Conjugate heat transfer 3-D optimization for turbine stator

To avoid the turbine blade tail edge ablation and improve the aerodynamic performance, conjugate heat transfer optimization was used to change the parameters of blade profiles and bowed blade. The blade profiles optimization and bowed blade optimization were carried out independently. The results show that during the blade profile optimization as the blade profiles are changed and the mass flow of the coolant increases by 2.68%, the average temperature of the blade decreases by 4.15% and the maximum temperature decreases by 61.7 K, also the aerodynamic efficiency increases by 0.17%. During the process of bowed blade optimization, the effect of blade positive curving near the tip is obvious, the mass flow of the coolant increases by 0.11%, the average temperature decreases by 2.4%, the maximum temperature decreases by 10.6 K and the aerodynamic efficiency increases by 0.16%. For the blade with small diameter-blade height ratios, there are two major factors influencing the efficiency, the first one is the decrease of the shock loss and the second one is the decrease of the end wall loss as the low energy fluids near the end wall moves into the mainstream. The increase of the coolant mass flow and the reduction of secondary flow are the major factors lowering the blade temperature.