飞机充氧阀头材料静电放电引燃性研究

Study on electrostatic discharge ignition of aircraft oxygen filling valve head

飞机充氧过程中,可能发生充氧阀头静电放电引起的火灾事故。为研究充氧阀头静电放电引燃特性,文章结合充氧阀头静电放电能量分析,进行了高压纯氧环境下飞机充氧阀头材料的静电放电引燃实验研究,并对其静电放电引燃可能性展开了初步讨论。结果表明:在实验的纯氧压强范围内,阀头尼龙材料的最小点火能量随气压升高迅速减小;在0.1 MPa时,最小点火能量为750.78 mJ;而当压强为3 MPa时,最小点火能量已降至0.55 mJ,并低于所分析的mJ量级的充氧阀头静电放电能量上限值,具有静电放电引燃的可能性。研究结果可为飞机氧气系统静电危险性及3 MPa以上气压下阀头静电放电引燃特性研究提供参考。

In the process of aircraft oxygen filling,fire accidents caused by electrostatic discharge of the oxygen filling valve head may occur.In order to study the ignition characteristics of the electrostatic discharge of the oxygen filling valve head,combined with the analysis of the electrostatic discharge energy of the valve head,an electrostatic discharge ignition test of the aircraft oxygen filling valve head material under high pressure pure oxygen environment is conducted,and the possibility of its ignition is preliminarily discussed.The results show that the minimum ignition energy of valve head made of nylon material rapidly decreases with the increase of air pressure within the experimental pure oxygen pressure range;the minimum ignition energy is 750.78 mJ at 0.1 MPa;and when the pressure is 3 MPa,the minimum ignition energy drops to 0.55 mJ,which is lower than the upper limit of the electrostatic discharge energy of the oxygen filling valve head in the magnitude of mJ.The possibility of ignition by electrostatic discharge cannot be excluded.The research results can provide reference for the study on the electrostatic risk of aircraft oxygen system and the electrostatic discharge ignition characteristics of valve heads under the pressure above 3 MPa.