Heat Transfer Experimental Investigation for Piston Rod Sensor in Hydraulic Servo Actuator of Hypersonic Combustion Ramjet Engine Vectoring Nozzle

摘要

We present an experimental study of a novel active cooling approach by the hydrocarbon fuel RP-3 flowing through a piston rod displacement-sensor in hydraulic servo-actuator. The temperature and pressure distributions of the experimental sample are compared under different thermal and flow parameters. Furthermore, two kinds of equivalent convective heat transfer coefficients on the inner and outer surfaces of the experimental sample are also calculated and analyzed. The results confirm that, our cooling approach can effectively protect the piston rod displacement-sensor from high ambient temperature and the flow rate of the cooling fuel through the piston rod displacement-sensor is the significant influence factor for the thermal protective performance. Under certain circumstances, with the decrease of the flow rate of the cooling fuel, the outlet fuel temperature increase and the equivalent convective heat transfer coefficient on the inner surface of the experimental sample decrease, obviously.