Research on the Thermal Protection Performance of Infrared Thermometer Probe for Turbine Blades
This paper focused on the problem of poor thermal protection when the measuring opening of infrared thermometer probe for turbine blades towards to the gas flow direction.The CFD method was used to simulate and calculate the thermal protection strengthening effect when drilling film holes at the bottom of the probe protective sheath.The influence of the number and diameter of film holes on the ther-mal protection performance of the probe was studied.The temperature distribution and air film coverage characteristics on the wall of the protective sheath were analyzed,and the reasons for the differences in thermal protection performance were explored.The results show that the air film coverage extent at the bottom of the probe protective sheath gradually increases with the increases of the number or the diameter of air film holes.And the maximum temperature of the protective sheath shifts from the bottom of the probe to the side of the probe,which shows a change characteristic of first decreasing and then increas-ing.The optimal number of air film holes for thermal protection of the probe protective sheath is 5,and the optimal diameter of air film holes is 1.5 mm,which maximum temperature is 187 K lower than that without air film thermal protection.The convective heat transfer of the cooling air near the wall inside the probe protective sheath is the main factor affecting the temperature of the side wall of the probe protective sheath.
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