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Research Papers

Numerical Investigation of Film Cooling Enhancement Using Staggered Row Mixed Hole Arrangements

[+] Author and Article Information
Prakhar Jindal

Department of Mechanical Engineering,
Birla Institute of Technology, Mesra,
Ranchi 835215, Jarkhand, India

Shubham Agarwal

Department of Mechanical Engineering,
Birla Institute of Technology, Mesra,
Ranchi 835215, Jarkhand, India
e-mail: 1994shubham.agarwal@gmail.com

R. P. Sharma

Professor
Department of Mechanical Engineering,
Birla Institute of Technology, Mesra,
Ranchi 835215, Jarkhand, India
e-mail: rpsharma@bitmesra.ac.in

A. K. Roy

Associate Professor
Department of Mechanical Engineering,
Birla Institute of Technology, Mesra,
Ranchi 835215, Jarkhand, India
e-mail: akroy@bitmesra.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 17, 2016; final manuscript received October 18, 2016; published online February 7, 2017. Assoc. Editor: Giulio Lorenzini.

J. Thermal Sci. Eng. Appl 9(2), 021007 (Feb 07, 2017) (9 pages) Paper No: TSEA-16-1070; doi: 10.1115/1.4035448 History: Received March 17, 2016; Revised October 18, 2016

The paper presents a novel study on film cooling effectiveness of a 3D flat plate with a multihole arrangement of mixed hole shapes. The film cooling arrangement consists of two rows of coolant holes, organized in a staggered pattern with an L/D (length to diameter ratio) of 10. The two rows consist of varied combinations of triangular and semi-elliptic shaped holes for the enhancement of film-cooling effectiveness. The results were obtained for a coolant to mainstream temperature ratio of 0.5 and a blowing ratio of 1.0. The computed flow temperature fields are presented in addition to the local two-dimensional streamwise and spanwise distribution of film cooling effectiveness. Validation of the results obtained from the turbulence model has been done with the experimental data of centerline film cooling effectiveness downstream of the cooling holes available in the open literature. The results showed the rapid merging of coolant jets emerging from front row of multiholes with the secondary staggered row of mixed holes. Due to the mainstream–coolant jet interaction, the strength of the counter rotating vortex pair was mitigated in the downstream region for certain arrangement of mixed hole shapes. The optimal hole combination with maximum overall effectiveness has been deduced from this study. The best configuration (M.R. VI) not only favored for the developed film, but also enhanced the averaged film cooling effectiveness to a large extent.

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References

Figures

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Fig. 1

Computational domain of the perforated plate for a single-hole configuration

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Fig. 2

Different mixed rows configurations on the flat plate in two-dimensional view

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Fig. 3

Grid dependency test for mixed hole rows arrangement

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Fig. 4

Validation of predicted centerline averaged effectiveness at M = 1.0

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Fig. 5

Film evolution from the cooling holes using streamlines

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Fig. 6

Adiabatic temperature distribution for: (a) single triangular and (b) semi-elliptic hole shape

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Fig. 7

Variation of coolant mass flow consumption for various configurations

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Fig. 8

Averaged centerline film cooling effectiveness for: (a) case I, (b), case II, and (c) case III

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Fig. 9

Comparison of averaged centerline film cooling effectiveness for M.R. II, IV, and VI arrangements

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Fig. 10

Spatially averaged film cooling effectiveness for: (a) case I, (b), case II, and (c) case III

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Fig. 11

Comparison of spatially averaged effectiveness for M.R. II, IV, and VI arrangements

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Fig. 12

Offset effectiveness values for all the mixed row arrangements

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Fig. 13

Spatially averaged effectiveness for all the mixed row arrangements

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Fig. 14

Velocity Streamlines on a cross plane in flow domain

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Fig. 15

Temperature distributions for the (a) M.R. II, (b) M.R. IV, and (c) M.R. VI arrangements

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