Multi-Objective Optimization of the Impingement-Film Cooling Structure of a HIgh Pressure Turbine Endwall Using Conjugate Heat Transfer Computational Fluid Dynamics

[+] Author and Article Information
Zhongran Chi

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China

Haiqing Liu

Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, China

Shusheng Zang

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China

1Corresponding author.

ASME doi:10.1115/1.4037131 History: Received September 22, 2016; Revised May 27, 2017


This paper discusses the approach of cooling design optimization of a High Pressure Turbine (HPT) endwall with 3D Conjugate Heat Transfer (CHT) CFD applied. This study involved the optimization of the spacing of impingement jet array and the exit width of shaped holes, which were different for each cooling cavity. The optimization objectives were to reduce the wall temperature level and to increase the aerodynamic performance. The optimization methodology consisted of an in-house parametric design & CFD mesh generation tool, a CHT CFD solver, a database of CFD results, a metamodel, and an algorithm for multi-objective optimization. The CFD tool was validated against experimental data of an endwall at CHT conditions. The metamodel, which could efficiently estimate the optimization objectives of new individuals without CFD runs, was developed and coupled with Non-dominated Sorting Genetic Algorithm II to accelerate the optimization process. Through the optimization search, the Pareto front of the problem was found in each iteration. The accuracy of metamodel with more iterations was improved by enriching database. But optimal designs found by the last iteration are almost identical with those of the first iteration. Through analyzing extra CFD results, it was demonstrated that the design variables in the Pareto front successfully reached the optimal values. The optimal pitches of impingement arrays could be decided accommodating the local thermal load while avoiding jet lift-off of film coolant. It was also suggested that cylindrical film holes near throat should be beneficial to both aerodynamic and cooling performances.

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