Improving purge air cooling effectiveness by engineered end-wall surface structures-Part II: Turbine Cascade

Xin Miao, Qiang Zhang, Chris Atkin, Zhengzhong Sun, Yansheng Li

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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.

Original languageEnglish
Article number091002
Number of pages11
JournalJournal of Turbomachinery
Volume140
Issue number9
Early online date20 Aug 2018
DOIs
Publication statusPublished - 1 Sep 2018
Externally publishedYes

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