Application of Curve Fitting in Measuring Inside-wall Surface Temperatures of Aero-engine

Curve fitting extrapolation was proposed to measure inside-wall surface temperatures of aero-engine by establishing transient high temperature testing system,with the help of screw thermocouple temperature sensor and multi-channel data acquisition card.On this basis,the sensors and high-speed infrared thermometer were simultaneously used to measure the surface temperature changing curves internal the wall coat of aero-engine respectively,with oxy-hydrogen flame simulating the transient high-temperature heat source within the aero-engine.The experimental results show that the extrapolation temperatures obtained by curve fitting are consistent with the temperatures detected by infrared thermometer in the overall trend,especially in the peak value with measuring precision of 1.84%,which proves the feasibility of this extrapolation method experimentally.