矢量喷管作动器应急回中特性研究

Research on Emergency Return to Centering Characteristics of Vector Nozzle Actuator

针对军用航空发动机矢量喷管在故障状态下自动将矢量喷管拉回到安全位置的问题,在矢量喷管作动器中引入回中孔。为了保证矢量喷管作动器在航空发动机高温环境下正常工作,在作动器活塞头处设置了用于沟通作动器的两腔的冷却小孔,使得产品具有自动冷却功能。作动器同时设计有回中孔和冷却孔,并给出了两者同时存在时应急回中功能的工作原理。通过建立液压系统的AMESim仿真模型,得到冷却孔大小和管路对回中速度影响的仿真结果。仿真结果表明,冷却孔在一定范围内,伸出/收进回中速度随着冷却孔径的增大而增大/减小;管路越复杂越长,回中速度越低。研究结果对工程研制具有一定的指导意义。

Aiming at the problem that the vector nozzle of military aircraft engine automatically pulls the vector nozzle back to a safe position in a fault state,a centering hole is introduced into the vector nozzle actuator.In order to ensure the normal operation of the vector nozzle actuator in the high temperature environment of the aircraft engine,a cooling hole for communicating the two cavities of the actuator is set at the piston head of the actuator so that the product has an automatic cooling function.The actuator is designed with a centering hole and a cooling hole at the same time,and the working principle of the emergency centering function is given when both exist at the same time.By establishing the AMESim simulation model of the hydraulic system,the simulation results show that within a certain range of the cooling hole,the extension/retraction speed increases/decreases with the increase of the cooling hole diameter;the more sophiscated and longer the pipeline,the lower the return to centering speed.The result has certain guiding significance for engineering development.