Technical Brief

Effect of Thermal Barrier Coating and Gas Radiation on Film Cooling of a Corrugated Surface

[+] Author and Article Information
Kuldeep Singh

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110016, India

B. Premachandran

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110016, India
e-mail: prem@mech.iitd.ac.in

M. R. Ravi

Department of Mechanical Engineering,
Indian Institute of Technology Delhi,
Hauz Khas,
New Delhi 110016, India

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 28, 2017; final manuscript received March 20, 2018; published online May 25, 2018. Assoc. Editor: Debjyoti Banerjee.

J. Heat Transfer 140(9), 094504 (May 25, 2018) (5 pages) Paper No: HT-17-1236; doi: 10.1115/1.4039761 History: Received April 28, 2017; Revised March 20, 2018

In this work, a numerical study is conducted to investigate film cooling of a corrugated surface. A conjugate heat transfer analysis is carried out, accounting for the presence of thermal barrier coating (TBC) and gas radiation. The Mach number of mainstream flow is maintained at Ma = 0.6, while cold stream Mach number is varied from 0.3 to 0.58, and density ratio is kept 4. From this study, it is observed that the overall film cooling effectiveness increases by a value ranging from 0.10 to 0.15 with the use of TBC. The hot side metallic wall temperature increases in the range of 100–150 °C when the effect of gas radiation is considered. It is also found that the film cooling effectiveness decreases with decrease in the cold side Mach number.

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Grahic Jump Location
Fig. 1

Computational domain used for numerical studies

Grahic Jump Location
Fig. 2

Temperature along the centerline of the test plate: (a) without considering radiation, (b) with radiation, and (c) film cooling effectiveness

Grahic Jump Location
Fig. 3

Nondimensional temperature contours on hot side wall without coating and without radiation, with coating and without radiation, with coating and with radiation (a)–(c) for first and (d)–(f) for third corrugations

Grahic Jump Location
Fig. 4

Centerline nondimensional temperature along (a) L30–L80 centerline, (b) L0–L62 centerline for L30–L62–L80 configuration, variation of TBC effectiveness, overall effectiveness with TBC and overall effectiveness without TBC for (c) L30–L80 centerline, and (d) L62 centerline

Grahic Jump Location
Fig. 5

Variation of nondimensional temperature along L30–L80 centerline and L62 centerline (a) and (b) hot side metallic wall (c) and (d) coating, in offset of (a), temperature distribution is shown for investigated F/A ratio

Grahic Jump Location
Fig. 6

Variation of nondimensional temperature with cold side Mach number along (a) L30–L80 centerline, (b) L0–L62 centerline for L30–L62–L80 configuration for cold stream Mach number, Ma (c) Ma = 0.58, and (d) Ma = 0.3



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