A coupled flow-thermal model was established for 3D heat transfer of turbine blade with air cooling.Radiation heat was added into the energy equation as a source of heat radiation.Using coupled flow-thermal model

3-D conjugated heat transfer for turbine blade with air cooling was accomplished.And

heat radiation was solved with P-1 model.The different surface temperatures and temperature distributions of the blades with/without heat radiation was compared.The results show that

for high-temperature gas at 1 600 K

heat radiation is a significant heat source.If radiation heat is considered

the surface temperature of the blade is improved greatly

leading to obvious difference of temperature distribution.