Numerical Research on the Swirl Cooling Using Thermal-Fluid-Structure Coupled Method for Turbine Blade Leading Edge

To analyze the thermal-fluid-structure characteristics of swirl cooling, a thermal-fluid-structure coupled model and a fluid model were established. The swirl cooling performance for two models was compared under the same boundary conditions. The temperature and structure characteristics of the thermal-fluid-structure coupled model were analyzed. Results showed that the solid wall heat transfer has little influence on the cooling air flow field, but the target wall heat transfer intensity is affected by the solid wall heat transfer to some extent. The target wall heat transfer intensity distribution for the thermal-fluid-structure coupled model is more uniform, while the solid wall heat transfer intensity between the high and low heat transfer regions decreases along the cooling air flow direction gradually. The heat transfer intensity of the high heat transfer region corresponding to swirl nozzle inlets increases along the cooling air flow direction. The target wall average heat transfer intensity for the thermal-fluid-structure coupled model has a 5.05% reduction compared with the fluid model. The target wall temperature is obviously influenced by the solid wall heat transfer. The target wall temperature of the thermal-fluid-structure coupled model is more uniform than the fluid model. The solid region's overall temperature of the thermal-fluid-structure coupled model increases gradually along the flow direction of the cooling air. The overall stress increases first and then decreases along the same direction, and the stress concentration occurs in the area near the hub and shroud. The overall strain has a similar changing trend with the overall stress, but a low strain region appears in the middle region on the solid heat transfer surface. © 2020, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.