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research-article

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

[+] Author and Article Information
Xin Miao

Department of Mechanical Engineering & Aeronautics, City, University of London, Northampton Square, London, EC1V 0HB, United Kingdom
xin.miao@city.ac.uk

Qiang Zhang

Department of Mechanical Engineering & Aeronautics, City, University of London, Northampton Square, London, EC1V 0HB, United Kingdom
qiang.zhang.1@city.ac.uk

Chris Atkin

Department of Mechanical Engineering & Aeronautics, City, University of London, Northampton Square, London, EC1V 0HB, United Kingdom
chris.atkin.1@city.ac.uk

Zhengzhong Sun

Department of Mechanical Engineering & Aeronautics, City, University of London, Northampton Square, London, EC1V 0HB, United Kingdom
zhengzhong.sun@city.ac.uk

Yansheng Li

Siemens Industrial Turbomachinery Limited, Lincoln LN5 7FD, UK
yansheng.li@siemens.com

1Corresponding author.

ASME doi:10.1115/1.4040854 History: Received January 31, 2018; Revised July 11, 2018

Abstract

Motivated by the recent advances in Additive Manufacturing (AM), 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-degree 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 were observed from experimental data, especially for higher blow ratios. The 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.

Copyright (c) 2018 by ASME
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