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Showing 1 to 14 of 14 for “"Plasma actuators"”.
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Characterization of flow control using programmable multi-directional plasma actuators
This research explores the use of a novel plasma actuator geometry and electrical configuration to generate directionally programmable flow fields near the surface of arrays of such plasma actuators. Plasma actuators are unique ionothrusters which are reliant on geometry to define flow …
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The attenuation of flow-induced tonal noise using plasma actuators
… low speed flows over cavities with and without plasma actuators were studied using experimental techniques. The acoustic and flow environments of open cavities with length-depth ratios of 0.5, 1.0, 2.0 and 3.0 have been investigated. Measurements using oil flow, particle imaging velocimetry, …
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Characterization of thermo-chemical properties of electric arc plasma actuators
Made available in DSpace on 2012-05-22T00:32:49Z (GMT). No. of bitstreams: 3 Sanders_Bradley.pdf: 3950226 bytes, checksum: 6d13168dd33011bda773e827fa05155e (MD5) Sanders_Bradley.docx: 27837244 bytes, checksum: bca4e05988b21491e4ef301725bb4666 (MD5) license.txt: 4065 bytes, checksum: …
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Active control of supersonic boundary layers using electric arc plasma actuators
… in terms of both efficiency and performance. Plasma actuators are a promising technology because they have no moving parts, fast response rates, and they can be forced at a wide range of frequencies. The two plasma actuators studied in this work are a Pulsed Plasma Jet (PPJ) and an array of …
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Fundamental physics and application of plasma actuators for high-speed flows
… detailed investigation is given discussing three plasma-based flow control methods. These methods included plasma generated by laser energy, microwaves, and electric arc. The plasma generated by laser energy was also applied to a sonic transverse jet in a supersonic cross flow. Lastly, the …
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Control of supersonic axisymmetric base flows using passive splitter plates and pulsed plasma actuators
… energy deposition from multiple electric-arc plasma discharges placed around the base. The flow-control authority of both methodologies was evaluated with experimental diagnostics including particle image velocimetry, schlieren photography, surface flow visualization, pressure-sensitive paint, …
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Active control of massively separated high-speed/base flows with electric arc plasma actuators
… to evaluate the effects of electric arc plasma actuators on high-speed separated flows. Two underlying goals motivated these experiments. The first goal was to provide a flow control technique that will result in enhanced flight performance for supersonic vehicles by altering the …
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Design of Optical Measurements for Plasma Actuators for the Validation of Quiescent and Flow Control Simulations
The concept of plasma flow control is a relatively new idea based on using atmospheric plasma placed near the edge of an air foil to reduce boundary layer losses. As with any new concept, it is important to be able to quantify theoretical assumptions with known experimental results for validation. …
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Computational analysis of plasma actuation for control of shock-laden flows in scramjet isolators
… that can have catastrophic consequences. Plasma actuation has emerged as a promising approach to mitigate these adverse effects due to its rapid response time and minimal mechanical complexity. This work investigates Quasi-DC (Q-DC) plasma actuators for active flow control in scramjet …
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An Investigation of the Irrotational Near Field of an Excited High Speed Jet.
… forcing with localized arc filament plasma actuators (LAFPAs). The well-defined actuation phase allows for the phase averaging of the near-field pressure in order to separate the relevant features of the response from the background turbulence. The resulting phase-averaged signal …
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Improvement In Acoustic Liner Attenuation In Turbofan Engines By Means Of Plasma Synthetic Jet Actuator
… are efficient attenuators of engine noise. Plasma actuators have been used as flow control devices in other settings and will now be studied as an enhancement for acoustic liners. A plasma actuator can excite oscillatory flow or a single direction (bias flow). Both flow types are studied as …
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On the turbulence-generated sound and control of compressible mixing layers
… of flow actuation by localized arc-filament plasma actuators. A validated numerical model of the actuator is devised and placed, as in corresponding experiments, in a cavity in the nozzle near its exit. A rapid Joule heating caused by the plasma is thought to be the root mechanism of flow …
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Diagnostic techniques for EHD and MHD interaction
The impact of plasma technologies is growing both in the academic and in the industrial fields. Nowadays, a great interest is focused in plasma applications in aeronautics and astronautics domains. Plasma actuators based on the Magneto-Hydro-Dynamic (MHD) and Electro- Hydro-Dynamic (EHD) …
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Plasma-coupled microcombustion
… of macro-scale (>mm) flames has shown that plasma coupling can be an effective method to stabilize and enhance combustion. The applicability of plasma in the particular case of micro-scale flames has yet to be investigated. In this dissertation, a multi-scale approach is used to build models …