大型客机油箱结构雷电点火源防护验证

Ignition Source Prevention Demonstration of Lightning Strike to Large Civil Aircraft Fuel Tank

为确定大型客机油箱结构雷电点火源防护设计有效性,表明燃油箱防爆条款适航符合性,通过仿真分析与试验相结合进行点火源防护验证研究。仿真分析结果表明:对于大型客机传统铝合金油箱结构,在雷电直接影响下,油箱内部结构与系统管路电流电压分量很低,电流值仅为407 A,电压值仅为11 V,远小于能够引起油箱内部点燃的门槛值。通过试验考察,进一步证实了在雷电3区试验波形作用下,油箱内部不会产生高于200μJ能量的点火源。电流和电压试验实测值为175 A和100 V,量级与仿真分析相当。据此可表明,对于传统铝合金大型客机整体油箱,油箱内部雷电点火源防护是偏安全的。

In order to determine the lightning strike ignition source prevention effectiveness of large civil aircraft fuel tank, we derived the right analysis and demonstration method to show the compliance with the airworthiness regularity through simulation and real tests. The simulation results show that the response inside the traditional aluminum fuel tank is very low under a lightning direct effect environment. The measured current is only 407 A while the voltage is only 11 V which are far below the ignition threshold. By the test observation with lightning zone 3 waveform, the ignition source higher than 200 μJ does not occur inside the fuel tank. The current measured during test is 175 A and the voltage is 100 V. The test value is as the same level as simulation results. Based on the evidence that we have gotten, the safety of the traditional aluminum civil aircraft fuel tank ignition protection can be ensured.