Geometrical optimization of nonuniform impingement cooling structure with variable-diameter jet holes

Through single-objective GA search, an optimal nonuniform impingement cooling design was automatically found costing only dozens of CFD runs. The optimal design provided a more uniform temperature distribution on the vane surface while using equivalent coolant amount compared with the prototype. It was also demonstrated that multiple-objective optimization search could efficiently found a series of optimal cooling designs at various coolant amounts (Pareto front) with quite uniform wall temperature distributions on the vane surfaces cooled by impingement jets. Meanwhile the relationship between overall cooling performance and total coolant amount was investigated. In sum, it is anticipated that the nonuniform impingement structure together with its design optimization methods should be a beneficial extension of internal cooling technology of gas turbine.