Sperotto de Quadros, Régis (2009)
Numerical Optimization of Boundary-Layer Control using Dielectric Barrier Discharge Plasma Actuators.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
A numerical investigation of active wave cancellation, using a plasma actuator in both continuous and pulsed operation modes, was carried out for a flat-plate boundary layer with an adverse pressure gradient at low Reynolds number. Pulsing was achieved by rectangular and sinusoidal modulation of the high-frequency plasma excitation voltage. A closed-loop control was developed and implemented using Large-Eddy Simulations into a CFD code (FASTEST). With this feed-back control algorithm it was found that the control can be limited to two operating parameters in order to significantly reduce Tollmien-Schlichting waves (TS-waves). The feed-back control algorithm was validated using two existing optimization methods which were also implemented in the code. The first method finds a local minimum of a function with several variables using a pattern search technique that compares function values at the three vertices of a triangle. The second method, known as the trust-region method, is based on quadratic models for derivative-free minimization. It was found that the developed feed-back control works efficiently and can be used to determine the optimum operating parameters of the plasma actuator for cancellation of TS-waves. The amplitude reduction of TS-waves is of interest since it allows for a delay of laminar-to-turbulent transition in the boundary layer, resulting in significant drag reduction.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2009 | ||||
Autor(en): | Sperotto de Quadros, Régis | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Numerical Optimization of Boundary-Layer Control using Dielectric Barrier Discharge Plasma Actuators | ||||
Sprache: | Englisch | ||||
Referenten: | Tropea, Dr.Ing Cameron | ||||
Publikationsjahr: | 27 Juli 2009 | ||||
Datum der mündlichen Prüfung: | 1 Juli 2009 | ||||
URL / URN: | urn:nbn:de:tuda-tuprints-18619 | ||||
Kurzbeschreibung (Abstract): | A numerical investigation of active wave cancellation, using a plasma actuator in both continuous and pulsed operation modes, was carried out for a flat-plate boundary layer with an adverse pressure gradient at low Reynolds number. Pulsing was achieved by rectangular and sinusoidal modulation of the high-frequency plasma excitation voltage. A closed-loop control was developed and implemented using Large-Eddy Simulations into a CFD code (FASTEST). With this feed-back control algorithm it was found that the control can be limited to two operating parameters in order to significantly reduce Tollmien-Schlichting waves (TS-waves). The feed-back control algorithm was validated using two existing optimization methods which were also implemented in the code. The first method finds a local minimum of a function with several variables using a pattern search technique that compares function values at the three vertices of a triangle. The second method, known as the trust-region method, is based on quadratic models for derivative-free minimization. It was found that the developed feed-back control works efficiently and can be used to determine the optimum operating parameters of the plasma actuator for cancellation of TS-waves. The amplitude reduction of TS-waves is of interest since it allows for a delay of laminar-to-turbulent transition in the boundary layer, resulting in significant drag reduction. |
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Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 500 Naturwissenschaften und Mathematik > 510 Mathematik |
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Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Strömungslehre und Aerodynamik (SLA) |
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Hinterlegungsdatum: | 28 Jul 2009 08:29 | ||||
Letzte Änderung: | 26 Aug 2018 21:25 | ||||
PPN: | |||||
Referenten: | Tropea, Dr.Ing Cameron | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 1 Juli 2009 | ||||
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