发动机喷口喉道面积控制异常故障分析与改进设计  

Fault Analysis and Improvement Design of Nozzle Throat Area Abnormal Control of Engine

作　　者：夏鹏 李鹏伟 王松 XIA Peng;LI Pengwei;WANG Song(AVIC Qingan Group Co.,Ltd.,Xi'an,Shaanxi 710077)

机构地区：[1]航空工业庆安集团有限公司,陕西西安710077

出　　处：《液压与气动》2025年第4期119-126,共8页Chinese Hydraulics & Pneumatics

摘　　要：发动机喷口喉道作动筒用于调节喷口喉道面积大小,实现发动机加力状态控制。针对发动机喷口喉道面积控制异常的故障原因,分析喷管作动系统工作原理,建立故障树,对底事件遂一排查;确定故障是由于活塞头同轴密封环在压力换向时产生倾斜,使作动筒有杆腔、无杆腔窜油内泄漏突增导致。在作动筒活塞头同轴密封环侧面增加导油凹槽,并模拟作动筒有杆腔、无杆腔压力换向的试验条件,开展试验验证。结果表明,作动筒活塞头同轴密封环侧面增加导油凹槽后,减少了作动筒压力换向时的内泄漏量,提高了作动筒活塞头密封性,解决了喉道面积控制异常故障,也为后续同类产品改进设计和新产品开发提供了指导。The engine nozzle throat actuator cylinder regulates the nozzle throat area to control the engine's afterburner operation.To diagnose abnormal nozzle throat area control,we analyze the actuation system's working principles,establish a fault tree,and conduct bottom events.The malfunction is determined to result from the tilting of the piston coaxial sealing ring during pressure reversal,which caused a sudden surge in internal oil leakage between the rod and non-rod chambers of actuator cylinder.By adding oil-guiding grooves on the lateral surface of the piston coaxial sealing ring,and simulating pressure reversal conditions in rod and non-rod chambers of actuator cylinder,experimental validation is performed.Results demonstrate that the modified design significantly reduce internal leakage under pressure reversal,enhance the piston seal integrity,and resolve the nozzle throat area control anomaly.This improvement provides critical guidance for optimizing similar products and developing newgeneration actuators.

关 键 词：喷口喉道面积 作动筒 控制异常 泄漏 

分 类 号：TH137[机械工程—机械制造及自动化]