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Improving Purge Air Cooling Effectiveness by Engineered End-Wall Surface Structures-Part II: Turbine Cascade

Miao, X., Zhang, Q. ORCID: 0000-0003-0982-2986, Atkin, C.J. ORCID: 0000-0003-2529-1978, Sun, Z. and Li, Y. (2018). Improving Purge Air Cooling Effectiveness by Engineered End-Wall Surface Structures-Part II: Turbine Cascade. Journal Of Turbomachinery, 140(9), 091002. doi: 10.1115/1.4040854

Abstract

Motivated by the recent advances in additive manufacturing, a novel turbine end-wall aerothermal management method is presented in this two-part paper. The feasibility of enhancing purge air cooling effectiveness through engineered surface structure was experimentally and numerically investigated. The fundamental working mechanism and improved cooling performance for a 90 deg turning duct are presented in Part I. The second part of this paper demonstrates this novel concept in a low-speed linear cascade environment. The performance in three purge air blowing ratios is presented and enhanced cooling effectiveness and net heat flux reduction (NHFR) were observed from experimental data, especially for higher blow ratios. The Computational fluid dynamics (CFD) analysis indicates that the additional surface features are effective in reducing the passage vortex and providing a larger area of coolant coverage without introducing additional aerodynamic loss.

Publication Type: Article
Additional Information: © ASME 2018
Publisher Keywords: Flow (Dynamics) , Temperature , Cooling , Computational fluid dynamics , Turbines , Vortices , Blades , Cascades (Fluid dynamics) , Heat flux , Film cooling
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
URI: http://openaccess.city.ac.uk/id/eprint/20897
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