Coupling characteristics and simplification analysis method of laminated cooling configuration between external and internal cooling

This study presents a method to decouple the cooling process of laminated cooling configuration and analyze the coupling characteristics between internal and external cooling. Based on it, two simplification methods of external cooling are developed to predict the coupled cooling performance and its distribution. Employing verified numerical method, five series of cooling process simulations are conducted under different blowing ratios. Results show that, the similar vortices structure among coupled, internal, and external cooling demonstrate that the decoupled method can effectively decouple the internal and external cooling and keep the same flow pattern. In laminated cooling, internal cooling contributes most of cooling performance and heat transfer capacity, and external cooling mainly influences the distribution characteristics due to its intensively regional cooling performance. While coupled cooling presents superposition characteristics of internal and external cooling, they will counteract about 17.88% cooling performance. The almost same local and overall cooling effectiveness and distribution under different blowing ratios demonstrate that simplifying external cooling to convective boundary condition and replacing with external cooling correlation formulas can effectively capture cooling performance and heat transfer characteristics with an average error of 12.91%. Further, the presented prediction formula can effectively predict area-averaged cooling effectiveness with maximum deviation of 8.8%.