基于先导放电理论的直升机初始雷击附着位置北大核心CSCD

提出了一种基于流注-先导放电理论的数值模拟方法来快速判断直升机初始雷击附着点。首先,根据标准SAE-ARP 5416A中规定的相关试验方法,确定平板电极大小、直升机离边界距离等参数。然后,利用Becerra-Cooray正极性先导起始和发展判据对UH-60"黑鹰"直升机的主旋翼翼尖、尾旋翼翼尖、水平尾翼以及机头部位进行分析比较。最后,通过不断改变平板电极电势的方法,找到各个关键位置产生稳定正极性先导所需的最小背景电场值,以此为依据来对其初始雷击附着位置进行分析。结果表明,主旋翼翼尖最易成为初始雷击附着位置,而机头则较难成为初始雷击附着位置。

Numerical simulation of initial lightning attachment points on helicopter based on stream-leader discharge theory

The first step to the design of aircrafts is to determinate the initial lightning attachment points. In this paper, a fast numerical simulation method based on the stream-leader discharge theory is presented to simulate the initial lighting attachment point on the helicopter. Firstly, the size of the electrode, the distance between the helicopter and the boundary and other parameters are determined according to the test methods of the lightning attachment points in the SAE-ARP 5416A standard. Then, upward leader inception based on Beccera-Cooray criterion is used to analyze the tip of the main rotor and tail rotor , the head, and the horizontal tail of the UH-60 helicopter. Finally, finding the minimum electric field sustains the positive leader inception by continuously changing the potential of the electrode, which can provide basis to the analysis of the initial lightning attachment points. The simulation results show that the main rotor is most likely to be the lightning initial attachment point and the head is hard to be the lightning initial attachment point.