Protection Performance Investigation of an Infrared Temperature Measurement Probe for Gas Turbine

Abstract

For the temperature monitoring requirements of gas turbine blades, a new infrared temperature measurement probe structure is designed in this paper. Cooling air is used to cool the probe and prevent flue gas flowing into the probe. The computational fluid dynamics method is used to analyze the working process of the temperature probe. Two cases that the optical opening of probe is facing to and on the back of flue gas are considered. The influences of the air inlet total pressure on the pollution protective performance and thermal protective performance of the probe are analyzed. The results show that when the optical opening of probe is facing to flue gas, the pollution protective performance is poorer while the thermal protective performance is better than that when facing to gas. According to the temperature distribution of the probe, three optimization schemes of the probe are proposed: spraying thermal barrier coating on the wall of the probe, drilling film holes at the bottom of the probe, and combining film holes with thermal protective performance. The results show that the probe maximum temperature is reduced by 97, 187 and 328 K by using these three methods, respectively.