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research-article

Numerical Investigation on the Modified Bend Geometry of a Rotating Multi-Pass Internal Cooling Passage in a Gas Turbine Blade

[+] Author and Article Information
Naris Pattanaprates

Kasetsart University, Department of Mechanical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand
naris.patt@gmail.com

Ekachai Juntasaro

King Mongkut's University of Technology North Bangkok, Department of Mechanical and Process Engineering, The Sirindhorn International Thai-German Graduate School of Engineering (TGGS), King Mongkut's University of Technology North Bangkok, Bangkok 10800, Thailand
ekachai.j@tggs.kmutnb.ac.th

Varangrat Juntasaro

Kasetsart University, Department of Mechanical Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand
varangrat.j@ku.th

1Corresponding author.

ASME doi:10.1115/1.4040654 History: Received July 23, 2017; Revised May 15, 2018

Abstract

The present work is aimed to investigate whether the modification to the bend geometry of a multi-pass internal cooling passage in a gas turbine blade can enhance heat transfer and reduce pressure drop. The two-pass channel and the four-pass channel are modified at the bend from the U shape to the bulb and bow shape. The first objective of the work is to investigate whether the modified design will still improve heat transfer with reduced pressure drop in a four-pass channel as in the case of a two-pass channel. It is found out that, unlike the two-pass channel, the heat transfer is not improved but the pressure drop is still reduced for the four-pass channel. The second objective is to investigate the rotating effect on heat transfer and pressure drop in the cases of two-pass and four-pass channels for both original and modified designs. It is found out that heat transfer is improved with reduced pressure drop for all cases. However, the modified design results in the less improvement on heat transfer and lower reduced pressure drop as the rotation number increases. It can be concluded from the present work that the modification can solve the problem of pressure drop without causing the degradation of heat transfer for all cases. The two-pass channel with modified bend results in the highest heat transfer and the lowest pressure drop for rotating cases.

Copyright (c) 2018 by ASME
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