Characteristics of Partial Length Circular Pin Fins As Heat Transfer Augmentors for Airfoil Internal Cooling Passages

Arora, Sahil; Abdel-Messeh, W.

doi:10.1115/1.2927694

Cited by 16 publications

(4 citation statements)

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“…It has been demonstrated by various authors [23,24] that cylinders with streamline-shaped crosssection have much less flow resistance than circular ones, while they have about the same behavior in terms of heat transfer. The work in [10] also investigated the partial length circular pin fin concept and found that both the array averaged-heat transfer and friction factor decrease with increasing gap distance.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Innovative Internal Trailing Edge Cooling Configurations with Pentagonal Arrangement and Elliptic Pin Fin

Tarchi

Facchini

Zecchi³

2008

International Journal of Rotating Machinery

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This paper describes a heat transfer experimental study of four different internal trailing edge cooling configurations based on pin fin schemes. The aim of the study is the comparison between innovative configurations and standard ones. So, a circular pin fin configuration with an innovative pentagonal scheme is compared to a standard staggered scheme, while two elliptic pin fin configurations are compared to each other turning the ellipse from the streamwise to the spanwise direction. For each configuration, heat transfer and pressure loss measurements were made keeping the Mach number fixed at 0.3 and varying the Reynolds number from 9000 to 27000. In order to investigate the overall behavior of both endwall and pedestals, heat transfer measurements are performed using a combined transient technique. Over the endwall surface, the classic transient technique with thermochromic liquid crystals allows the measurement of a detailed heat transfer coefficient (HTC) map. Pin fins are made of high thermal conductivity material, and an inverse data reduction method based on a finite element code allows to evaluate the mean HTC of each pin fin. Results show that the pentagonal arrangement generates a nonuniform HTC distribution over the endwall surface, while, in terms of average values, it is equivalent to the staggered configuration. On the contrary, the HTC map of the two elliptic configurations is similar, but the spanwise arrangement generates higher heat transfer coefficients and pressure losses.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Innovative Internal Trailing Edge Cooling Configurations with Pentagonal Arrangement and Elliptic Pin Fin

Tarchi

Facchini

Zecchi³

2008

International Journal of Rotating Machinery

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“…Chyu [9] showed that pin fin fillets reduce heat transfer as compared to the nonfillet case. Arora and Abdel-Messeh [10] investigated the effects of partial length pin fins, as well. Another consideration involves the importance of maintaining heat transfer capacity deeper into an array of pin fins.…”

Section: Previous Studiesmentioning

confidence: 99%

Comparison of Pin Surface Heat Transfer in Arrays of Oblong and Cylindrical Pin Fins

Kirsch

Ostanek

Thole

2013

Volume 3A: Heat Transfer

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Pin fin arrays are most commonly used to promote convective cooling within the internal passages of gas turbine airfoils. Contributing to the heat transfer are the surfaces of the channel walls as well as the pin itself. Generally the pin fin cross-section is circular; however, certain applications benefit from using other shapes such as oblong pin fins. The current study focuses on characterizing the heat transfer distribution on the surface of oblong pin fins with a particular focus on pin spacing effects. Comparisons were made with circular cylindrical pin fins, where both oblong and circular cylindrical pins had a height-to-diameter ratio of unity, with both streamwise and spanwise spacing varying between two and three diameters. To determine the effect of relative pin placement, measurements were taken in the first of a single row and in the third row of a multi-row array. Results showed that area-averaged heat transfer on the pin surface was between 30 and 35 percent lower for oblong pins in comparison to cylindrical. While heat transfer on the circular cylindrical pin experienced one minimum prior to boundary layer separation, heat transfer on the oblong pin-fins experienced two minimums, where one is located before the boundary layer transitions to a turbulent boundary layer and the other prior to separation at the trailing edge.

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“…A comparison of the various heat transfer augmentation techniques used in internal coolant passages, including pin fins, was performed by Ligrani et al [10]. Different pin fin shapes and concepts have been studied as alternatives to circular fins, for example, cube-and diamond-shaped pin fins [6], elliptical pin fins [21] and partial pins [2,5].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of half pins on the heat-transfer coefficient was studied by Arora and Abdel-Messeh [2]. The friction factor for different geometries of partial pins is lower for partial pins compared to full-length pins.…”

Section: Introductionmentioning

confidence: 99%

Lower pressure drop turbine blade trailing-edge cooling configuration

Carosio

Mendonça

2014

J Braz. Soc. Mech. Sci. Eng.

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Numerical results for a proposed turbine blade trailing-edge cooling configuration are presented. This proposed configuration is meant to result in the same or higher heat transfer performance but with a reduced pressure drop through the passage. The most common trailingedge cooling configuration is composed of circular pin fin which increases heat transfer due to increased turbulence levels. The configuration proposed in the present investigation is based on short flat plate fins and the heat transfer enhancement is based on the constant restart of a laminar boundary layer over the staggered plates arrangement. This arrangement will produce less turbulence and therefore lower pressure drop. The number of plates necessary to result in the same level of heat transfer as the circular pin fins is determined and the pressure losses between the two configurations are compared. The proposed configuration results in reduced losses and lower cooling air pumping power.

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Characteristics of Partial Length Circular Pin Fins As Heat Transfer Augmentors for Airfoil Internal Cooling Passages

Cited by 16 publications

References 0 publications

Experimental Investigation of Innovative Internal Trailing Edge Cooling Configurations with Pentagonal Arrangement and Elliptic Pin Fin

Experimental Investigation of Innovative Internal Trailing Edge Cooling Configurations with Pentagonal Arrangement and Elliptic Pin Fin

Comparison of Pin Surface Heat Transfer in Arrays of Oblong and Cylindrical Pin Fins

Lower pressure drop turbine blade trailing-edge cooling configuration

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