Numerical inversion analysis on front-face temperature rise of Al alloy suffered from long continuing current in lightning

作者：Liu, Yakun^*; Fu, Zhengcai; Liu, Quanzhen; Liu, Baoquan; Xia, Hailiang

来源：IET Science Measurement & Technology, 2018, 12(4): 467-471.

DOI：10.1049/iet-smt.2017.0222

• lightning
• aluminium alloys
• temperature measurement
• finite element analysis
• heat conduction
• finite difference methods
• time-domain analysis
• approximation theory
• numerical inversion analysis
• front-face temperature rise measurement
• lightning
• high-energy long continuing current component
• high-energy LCC component
• control-volume finite element method
• CV finite element method
• rear-face temperature rise measurement
• discrete CV unit
• internal node
• surface node
• edge node
• corner node

The front-face temperature rise of Al alloy subjected to the high-energy long continuing current (LCC) component in lightning is important but difficult to measure. Therefore, a numerical inversion model based on the control volume finite element method is proposed to analyse the front-face temperature rise of Al alloy deduced from the rear-face temperature rise measured in simulated LCC experiment. In this model, Al sample is divided into discrete control-volume units with continuous medium by grids, forming internal nodes, surface nodes, edge nodes, and corner nodes. Temperature governing equations for different nodes are derived from Fourier's heat conduction law and solved with finite difference method in time and spatial domain. The secant method is used to make the optimal approximation to experimental data. The results show that subjected to LCC with amplitude 404A and duration 520ms, the highest front-face temperature rise of Al alloy is 10,800K. The damaged area calculated by the proposed model is 298.7mm(2). The relative error is 4.8% compared with the experimental result 314.0mm(2). The energy consumed in all processes is 6710.1J calculated by this model, in contrast to the total energy 7140.9J generated from the arc and Joule heat.

• 出版日期2018-7
• 单位上海交通大学