飞机静电放电器静电泄放性能的影响参数

Parameters Influencing the Electrostatic Discharge Performance of Aircraft Static Dischargers

飞机静电放电器用于泄放飞机沉积静电,降低飞机沉积静电危害,其静电泄放性能关系飞机沉积静电防护的效果。采用美军标推荐的试验方法,对某型后缘型复合材料飞机放电器静电泄放特性进行了测试、研究。在40kV负极性电压下,受试放电器泄放电流为20.9μA,当气流速度达到100m/s时,泄放电流增加预计达22μA;实测泄放电流值>10μA,受试放电器满足泄放电流要求。进一步分析表明:放电电压对放电器泄放电流影响符合抛物线关系,并存在阈值效应;对受试放电器,负极性阈值为20.4kV,正极性阈值为24.5kV;在试验风速下,气流流速对泄放电流影响符合正比例关系,且比例系数正比于所施加电压同阈值电压的差值。

Aircraft static discharger is used to release precipitation electrostatic and reduce the hazard of aircraft electrostatic. The discharge performance of electrostatic discharge is crucial for precipitation electrostatic protection. According to the testing method described in the American Military Standard, we researched the discharging characteristics of a composite trailing edge discharger. The release current was measured to be 20.9 μA under negative voltage of 40 kV, and the increment of release current is estimated to reach 22 μA when airflow of 100 m/s is applied. The result that the release current is larger than 10 μA at 40 kV indicates the discharger satisfies the specification requirements of discharge current. Further analysis indicates that the discharge current-voltage function satisfies a parabolic relationship in the range of discharging, while the threshold effect is significant. The negative polarity threshold is 20.4 kV, meanwhile the positive polarity threshold is 24.5 kV. Also, the discharge current-velocity of airflow satisfies a proportional relationship with the airflow we applied in our lab, and the scale coefficient is proportional to the difference between the applied voltage and the threshold voltage.