In order to study the influence mechanism of temperature measurement coating on measuring accuracy of fine thermocouple

a three-dimensional model for film-cooled vane was established based on conjugated heat transfer(CHT) method. SST(shear stress transport) γ -θ turbulence model was carried out on the film-cooled vane sprayed with alumina coating on the front edge of suction

front edge of pressure and trailing edge of pressure surface. The error between the numerical results and the experimental results was controlled below 5%

verifying the effectiveness of the numerical method. The results showed that

the coating had a significant effect on the flow characteristics of gas near the wall. However

the numerical results of three coating conditions showed that the temperature difference amplitude at the front edge of pressure was smaller than that at the front edge of suction

and the temperature measurement error was 35.5% lower than that at the trailing edge of pressure. In addition

on the pressure surface and the front edge of suction

the best temperature measurement area was between the middle and the lower end of the coating

while on the trailing edge of the pressure surface

the best temperature measurement area was close to the upper end of the coating.