Influence of turbulence model parameter settings on conjugate heat transfer simulation

Rationality of the parameter settings in turbulence model is an important factor affecting the accuracy of conjugate heat transfer (CHT) prediction. On the basis of a developed CHT methodology and the experimental data of Mark// cooling turbine blade, influences of the turbulence model parameter settings and the selection of turbulence models on CHT simulation are investigated. Results and comparisons with experimental data indicate that the inlet setting of the (v) over tilde in Spalart-Allmaras model has nearly no influence on flow and heat transfer in blade surface. The inlet turbulence length scale l(T) in the low-Reynolds number Chien k-epsilon turbulence model and the blade surface roughness in shear stress transport (SST) k-omega SST model have relatively obvious effects on the blade surface temperature which increases with the increase of them. Both of the laminar Prandtl number and turbulent Prandtl number have slight influences on the prediction, and they only need to be constant in CHT simulation. The k-omega SST model has the best accuracy in the turbine blade CHT simulation compared with the other two models.