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research-article

Improving Purge Air Cooling Effectiveness by Engineered End-Wall Surface Structures ? Part I: Duct Flow

[+] Author and Article Information
Xin Miao

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

Qiang Zhang

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

Chris Atkin

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

Zhengzhong Sun

Department of Mechanical Engineering & Aeronautics, City University 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:10.1115/1.4040853 History: Received January 31, 2018; Revised July 11, 2018

Abstract

Motivated by the recent advances in Additive Manufacturing (AM), this study investigated a new turbine end-wall aerothermal management method by engineered surface structures. The feasibility of enhancing purge air cooling effectiveness through a series of small-scale ribs added onto the turbine end-wall was explored experimentally and numerically in this two-part paper. Part I presents the fundamental working mechanism and cooling performance in a 90-degree turning duct (Part I), and Part II of this paper validates the concept in a more realistic turbine cascade case. In Part I, the turning duct is employed as a simplified model for the turbine passage without introducing the horseshoe vortex. End-wall heat transfer and temperature were measured by the infrared thermography. CFD simulation was also performed using ANSYS FLUENT to compliment the experimental findings. With the added end-wall rib structures, purge air flow was observed to be more attached to the end-wall and cover a larger wall surface area. Both experimental and numerical results reveal a consistent trend on improved film cooling effectiveness.

Copyright (c) 2018 by ASME
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