Solution and numerical simulation of thermal-structural characteristics model of wire deflagration based on partition coupling time domain propulsion method

Abstract

The dynamic analysis of transmission lines under the thermal shock load of mountain fire is a complex nonlinear coupling problem of thermal structure. Taking the transmission line as the research object, based on the temperature rise model of mountain fire deflagration space, considering the temperature characteristics of the wire, the mathematical model of the thermal structure coupling characteristics of the wire deflagration is established. In this paper, the partition coupling time domain propulsion method is used to solve the problem. Through MATLAB programming and ANSYS secondary development, the transient characteristics and dynamic response of the coupling effect of the heated structure of the LGJ-400/35 wire with a span of 100 m under different positions and numbers of deflagration points are simulated. It is concluded that the temperature rise rate is positively correlated with the displacement rate and negatively correlated with the stress reduction rate. When the temperature rise rate increases by 0.1 °C/s, the displacement rate increases by 0.0004 m/s. The global deflagration is the most unfavorable mountain fire condition, and the temperature rise rate and displacement rate of the wire under this condition are about 1.3 and 1.9 times that of each single deflagration point condition. The wire temperature is symmetrically distributed with the detonation point symmetrically arranged relative to the mid-span.