作动器位移传感器常规工况热防护研究

Conventional Condition Thermal Protection Research for Actuator Displacement Sensor

航空发动机矢量喷管作动器位移传感器在超温后工作失效。为实现位移传感器热防护要求,考虑了作动器内的导热和对流换热项,建立了作动器系统内各部分温度分布的数学模型。在常规工况允许的参数变化范围内,研究了作动器环境温度t_(wai)、入口工作介质温度tin和冷却衬套厚度Delta(δ)三个因素对位移传感器热防护的影响。结果表明:降低环境温度、降低作动器入口工作介质温度,减小冷却衬套厚度,均能有效降低位移传感器温度,建议通过合理设计作动器环境温度、入口工作介质温度和冷却衬套厚度实现位移传感器热防护。

A actuator displacement sensor works failure after it over-temperature.For its thermal protection requirement,the heat conduction and convection heat transfer within the actuator system were considered,and the mathematical model was established.With the parameters fluctuation were allowed by certain working condition,the influence of four factors on the displacement sensor temperature was studied,including the actuator inlet mass flow of working medium（M（in））,the ambient temperature（t（wai））,the inlet temperature of working medium（t（in）） and the thickness of cooling bushing（Delta）.The results showed that： Displacement sensor temperature decreases obviously by reducing the ambient temperature,the inlet temperature of working medium and the thickness of the cooling bushing.The thermal protection of the displacement sensor can be realized by changing the ambient temperature,the inlet temperature of working medium and the thickness of the cooling bushing.