Large Eddy Simulation of the Elliptic Jets in Film Cooling Controlled by DBD Plasma Actuators with an Improved Model

[+] Author and Article Information
Jianyang Yu

Harbin Institute of Technology, Harbin 150001, China

Zhao Wang

Harbin Institute of Technology, Harbin 150001, China

Fu Chen

Harbin Institute of Technology, Harbin 150001, China

Guojun Yan

Beijing Institute of Astronautical Systems Engineering, Beijing, 10071, China

Cong Wang

Harbin Institute of Technology, Harbin 150001, China

1Corresponding author.

ASME 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-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's more, an overall improvement of the film cooling performance can be obtained when the actuation strength is strong enough.

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