Heat Transfer Analysis for Solenoid-Valve in Hydraulic Servo Actuator of Aero Engine Thrust Vector Nozzle

摘要

This paper proposes a cooling approach, which creates a flow channel outside the fixing screw sleeve of the solenoid-valve. The effectiveness of this cooling approach is demonstrated by a three-dimensional computational fluid dynamic simulation of the flow channel and a heat transfer analysis. The effects of the inlet temperature of cooling medium and the environment temperature and the inlet flow rate of cooling medium on the temperature of the solenoid-valve were studied. With the increase of the inlet flow rate, the velocity of the flow field is increase, which caused the convective heat transfer coefficient to increase. Under the same conditions, the temperature of solenoid-valve with the cooling approach is lower than the solenoid-valve without the cooling approach, when the inlet flow rate is increased from 0.127L/min to 0.45L/min, the temperature of the solenoid-valve is reduced by 17%. When inlet flow rate is 0.3L/min, the environment temperature is in the range of 215~250 °C and the inlet temperature of cooling medium is in the range of 70~110 °C, the solenoid-valve temperature increases 8.9°C when the inlet temperature of cooling medium increases 10'C with the environment temperature unchanged.