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Research Papers: Heat and Mass Transfer

Large Eddy Simulation of the Elliptic Jets in Film Cooling Controlled by Dielectric Barrier Discharge Plasma Actuators With an Improved Model

[+] Author and Article Information
Jianyang Yu, Cong Wang

School of Astronautics,
Harbin Institute of Technology,
Harbin 150001, China

Zhao Wang

School of Energy Science and Technology,
Harbin Institute of Technology,
Harbin 150001, China

Fu Chen

Beijing Institute of Astronautical
Systems Engineering,
Harbin Institute of Technology,
Harbin 150001, China

Guojun Yan

School of Energy Science and Technology,
Beijing Institute of Astronautical
Systems Engineering,
Beijing 10071, China

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 9, 2018; final manuscript received August 5, 2018; published online October 1, 2018. Assoc. Editor: Milind A. Jog.

J. Heat Transfer 140(12), 122001 (Oct 01, 2018) (10 pages) Paper No: HT-18-1216; doi: 10.1115/1.4041186 History: Received April 09, 2018; Revised August 05, 2018

The dielectric barrier discharge (DBD) plasma actuator, in which electrodes are asymmetric arranged, has already demonstrated its ability in flow control. In the present work, the configuration of DBD plasma actuator defined as DBD-vortex generator (VGs), which can induce streamwise vortices, has been employed in the flow control of the inclined jet in crossflow. The coherent turbulent structures around the cooling hole are examined by the large eddy simulation (LES) method with the improved plasma model. The mechanism of coherent structure controlled by the DBD-VGs is also elucidated in the processes of parametric study with the actuation conditions. The calculation results show that the DBD-VGs provides us an effective approach to further enhance the performance of the film cooling. When it is applied into the flow, symmetrical streamwise vortices are induced to break down the coherent vortex structure, leading to more coolant gathered on the surface, especially at the lateral area of the coolant jet. What is more, an overall improvement of the film cooling performance can be obtained when the actuation strength is strong enough.

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References

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Figures

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Fig. 1

Schematic of the DBD plasma aerodynamic actuator

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Fig. 2

Configurations of the DBD plasma actuators: (a) typical, (b) DBD-VGs, and (c) anti-vortex pair generated by the DBD-VGs

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Fig. 3

The computational domain of the film cooling

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Fig. 4

Grid system and grid-independent study: (a) the schematic of the grid system and (b) film cooling efficiency of different grid systems

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Fig. 5

Plasma actuators arrangement scheme and electric field configuration

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Fig. 6

Velocity distribution after and before identification

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Fig. 7

Coherent structures identified around the jet orifice

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Fig. 8

The streamlines of coolant and the crossflow when M = 1.0 without plasma actuation

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Fig. 9

Close-up view of the CRVP at x = 0

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Fig. 10

Temperature displayed in cross planes downstream the jet orifice

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Fig. 11

The unsteady dynamics of coherent structures with the effect of the DBD-VGs

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Fig. 12

Temperature in various cross planes downstream the jet orifice

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Fig. 13

Film cooling efficiency on the test surface

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Fig. 14

Locations of the survey planes on the test surface

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Fig. 15

The film cooling effectiveness at the various spanwise locations with the same Dc = 5: (a) centerline and (b) z = −0.5d

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Fig. 16

The film cooling effectiveness at the various streamwise locations with the same Dc = 5: (a) x = 1.5d and (b) x =3.0d

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Fig. 17

The film cooling effectiveness at the various spanwise locations with the same Dc = 5: (a) centerline and (b) z = −0.5d

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Fig. 18

The film cooling effectiveness at the various streamwise locations with the same S = d: (a) x =1.5d, (b) x =3.0d, (c) x =5.0d, and (d) x =8.0d

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Fig. 19

Temperature in various cross planes downstream the jet orifice in case 7

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Fig. 20

Coherent structures in case 7

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