TY - JOUR
T1 - Multi-parameter collaborative optimization and multi-physics coupling mechanisms in double-wall turbine blade cooling structures
T2 - A study based on orthogonal experimental design and response surface methodology
AU - Luo, Chun
AU - Wang, Xinmei
AU - Duan, Xiaofang
AU - Yang, Weizhu
AU - Sun, Shouyi
AU - Li, Lei
N1 - Publisher Copyright:
© 2026 Elsevier Masson SAS.
PY - 2026/8
Y1 - 2026/8
N2 - This study investigates the collaborative optimization of cooling efficiency and structural integrity in nickel-based single-crystal double-wall turbine blades (DWTB) under extreme conditions. Cooling efficiency is dominated by impingement holes (directly regulating coolant supply) and pin-fins (enhancing turbulent heat transfer). Maximum thermal stress is most sensitive to geometric discontinuities at the roots of the pin-fins, while maximum shear stress is primarily controlled by the film hole inclination angle through alterations in the local stress state at the hole edges. Creep life is mainly influenced by the film hole inclination angle, which modulates metal temperature and shear stress by varying cooling uniformity, thereby driving crystal slip damage. This study employs thermo-fluid-solid coupling simulations and an L25 (5⁴) orthogonal experimental design to investigate the effects of local cooling features (film holes, pin-fins, impingement holes) on both the cooling performance and structural integrity of a double-wall turbine blade. Through data-driven sensitivity analysis, cooling efficiency is shown to be dominated by the impingement-hole diameter (47.3 % contribution), maximum thermal stress is found to be most sensitive to the pin-fin diameter (31.9 %), and maximum shear stress is primarily governed by the film-hole inclination (43.6 %). Creep life is strongly influenced by the film-hole inclination (62.2 %), which highlights the critical role of geometric parameters in thermo-mechanical performance. In a subsequent multi-parameter response-surface optimization, a balanced design is obtained. This optimized configuration simultaneously improves cooling efficiency, reduces the maximum thermal stress, decreases the maximum shear stress, and extends creep life, demonstrating an effective trade-off among competing design objectives.
AB - This study investigates the collaborative optimization of cooling efficiency and structural integrity in nickel-based single-crystal double-wall turbine blades (DWTB) under extreme conditions. Cooling efficiency is dominated by impingement holes (directly regulating coolant supply) and pin-fins (enhancing turbulent heat transfer). Maximum thermal stress is most sensitive to geometric discontinuities at the roots of the pin-fins, while maximum shear stress is primarily controlled by the film hole inclination angle through alterations in the local stress state at the hole edges. Creep life is mainly influenced by the film hole inclination angle, which modulates metal temperature and shear stress by varying cooling uniformity, thereby driving crystal slip damage. This study employs thermo-fluid-solid coupling simulations and an L25 (5⁴) orthogonal experimental design to investigate the effects of local cooling features (film holes, pin-fins, impingement holes) on both the cooling performance and structural integrity of a double-wall turbine blade. Through data-driven sensitivity analysis, cooling efficiency is shown to be dominated by the impingement-hole diameter (47.3 % contribution), maximum thermal stress is found to be most sensitive to the pin-fin diameter (31.9 %), and maximum shear stress is primarily governed by the film-hole inclination (43.6 %). Creep life is strongly influenced by the film-hole inclination (62.2 %), which highlights the critical role of geometric parameters in thermo-mechanical performance. In a subsequent multi-parameter response-surface optimization, a balanced design is obtained. This optimized configuration simultaneously improves cooling efficiency, reduces the maximum thermal stress, decreases the maximum shear stress, and extends creep life, demonstrating an effective trade-off among competing design objectives.
KW - Creep
KW - Double-wall turbine blades
KW - Multi-parameter optimization
KW - Thermo-fluid-solid coupling simulation
UR - https://www.scopus.com/pages/publications/105031060959
U2 - 10.1016/j.ast.2026.111946
DO - 10.1016/j.ast.2026.111946
M3 - 文章
AN - SCOPUS:105031060959
SN - 1270-9638
VL - 175
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
M1 - 111946
ER -