民用飞机发动机灭火系统地面试验技术研究

Ground test technology of nacelle fire protection system for civil airplane

确保民用飞机的高安全性,是民机设计的一个重要目标。发动机火区的防火、灭火功能尤其重要。根据适航条款的要求,提出一种适用于民用飞机发动机灭火系统地面试验室试验的方法。该方法采用一种微压差式灭火剂浓度测试系统,在模拟真实发动机内外形和舱内流场的发动机灭火性能验证试验台上进行试验。该试验同时模拟机上最严苛的试验环境,验证最严苛试验工况下发动机灭火试验的灭火剂扩散情况。该试验采用高精度传感器测试试验参数,记录试验数据,并按FAA条款比对试验结果。通过地面试验室试验验证,该试验方法能有效、准确的实现发动机灭火系统地面试验室试验目标。该试验结果能为机上试验提供试验经验,为机上喷嘴构型更改、灭火管网布设提供重要参考依据。

The high security of civil aircraft is one important goal of airplane design.The fire protection function and fire extinguish function of nacelle is particularly important.According to airworthiness articles,this paper presents a ground test method which is suitable for nacelle fire protection system of civil airplane.In this method,a system based on micro-differential pressure was used to measure agent concentration in nacelle,and the test was carried out on the nacell fire extinguishing performance verification test bench which simulated the real internal and external shape and the flow field of true nacelle.At the same time,the hardest circumstances were simulated in order to verify the diffusion of fire extinguish agent of nacelle under the hardest test circumstances.In this test,high-accuracy sensors were used to measure test parameters,record the test data,and compare the test results according to FAA articles.It is proved that the method can effectively and accurately achieve the test goal of the nacell fire extinguish system by ground test.The test results can provide experience for the on-board test,and provide important reference for the configuration change of on-board nozzle and the layout of fire extinguish pipe network.