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Research Papers

Impingement Heat Transfer Enhancement on a Cylindrical, Leading Edge Model With Varying Jet Temperatures

[+] Author and Article Information
Lesley M. Wright

e-mail: Lesley_Wright@Baylor.edu
Department of Mechanical Engineering,
Baylor University,
Waco, TX 76798-7356

Daniel C. Crites

Honeywell Aerospace,
Phoenix, AZ 85034

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the Journal of Turbomachinery. Manuscript received June 29, 2012; final manuscript received August 17, 2012; published online March 25, 2013. Editor: David Wisler.

J. Turbomach 135(3), 031021 (Mar 25, 2013) (8 pages) Paper No: TURBO-12-1105; doi: 10.1115/1.4007529 History: Received June 29, 2012; Revised August 17, 2012

Stagnation region heat transfer coefficients are obtained from jet impingement onto a concave surface in this experimental investigation. A single row of round jets impinge on the cylindrical target surface to replicate leading edge cooling in a gas turbine airfoil. A modified, transient lumped capacitance experimental technique was developed (and validated) to obtain stagnation region Nusselt numbers with jet-to-target surface temperature differences ranging from 60 °F (33.3 °C) to 400 °F (222.2 °C). In addition to varying jet temperatures, the jet Reynolds number (5000–20,000), jet-to-jet spacing (s/d = 2–8), jet-to-target surface spacing (ℓ/d = 2–8), and impingement surface diameter-to-jet diameter (D/d = 3.6, 5.5) were independently varied. This parametric investigation has served to develop and validate a new experimental technique, which can be used for investigations involving large temperature differences between the surface and fluid. Furthermore, the study has broadened the range of existing correlations currently used to predict heat transfer coefficients for leading edge jet impingement.

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References

Figures

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Fig. 1

Diagram of flow path and experimental facility

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Fig. 2

(a) Layout of target surface and plenum. (b) Dimensioned jet plates in inches (meters).

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Fig. 3

Model of impingement surface with aluminum plates

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Fig. 4

Corrected and uncorrected stagnation Nusselt numbers through time

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Fig. 5

Effect of ℓ/d at varying s/d (versus Rejet)

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Fig. 6

Effect of s/d at varying ℓ/d (versus Rejet)

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Fig. 7

Effect of s/d at varying Rejet (versus ℓ/d)

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Fig. 8

Effect of Rejet at varying s/d (versus ℓ/d)

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Fig. 9

Effect of D/d at varying ℓ/d (versus Rejet)

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