Research Papers

Enhancement of Film Cooling Effectiveness Using Rectangular Winglet Pair

[+] Author and Article Information
Prakhar Jindal

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

Shubham Agarwal

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

R. P. Sharma

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

A. K. Roy

Department of Mechanical Engineering,
Birla Institute of Technology, Mesra,
Ranchi 835215, 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 May 5, 2016; final manuscript received February 16, 2018; published online May 8, 2018. Editor: S. A. Sherif.

J. Thermal Sci. Eng. Appl 10(4), 041014 (May 08, 2018) (9 pages) Paper No: TSEA-16-1118; doi: 10.1115/1.4039700 History: Received May 05, 2016; Revised February 16, 2018

This study deals with the film cooling enhancement in a combustion chamber by the use of rectangular winglet vortex generators (VGs). Rectangular winglet pair (RWP) in both the common-flow up and the common-flow down configuration is installed upstream of a coolant injection hole on the lower chamber wall. A three-dimensional numerical approach with complete solution of Navier–Stokes (NS) equations closed by the k–ɛ turbulence model is used for analyzing the effect of VG installation on film cooling effectiveness enhancement. The effect of RWP orientation is investigated to deduce the best configuration which is then optimized in terms of its geometrical parameters including its upstream distance from the hole and the angle it makes with the incoming flow. Results obtained show that a RWP located upstream of the coolant hole in common-flow down configuration gives the best effectiveness enhancement with certain other geometrical parameters specified. A novel “mushroom” adiabatic distribution scheme for film cooling effectiveness and temperature has been discussed in the paper. This characteristic scheme is developed as a result of RWPs' vortices interaction with the coolant inlet jet and the hot mainstream flow. A detailed discussion of the mechanisms and the flow field properties underlying the effectiveness enhancement and other phenomenon observed has also been presented in the paper.

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Fig. 1

Schematic diagram of computational domain with RWP

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Fig. 2

Different configurations and arrangement of RWPs

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Fig. 3

Grid sensitivity study with different mesh sizes

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Fig. 4

Validation of the model used with open literature experimental data

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Fig. 5

Film cooling effectiveness with and without RWPs

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Fig. 6

Pressure variation across the lower wall for all cases

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Fig. 7

Temperature contours on the lower surface of the combustion chamber

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Fig. 8

Flow vorticity induced by the RWPs at different cross plane locations

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Fig. 9

Temperature contours on a cross-plane downstream of the location of coolant jet

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Fig. 10

Flow streamlines depicting the encounter and interaction of coolant flow with RWPs

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Fig. 11

z-velocity profile along the height of domain in z-direction as a representation of coolant jet height

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Fig. 12

Adiabatic effectiveness distribution along the centerline for RWP at different location with: (a) CF-Down RWP and (b) CF-Up RWP

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Fig. 13

Adiabatic effectiveness contours aft the coolant injection on cross planes for different RWPs

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Fig. 14

Temperature contours on the lower wall at different locations of RWPs

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Fig. 15

Effectiveness contours on three different downstream locations of cross planes for CF-Down RWP

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Fig. 16

Film cooling effectiveness at different angles of CF-Down RWP




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