摘要
闪电击穿电压是飞机遭遇闪电雷击时会否在燃油箱内产生电火花的重要评判指标.为研究飞机燃油箱内典型燃油管路安装间隙下的闪电击穿电压,搭建了闪电击穿电压测试台架,并采用可调冲击电压发生器模拟出符合标准《SAE ARP5412B》要求的闪电电压波形.实验发现:安装间隙为3 mm时,实验室环境下测得的最小临界耐受击穿电压值为9.0 kV,飞机燃油箱内燃油管路周围部件的种类和燃油管路的安装形式对闪电击穿电压的影响不大,燃油管路的管径大小以及管路表面的油漆层对闪电击穿电压的影响可忽略不计,保持3 mm安装间隙不变,在部件表面涂覆1 mm厚密封胶,耐受击穿电压值从9.9 kV跃增至22.5 kV,安装间隙击穿所需的电压幅值大幅提高.实验结果表明:在燃油管路表面涂覆密封胶是减缓小间隙处发生闪电击穿风险的一种有效措施,可为飞机燃油管路安装间距选取和闪电防护设计提供参考和依据.
Abstract
Lightning breakdown voltage is a significant parameter in judging whether lightning spark is en-abled to generate in the fuel tank when an aircraft is struck by lightning.To investigate the lightning breakdown voltage of small gaps in aircraft fuel pipes installation,a test setup is built,and an adjustable impulse voltage generator is adopted to generate the lightning voltage waveform in accordance to the stand-ard SAE ARP5412B.The test results show that the minimum value of critical withstood breakdown volt-age measured in the laboratory environment is 9.0 kV at the installation gap of 3 mm.The types of com-ponents around the fuel pipes in fuel tank and the installation forms of the fuel pipes are almost not affect-ed by the lightning breakdown voltage of the installation gap.The effects of the lightning breakdown volt-age on the fuel pipes in diameter and on the surface of fuel pipes paint layer are negligible.The installation gap of 3 mm should be in good keep.The withstood breakdown voltage value increases from 9.9 kV to 22.5 kV by applying 1 mm thick sealant on the component surface,showing that the voltage amplitude re-quired for gap lightning breakdown is greatly increased.The researches indicate that coating sealant on the surface of fuel pipes is an effective measure to reduce the risk of lightning breakdown in small gaps.The tests results and research conclusions of this paper are available for reference and basis.
国家科技期刊平台
NSTL
万方数据