Session: 15-05: Double-Wall Internal Cooling

Submission Number: 176331

Numerical Investigation on Internal Flow and Heat Transfer in Curved Double-Wall Cooling Structures 

With the advancement of turbine blade cooling technology, double-wall cooling structures have become a focal point of research. However, studies on curved double-wall structures with complex flow passages remain limited. This study employs numerical simulation methods to investigate the dimensionless convective heat transfer coefficient (h/h₀) distribution on target surfaces of both flat and convex double-wall structures (with bending angles of 15°, 30°, 45°, 60°, and 75°) under impingement Reynolds numbers (Re) ranging from 10,000 to 60,000. Computational fluid dynamics is used to analyze the internal flow characteristics and aerodynamic losses (ξ) for each angle. It is found that h/h₀ exhibits a multi-peak distribution along the spanwise direction for all bending angles. Beyond a critical Re, secondary peaks surpass primary peaks in magnitude. The averaged h/h₀ generally declines along the streamwise direction, with distinct variation patterns at different positions. As bending angle increases, heat transfer within the double-wall structure intensifies. At Re=40,000, the area-averaged h/h₀ for convex-75° is 10.45% higher than that of the flat structure. The area-averaged h/h₀ for all angles rises with increasing Re, but this growth rate slows significantly at higher Re. An increase in bending angle amplifies ξ, reflecting greater aerodynamic losses. This study provides support for refining cooling structures in double-wall turbine blades.

Presenting Author: Songqi Yu Research Institute of Aero-Engine, Beihang University

Presenting Author Biography: Yu Songqi, a doctoral student​ at Beihang University in China, specializes in research on turbine blade cooling design.

Authors:

Songqi Yu Research Institute of Aero-Engine, Beihang University
Ruquan You Research Institute of Aero-Engine, Beihang University
Xing Yuan Research Institute of Aero-Engine, Beihang University
Haiwang Li Research Institute of Aero-Engine, Beihang University
Runzhou Liu TaiHang National Laboratory