An Improvement Of Performance And Thermal-Stress Coupled Analysis In The Internal Cooling Structures Of Turbine Blade

The design procedure of turbine blade and internal cooling structures is extremely harsh for the increasing of the turbine inlet temperature. The developed cooling technology and the improvement of cooling structure are used to reduce the blade temperature. In this paper, the study of thermal-stress coupled analysis and flow-heat transfer research are imposed on the internal cooling structures, and the improvement of cooling structure is also given.(1) the multi-physics conjugate of turbine blade for the flow, heat transfer and stress has been investigated. Firstly, compared with the experimental datum, the SST k-w turbulence model performs its superior in the ability of predicting the adverse pressure gradient, shock wave and transition behavior. And the flow and heat transfer characteristics, including the boundary layer flow fields, the aerodynamic characteristics, the heat convection and the heat conduction, are also investigated for the turbine vane. Finally, the thermal-stress coupling simulation is finished using the mesh of the fluid-solid coupling simulation in the help of data exchange parameterization.(2) the improvement of the rib has been studied to enhance the heat transfer in the lee-side of rib and the bottom wall. A conclusion to be drawn is that the heat transfer in the region covered by the recirculation flow has been improved, and the larger inclined angle means the better heat transfer performance. Focused on the smallest heat transfer area, the 150° chamfer rib provides a highest heat transfer enhancement associated with the received friction enlargement.(3) an investigation of ribbed channels combined with differently shaped deflectors and structure parameters is conducted to study the influence on heat transfer and flow characteristics. The high turbulent region from sloping board deflectors almost covers half of the channel because of the severe disturbance, which effectively improves the heat transfer performance. While the cylindrical and ellipse deflectors provide the worst disturbance, which decrease the negative pressure region and the counter-rotating vortex due to the flow separation. The highest friction factor is given by the convex curved deflectors. In addition, the higher rib-pitch-to-rib-height ratio presents the best overall performance, and the wide-aspect-ratio channel performs better than the narrow-aspect-ratio channel in heat transfer but with the increasing flow resistance.