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采用集总参数法,对航空发动机矢量喷管作动器伺服阀进行了非稳态热分析,建立了相应的数学模型,研究了环境温度、伺服阀初始温度和伺服阀焦耳热对伺服阀温度随时间的变化规律。结果表明:伺服阀的稳定温度只随环境温度和伺服阀焦耳热的增大而升高,与伺服阀初始温度无关。伺服阀超温时间随着初始温度、环境温度、伺服阀焦耳热的增大而缩短:环境温度为300℃,伺服阀焦耳热为0.08W时,初始温度从50℃到100℃,超温时间缩短20.6%。伺服阀焦耳热为0.08W,初始温度为70℃,环境温度从250℃上升400℃时,超温时间缩短了60.8%。环境温度为300℃,初始温度为122.6℃时,10W的伺服阀焦耳热相比0.08W,超温时间缩短了38.3%。
Using the lumped parameter method, the unsteady thermal analysis of aero-engine vector nozzle actuator servo valve was carried out. The corresponding mathematical model was established. The effects of ambient temperature, servo valve initial temperature and servo valve Joule heating on the servo valve temperature Variation with time. The results show that the steady temperature of the servo valve only increases with the ambient temperature and the Joule heating of the servo valve, regardless of the initial servo valve temperature. Servo valve over-temperature time decreases with the increase of initial temperature, ambient temperature and servo-valve Joule heat: ambient temperature is 300 ℃, servo valve Joule heat is 0.08W, initial temperature is from 50 ℃ to 100 ℃, over-temperature time Shorten 20.6%. The servo valve Joule heat is 0.08W, the initial temperature is 70 ℃. When the ambient temperature rises from 250 ℃ to 400 ℃, the over-temperature time is shortened by 60.8%. Ambient temperature of 300 ℃, the initial temperature of 122.6 ℃, 10W servo valve Joule heat compared to 0.08W, over-temperature time shortened by 38.3%.