具有回油冷却结构的航空伺服作动器热力学建模与分析  

Thermodynamic Modeling and Analysis of Aviation Servo Actuator with Return Oil Cooling Structure

作　　者：訚耀保[1] 刘小雪 李双路 李万业 陆畅 肖强 YIN Yaobao;LIU Xiaoxue;LI Shuanglu;LI Wanye;LU Chang;XIAO Qiang(School of Mechanical Engineering,Tongji University,Shanghai 201804,China;Changchun Control Technology Co.,Ltd.,Aero Engine Corporation of China,Changchun,Jilin 130102,China)

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]中国航空发动机集团长春控制科技有限公司,吉林长春130102

出　　处：《北京理工大学学报》2023年第2期143-150,共8页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(52175059);国家重点研发计划项目(2018YFB2001100)。

摘　　要：航空矢量喷管作动器受发动机热辐射的影响严重,常采用回油冷却方式进行作动器及其部件的温度控制.考虑发动机与伺服阀控作动器的对流、辐射以及作动器各部件之间的传热过程,建立真实工况下基于集总参数法的矢量喷管作动器热力学模型,取得了活塞在中位附近以及往复运动时作动器各部件的温度分布规律及其影响因素.分析结果表明:活塞在中位附近时,油液流过冷却流道通过热传导作用带走热量,冷却效果显著.活塞往复运动时,油液不断进出有杆腔和无杆腔,各节点温度达到稳定波动状态,较中位附近时的热平衡温度均有所降低.作动器各节点温度随机闸辐射温度、环境温度和油液温度升高均升高,其中发动机机闸的辐射温度影响最为明显.缸筒直接受机闸热辐射作用,某机闸温度从300℃升至400℃时,左、右两侧缸筒温度升高约40℃.通过对流换热作用,随环境温度、油液温度的升高作动器各节点的温度线性升高.Aviation vector nozzle actuators are seriously affected by the heat radiation of the engine, thus, the oil return cooling method is often used to control the temperature of the actuator components. Considering the convection and radiation between the engine and the servo valve actuator, and the heat transfer process of each component of the actuator, a thermodynamic model of the vector nozzle actuator was established based on the lumped parameter method under real working conditions. The model was used to analyze and obtain the temperature distribution law and its influencing factors of each component of the actuator during the piston in neutral position and reciprocate. The analysis results show that when the piston is in near the neutral position, the oil flow passes the cooling channel, taking away heat through heat conduction, getting better cooling effect. When the piston reciprocates, the oil continuously enters and exits the rod cavity and the rodless cavity, and the temperature of each node can reach a stable fluctuation state and be lower than the thermal equilibrium temperature of the neutral position. The temperature of each node of the actuator increases with the increase of the radiation temperature, ambient temperature and oil temperature, among which the radiation temperature of the engine brake has the most obvious influence. The cylinder barrel is directly affected by the thermal radiation of the brake. When the temperature of the brake rises from 300 ℃ to 400 ℃, the temperature of the cylinder barrel on the left and right sides can increase by about 40 ℃. Through convective heat transfer, the temperature of each node of the actuator can increase linearly with the increase of ambient temperature and oil temperature.

关 键 词：伺服作动器 集总参数法 回油冷却 热力学建模 

分 类 号：TH137[机械工程—机械制造及自动化]