这是因为铜的电阻率温度系数小于铝;电枢的剖分设置对电枢温升的计算的影响比较明显。因此从电枢温升对发射过程的影响来看,铜电枢比铝电枢更适合用于高速发射。

Calculation of temperature rise of armature in multi-stage synchronous inductive coilgun based on current filament method

The conductor cylinder armature is commonly used in synchronous induction coilgun. A model is developed to calculate the temperature rise of the armature based on the current filament method. The correctness of the model is verified by setting up a 3-stage synchronous induction coilgun test platform. The influence of the armature material and division setting on the temperature rise is analyzed. The result shows that the maximum temperature rise of the armature concentrates in the exterior surface of the tail, and there is a high temperature rise in the front of the armature. When the payload is adjusted to make the quality of the copper armature and the aluminum armature equal, the temperature rise of the former is higher while the influence of the temperature rise on its emission efficiency is lesser than the latter, because the temperature coefficient of resistivity of copper is less than that of aluminum. In addition, the influence of division setting on the calculation results is obvious. From the point of view of influence of the temperature rise on the emission process, the copper armature is more suitable for high-speed emission than aluminum armature.