喷射气流灭弧防雷间隙气流通道优化

Airflow Channel Optimization of Jet Stream Arc-Quenching Lightning Protection Gap

为提高喷射气流灭弧防雷间隙的灭弧能力,了解其灭弧原理以及气流通道管控长度对灭弧过程的影响是非常重要的。从能量平衡角度分析了喷射气流熄灭电弧的可行性,推导得出了气流速度与气流通道管控长度呈正相关,增大气流通道管控长度能够促进气流发展,增强对流散热功率,加速电弧冷却,从而提升灭弧效率。通过COMSOL Multiphysics仿真平台搭建了灭弧通道的二维几何模型,模拟了电弧在气流耦合作用下的放电传热过程,证明了装置的灭弧有效性;然后改变气流通道管控长度变量,得出相应仿真结果并对比分析;最后设置灭弧实验进行了验证。结果表明,延伸气流通道管控长度能够更加快速有效地熄灭电弧并抑制电弧重燃,进一步优化了喷射气流灭弧防雷间隙的灭弧性能。

In order to improve the arc-quenching capability of jet stream arc-quenching lightning protection gap,it is very important to understand the arc-quenching principle and the influence of the controlled length of airflow channel on the arc-quenching process.This paper analyzes the feasibility of the jet stream to extinguish the arc from the perspective of energy balance,and deduces that the velocity of the airflow is positively correlated with the controlled length of airflow channel,and that increasing the controlled length of airflow channel can promote the airflow development,enhance convective heat dissipation power,accelerate arc cooling,and thus improve the arc-quenching efficiency.A two-dimensional geometric model of the arc-quenching channel is built through COMSOL Multiphysics simulation platform,and simulation of the arc discharge heat transfer process under the coupling of airflow is carried out,the effectiveness of the arc-quenching device is verified.Then the variable of the controlled length of airflow channel is altered to obtain the corresponding simulation results for comparative analysis.Finally,the arc-quenching experiment is setup for verification.The results show that extending the controlled length of airflow channel can extinguish the arc and inhibit arc reignition more quickly and effectively,further optimize the arc-quenching performance of the jet stream arc-quenching lightning protection gap.