Optimization Design of Lattice Structures in Internal Cooling Channel with Variable Aspect Ratio of Gas Turbine Blade

Traditional cooling structures in gas turbines greatly improve the high temperature resistance of turbine blades; however, few concern both heat transfer and mechanical performances. A lattice structure (LS) can solve this issue because its advantages being lightweight having porosity strength. Although topology LS is complex, it be manufactured with metal 3D printing technology future. In study, an integral optimization model concerning performances was presented to design channel a variable aspect ratio blades. Firstly, some internal channels thin walls were built up simple raw five cores taken as insert or turbulator these channels. Secondly, relations between geometric variables (height (H), diameter (D) inclination angle(?)) objectives/functions research, including first-order natural frequency (freq1), equivalent elastic modulus (E), relative density (?¯) Nusselt number (Nu), established for pyramid-type (PLS) Kagome-type (KLS). Finally, ISIGHT platform introduced construct frame model. Two selected problems (Op-I Op-II) solved based on third-order response accuracy more than 0.97, results analyzed. The showed that change Nu freq1 had highest overall sensitivity Op-I Op-II, respectively, D H single freq1, respectively. Compared initial LS, increased E by 24.1% 29.8%, decreased ?¯ 71%; Op-II 30.8% 45.2%, slightly ?¯; 27.9% 19.3%, These suggested transfer, load bearing improved (except performance optimal which became worse), while failed vibration LS.