An inverse optimization of turbulent flow and heat transfer for a cooling passage with hierarchically arranged ribs in turbine blades

Owing to the limited cold-air amount and pressure in supply systems, high-efficient heat transfer with low-level friction loss is highly desired for cooling units of a turbine blade. To exploit the potential improvement of hierarchically arranged ribs in cooling passages proposed previously, multi-parameter optimizations for rib arrangements are implemented by integrating the simplified conjugate-gradient algorithm with the turbulent flow and heat transfer model. Rib heights as design variables are optimized with various performance indices as objective functions at a fixed Re. The optimizations confirm that using the wall temperature difference and Nu as the objective function, respectively, a limited heat transfer improvement is achieved with a greatly increased friction loss. Taking the overall performance factor as the objective function, different optimal designs at different constraint conditions possess hierarchical characteristics. A significant friction loss reduction of 52.1%, 54.7%, and 54.8%, is achieved with a moderate heat transfer loss of 10.9%, 7.0%, and 2.3%. Despite different thermal and friction performances, their overall performances are consistent with a remarkable increase of 13.9%, 21.2%, and 27.3%. Finally, the optimization strategy coupling the multi-parameter optimization and hierarchical scheme is confirmed as effective for enhancing the thermohydraulic performance of convective heat transfer systems with perturbation elements.

Lian, We KaiNorth China Electric Power University (författare)
Meng, Jia XingNorth China Electric Power University (författare)
Wang, He ChenNorth China Electric Power University (författare)
Gao, Shu RongNorth China Electric Power University (författare)
Yang, Yan RuNorth China Electric Power University (författare)
Li, Hai WangBeihang University (författare)
Sunden, BengtLund University,Lunds universitet,Värmeöverföring,Institutionen för energivetenskaper,Institutioner vid LTH,Lunds Tekniska Högskola,Heat Transfer,Department of Energy Sciences,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)vok-bsu (författare)
Wang, Xiao DongNorth China Electric Power University (författare)
North China Electric Power UniversityBeihang University (creator_code:org_t)

Av författaren/redakt...: Zheng, Shao Fei; Lian, We Kai; Meng, Jia Xing; Wang, He Chen; Gao, Shu Rong; Yang, Yan Ru; visa fler...; Li, Hai Wang; Sunden, Bengt; Wang, Xiao Dong; visa färre...

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