Large Eddy Simulation of the E?ects of Plasma Actuation Strength on Film Cooling Efficiency

LI Guozhan(李国占); CHEN Fu(陈浮); LI Linxi(李林熙); SONG Yanping(宋彦萍)

doi:10.1088/1009-0630/18/11/08

Plasma Science and Technology > 2016 > 18(11): 1101-1109. > DOI: 10.1088/1009-0630/18/11/08

LI Guozhan(李国占), CHEN Fu(陈浮), LI Linxi(李林熙), SONG Yanping(宋彦萍). Large Eddy Simulation of the E?ects of Plasma Actuation Strength on Film Cooling Efficiency[J]. Plasma Science and Technology, 2016, 18(11): 1101-1109. DOI: 10.1088/1009-0630/18/11/08

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Large Eddy Simulation of the E?ects of Plasma Actuation Strength on Film Cooling Efficiency

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

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Received Date: December 20, 2015

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Abstract

Abstract

In this article, numerical investigation of the e?ects of di?erent plasma actuation strengths on the film cooling flow characteristics has been conducted using large eddy simulation (LES). For this numerical research, the plasma actuator is placed downstream of the trailing edge of the film cooling hole and a phenomenological model is employed to provide the electric field generated by it, resulting in the body forces. Our results show that as the plasma actuation strength grows larger, under the downward e?ect of the plasma actuation, the jet trajectory near the cooling hole stays closer to the wall and the recirculation region observably reduces in size. Meanwhile, the momentum injection e?ect of the plasma actuation also actively alters the distributions of the velocity components downstream of the cooling hole. Consequently, the influence of the plasma actuation strength on the Reynolds stress downstream of the cooling hole is remarkable. Furthermore, the plasma actuation weakens the strength of the kidney shaped vortex and prevents the jet from lifting o? the wall. Therefore, with the increase of the strength of the plasma actuation, the coolant core stays closer to the wall and tends to split into two distinct regions. So the centerline film cooling e?ciency is enhanced, and it is increased by 55% at most when the plasma actuation strength is 10.
- large eddy simulation,
- plasma actuation strength,
- film cooling,
- flow characteristic

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References

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