Simon, Bernhard Jochen (2017)
Active Cancellation of Tollmien-Schlichting Waves under Varying Inflow Conditions for In-Flight Application.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
Active flow control in laminar boundary layers can reduce wall friction on a wing, if laminar-turbulent transition is delayed. In this thesis, (re-)active flow control for active cancellation of Tollmien-Schlichting (TS) waves in a two-dimensional laminar boundary layer is investigated. The TS-waves that initiate the transition to turbulence are attenuated with a DBD plasma actuator by superposition.
Active wave cancelation requires the use of control algorithms and their stability is influenced by variable inflow conditions. Model-based (Linear-Quadratic-Gaussian) and adaptive control algorithms (filtered-x-LMS) are investigated under realistic (varying) inflow conditions in wind-tunnel and in-flight experiments. The further developed delayed-x-LMS algorithm allows a stable and robust controller operation for active wave cancelation in flight. All experimental results are validated by direct numerical simulations and linear stability theory.
Furthermore, the challenges for the application of DBD plasma actuator arrays to delay natural transition are pointed out. The simplification of transfer paths for reducing the required computational power is discussed.
| Typ des Eintrags: | Dissertation | ||||
|---|---|---|---|---|---|
| Erschienen: | 2017 | ||||
| Autor(en): | Simon, Bernhard Jochen | ||||
| Art des Eintrags: | Erstveröffentlichung | ||||
| Titel: | Active Cancellation of Tollmien-Schlichting Waves under Varying Inflow Conditions for In-Flight Application | ||||
| Sprache: | Englisch | ||||
| Referenten: | Tropea, Prof. Dr. Cameron ; Grundmann, Prof. Dr. Sven ; Henningson, Prof. Dr. Dan | ||||
| Publikationsjahr: | 2017 | ||||
| Ort: | Darmstadt | ||||
| Datum der mündlichen Prüfung: | 27 Juni 2017 | ||||
| URL / URN: | http://tuprints.ulb.tu-darmstadt.de/6161 | ||||
| Kurzbeschreibung (Abstract): | Active flow control in laminar boundary layers can reduce wall friction on a wing, if laminar-turbulent transition is delayed. In this thesis, (re-)active flow control for active cancellation of Tollmien-Schlichting (TS) waves in a two-dimensional laminar boundary layer is investigated. The TS-waves that initiate the transition to turbulence are attenuated with a DBD plasma actuator by superposition. Active wave cancelation requires the use of control algorithms and their stability is influenced by variable inflow conditions. Model-based (Linear-Quadratic-Gaussian) and adaptive control algorithms (filtered-x-LMS) are investigated under realistic (varying) inflow conditions in wind-tunnel and in-flight experiments. The further developed delayed-x-LMS algorithm allows a stable and robust controller operation for active wave cancelation in flight. All experimental results are validated by direct numerical simulations and linear stability theory. Furthermore, the challenges for the application of DBD plasma actuator arrays to delay natural transition are pointed out. The simplification of transfer paths for reducing the required computational power is discussed. |
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| URN: | urn:nbn:de:tuda-tuprints-61614 | ||||
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau |
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| Fachbereich(e)/-gebiet(e): | 16 Fachbereich Maschinenbau 16 Fachbereich Maschinenbau > Fachgebiet Strömungslehre und Aerodynamik (SLA) 16 Fachbereich Maschinenbau > Fachgebiet Strömungslehre und Aerodynamik (SLA) > Strömungskontrolle und instationäre Aerodynamik |
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| Hinterlegungsdatum: | 16 Jul 2017 19:55 | ||||
| Letzte Änderung: | 16 Jul 2017 19:55 | ||||
| PPN: | |||||
| Referenten: | Tropea, Prof. Dr. Cameron ; Grundmann, Prof. Dr. Sven ; Henningson, Prof. Dr. Dan | ||||
| Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 27 Juni 2017 | ||||
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| Suche nach Titel in: | TUfind oder in Google | ||||
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