Research Papers: Gas Turbines: Heat Transfer

Convective Heat Transfer and Pressure Loss in Rectangular Ducts With Inclined Pin-Fin on a Wavy Endwall

[+] Author and Article Information
Kenichiro Takeishi

e-mail: takeishi@mech.eng.osaka-u.ac.jp

Yutaka Oda

e-mail: oda@mech.eng.osaka-u.ac.jp
Department of Mechanical Engineering,
Osaka University,
2-1 Yamadaoka, Suita,
Osaka 565-0871, Japan

Yoshiaki Miyake

Guidance & Propulsion Division,
Aerospace Systems,
Mitsubishi Heavy Industries Ltd.,
1200 Higashitanaka, Komaki,
Aichi 485-8561, Japan
e-mail: yoshiaki_miyake@mhi.co.jp

Yusuke Motoda

Washlet Development Department No.1,
Toto Ltd.,
1-1-1 Maigaoka, Kokuraminami-ku,
Kitakyushu, Fukuoka 803-0823, Japan
e-mail: yusuke.motoda@jp.toto.com

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received October 4, 2012; final manuscript received November 7, 2012; published online May 20, 2013. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 135(6), 061902 (May 20, 2013) (10 pages) Paper No: GTP-12-1390; doi: 10.1115/1.4023261 History: Received October 04, 2012; Revised November 07, 2012

Local endwall heat transfer characteristics and overall pressure loss of normal and inclined pin fins arrayed in rectangular ducts with flat and wavy endwalls have been investigated to improve the cooling efficiency of jet engine combustor liners. The detailed time-mean local Nusselt number profiles were measured using a naphthalene sublimation method based on the heat/mass transfer analogy. Four kinds of angled pin fins (−45, 0, and +45 deg with a flat endwall, and −45 deg with a wavy endwall) were tested and compared with each other. As a result, the average heat transfer coefficient on the flat endwall of normal pin fins was higher than that of the angled pin fins. The average heat transfer coefficient of −45-deg inclined pin fins with a wavy endwall is the same or a little higher than the heat transfer coefficient of those with a flat endwall; however, the pressure loss of the −45-deg inclined pin fins with a wavy endwall is less than the pressure loss of those with a flat endwall. Corresponding numerical simulations using large eddy simulation (LES) with the mixed time scale (MTS) model have been also conducted at Red = 1000 for fully developed regions, and the results have shown good quantitative agreement with mass transfer experiments. It can be concluded that wavy endwalls can realize better heat transfer with less pressure loss as long as the aim consists in enhancing endwall heat transfer in inclined pin-fin channels.

Copyright © 2013 by ASME
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Fig. 4

Computational domain

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Fig. 6

Local Nusselt number distribution (−45 deg flat)

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Fig. 5

Local Nusselt number distribution (0 deg flat)

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Schematic of wavy endwall configuration

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Fig. 2

Schematic of pin-fin configuration

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Fig. 1

Schematic of experimental apparatus

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Fig. 10

Averaged Nusselt number versus Reynolds number (at 5th row)

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Fig. 7

Local Nusselt number distribution (+45 deg flat)

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Fig. 8

Local Nusselt number distribution (−45 deg wavy)

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Fig. 9

Comparison of Nusselt numbers

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Fig. 12

Comparing Nud distribution at Red = 1000

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Fig. 13

Contour maps of vertical velocity

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Fig. 14

Contour map of u and velocity vectors v and w

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Fig. 11

Comparing Nud distribution at Red = 1000

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Fig. 15

Contour map of turbulent intensity and velocity vectors of u and w




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