基于流固热耦合模型的并行电弧损伤影响分析

Parallel Arc Damage Analysis Based on Fluid-Solid Thermal Coupled Model

电弧故障可以释放很高的能量,对周围一定距离的物体和导线造成危害,其产生的热量甚至可以引起火灾。首先,理论分析电弧的能量在管路上的分配及其造成的影响,使用流固热耦合的数值计算方法,用于模拟流体和固体之间的实时热量交换。建立了有限元模型,对电弧损伤影响进行数值仿真研究,建立了电弧能量分配方程。最后,分析了直流28V和交流115V供电条件下的电弧损伤影响程度,验证了所建立的电弧能量分配方程的预测能力。仿真结果表明:电弧故障使得金属发生相变,其损伤影响程度与电弧功率系数、能量耗散因数等有关;当电弧功率增大后,管路相变吸收的能量所占电弧总能量的比重就越大;电弧功率系数是一个与管路和电弧位置间距有关的指数函数。

The arc fault can release high energy,which poses great harm to surrounding objects and wires within a certain distance,and the generated heat can even cause a fire.First of all,the arc energy distribution and its damage to the pipe are analyzed in theory,and the real-time heat exchange between fluid and solid is simulated by the fluid-solid thermal coupled method.Finite element model is obtained,the arc damage is numerically simulated and the equation of arc energy distribution is obtained.The arc damage under the source voltage of DC28 Vand AC115Vis studied and the prediction capability of the equation is verified.The simulation results show that：The arc fault can make the metal have phase transformation;The arc damage has a close relationship with the heat dissipation factor and the fraction of arc power,et al;When the arc power increases,the ratio of the energy used for phase transformation to the arc energy increases;The fraction of arc power is an exponential function related to the distance between the arc and the pipe.