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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

EFFECT OF JET SHAPE ON THE HEAT TRANSFER IN TRAILING EDGE MODEL

DOI: 10.1615/TFESC1.hte.012613
pages 1233-1244

Unal Uysal
Sakarya University, Mechanical Engineering Department, 54100 Sakarya/Turkey

Yuksel Korkmaz
Sakarya University, Mechanical Engineering Department, 54100 Sakarya/Turkey

MinKing K. Chyu
Department of Mechanical Engineering and Materials Science University of Pittsburgh, Pittsburgh, PA 15261, USA


KEY WORDS: Gas turbines cooling, Forced convection in ducts, Two pass channel, Impingement jets, Thermochromic liquid crystals.

Abstract

The effect of the jet hole geometries on the divider in the channel is experimentally investigated. In this study a trailing edge model that has two rectangular pass channels were designed, which consist of a divider piece patterned with multiple jet-nozzles of same geometries and distances in between. Three different jet shapes (circular, rectangular, square) have been used in this trailing edge model. Channel lengths are 198 mm. The first and second channels have widths of 20 mm and 40 mm respectively. The channels have a height of 20 mm. There are 9 holes placed on the divider piece and their cross sectional shapes are rectangular. The experimental studies were conducted based on three different Reynolds numbers (1.6×104, 2.067×104 and 2.47×104). Thermochromic Liquid Crystals (TLC) technique is used in this experimental study to analyze the actual flow in blade channels and to calculate the heat transfer coefficient.
It is seen that the heat transfer coefficient in the first channel is higher than the second channel. The lowest heat transfer values were obtained in the circular jet holes because of the smallest cross-sectional area. Although the highest speed occurred in the circular jet holes, the corresponding heat transfer coefficient values that occurred in the first and second channels were the lower than rectangular and square jet holes geometries. The effect of cross-flow decreased towards of the second channel. The results of this study are compared with the results of the study [8].

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