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Research Papers

Interaction of Flow and Film-Cooling Effectiveness Between Double-Jet Film-Cooling Holes With Various Spanwise Distances

[+] Author and Article Information
Jiaxu Yao, Jin Xu, Ke Zhang

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an 710049, Shaanxi, China

Jiang Lei

State Key Laboratory for Strength and
Vibration of Mechanical Structures,
Xi'an Jiaotong University,
Xi'an 710049, Shaanxi, China
e-mail: leijiang@mail.xjtu.edu.cn

Lesley M. Wright

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

1Corresponding author.

2Present address: Turbine Heat Transfer Laboratory, Department of Mechanical Engineering,Texas A&M University, College Station, TX 77843-3123.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received May 31, 2018; final manuscript received October 18, 2018; published online November 28, 2018. Editor: Kenneth Hall.

J. Turbomach 140(12), 121011 (Nov 28, 2018) (8 pages) Paper No: TURBO-18-1118; doi: 10.1115/1.4041809 History: Received May 31, 2018; Revised October 18, 2018

The interaction of flow and film-cooling effectiveness between jets of double-jet film-cooling (DJFC) holes on a flat plate is studied experimentally. The time-averaged flow field in several axial positions (X/d = −2.0, 1.0, and 5.0) is obtained through a seven-hole probe. The downstream film-cooling effectiveness on the flat plate is measured by pressure sensitive paint (PSP). The inclination angle (θ) of all the holes is 35 deg, and the compound angle (β) is ±45 deg. Effects of the spanwise distance (p = 0, 0.5d, 1.0d, 1.5d, and 2.0d) between the two interacting jets of DJFC holes are studied, while the streamwise distance (s) is kept as 3d. The blowing ratio (M) varies as 0.5, 1.0, 1.5, and 2.0. The density ratio (DR) is maintained at 1.0. Results show that the interaction between the two jets of DJFC holes has different effects at different spanwise distances. For a small spanwise distance (p/d = 0), the interaction between the jets presents a pressing effect. The downstream jet is pressed down and kept attached to the surface by the upstream one. The effectiveness is not sensitive to blowing ratios. For mid-spanwise distances (p/d = 0.5 and 1.0), the antikidney vortex pair dominates the interaction and pushes both of the jets down, thus leading to better coolant coverage and higher effectiveness. As the spanwise distance becomes larger (p/d ≥ 1.5), the pressing effect almost disappears, and the antikidney vortex pair effect is weaker. The jets separate from each other and the coolant coverage decreases. At a higher blowing ratio, the interaction between the jets of DJFC holes happens later.

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References

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Figures

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Fig. 1

Schematic of the experiment setup (the plenum has two entrances at opposing sides, but only one can be seen here): 1—test section, 2—S-CMOS camera, 3—LED lamp, 4—seven hole probe, 5—traversing system, 6—flat plate, 7—rotameter, 8—heater, 9—foreign gas bottle, 10—cooler & drier, 11—air compressor, and 12—plenum

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Fig. 2

Double-jet film-cooling holes geometry and coordinates

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Fig. 3

Pressure sensitive paint calibration curve

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Fig. 4

Mainstream boundary layer velocity profile

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Fig. 5

Film-cooling effectiveness results compared with open literature (a) streamwise cylindrical holes, centerline, (b) streamwise cylindrical holes, laterally averaged, and (c) DJFC holes, p/d = 1.0, laterally averaged

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Fig. 6

Flow field results at blowing ratio M = 0.5 (a) velocity and (b) vorticity

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Fig. 7

Flow field results at blowing ratio M = 1.5 (a) velocity and (b) vorticity

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Fig. 8

Film-cooling effectiveness distribution at different blowing ratios

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Fig. 9

Laterally averaged film-cooling effectiveness at different blowing ratios

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