Plasma channel flows: Electro-fluid dynamic jets

Campbell, Nicholas S.; Roy, Subrata

doi:10.1063/1.4897341

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…This increase in pressure is balanced by the decrease in pressure before the trailing edge which implies enhanced mixing. The applied body force generates a wall jet of 5 m s −1 in quiescent conditions inside the channel which is reasonable considering recently reported experiments of plasma channel flows [8,9]. This strongly suggests that only a small momentum is required to alter the pressure in the channel.…”

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confidence: 86%

Noise control of subsonic cavity flows using plasma actuated receptive channels

Gupta¹,

Roy²

2014

J. Phys. D: Appl. Phys.

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We introduce a passive receptive rectangular channel at the trailing edge of an open rectangular cavity to reduce the acoustic tones generated due to coherent shear layer impingement. The channel is numerically tested at Mach 0.3 using an unsteady three-dimensional large eddy simulation. Results show reduction in pressure fluctuations in the cavity due to which sound pressure levels are suppressed. Two linear dielectric barrier discharge plasma actuators are placed inside the channel to enhance the flow through it. Specifically, acoustic suppression of 7 dB was obtained for Mach 0.3 flow with the plasma actuated channel. Also, the drag coefficient for the cavity reduced by over three folds for the channel and over eight folds for the plasma actuated channel. Such a channel can be useful in noise and drag reduction for various applications, including weapons bay, landing gear and branched piping systems.

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confidence: 86%

Noise control of subsonic cavity flows using plasma actuated receptive channels

Gupta¹,

Roy²

2014

J. Phys. D: Appl. Phys.

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“…However, positive ionic flow with a stronger peak near the center causes less viscous penalty than negative ionic flow adhering to the plate electrodes resulting in higher energy conversion efficiency for positive signal. Combining these characters, the electro-mechanical energy conversion efficiency of such devices can reach 2.8%, almost equal to 4 times that of wire DBD channels 11 or 3 times that of wire corona channels. 3 Some entrainment effect was also observed during the study.…”

Section: ððmentioning

confidence: 99%

“…2,3 This is due to a combination of weak plasma generation near the wire and an excessive viscous loss from the thin wall shear layer. In contrast, the channel configuration 11 with sharp needle electrode might be employed to enhance the ion generation near the needle tip and minimize the viscous loss from flow induced by plasma body force.…”

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confidence: 99%

Efficient needle plasma actuators for flow control and surface cooling

Zhao

Portugal

Roy

2015

Applied Physics Letters

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We introduce a milliwatt class needle actuator suitable for plasma channels, vortex generation, and surface cooling. Electrode configurations tested for a channel configuration show 1400% and 300% increase in energy conversion efficiency as compared to conventional surface and channel corona actuators, respectively, generating up to 3.4 m/s air jet across the channel outlet. The positive polarity of the needle is shown to have a beneficial effect on actuator efficiency. Needle-plate configuration is demonstrated for improving cooling of a flat surface with a 57% increase in convective heat transfer coefficient. Vortex generation by selective input signal manipulation is also demonstrated.

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“…A plasma pump can be created by placing plasma actuators inside a channel. The actuator can consist of plate electrodes, 4 wire electrodes, 5,6 or needle electrodes. 7 The advantages of producing a fluid flow in this manner include low power consumption, instantaneous response, and a lack of moving parts.…”

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confidence: 99%

Numerical study of low pressure air plasma in an actuated channel

Houba

Roy

2015

Journal of Applied Physics

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A model for air plasma discharge based on drift-diffusion with local mean energy approximation is described. The model consists of 7 species and 18 reactions. The code is benchmarked with experimental and numerical results for low pressure glow discharge in a cylindrical tube. The code is used to simulate the discharge produced by a wire placed in a rectangular channel with grounded electrodes at the top and bottom walls. The discharge is concentrated near the wire. The actuator acts on the neutral gas through a body force and Joule heating. Around 80%-90% of the electrical power is converted to Joule heating of the neutral gas and the wall. The actuator produces a body force on the order of 0.1 mN/m. The effectiveness of the actuator increases from 100 to 300 V, and plateaus from 300 to 600 V. The results of the study suggest a further exploration of the channel concept. V

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Plasma channel flows: Electro-fluid dynamic jets

Cited by 11 publications

References 6 publications

Noise control of subsonic cavity flows using plasma actuated receptive channels

Noise control of subsonic cavity flows using plasma actuated receptive channels

Efficient needle plasma actuators for flow control and surface cooling

Numerical study of low pressure air plasma in an actuated channel

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