Self-adaptive closed-loop control of low-reynolds number laminar separation

A. Gross, Hermann F Fasel

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Closed-loop control of laminar separation was investigated numerically for a low-pressure turbine blade and an airfoil at relatively low operating Reynolds-numbers. Open-loop investigations show that within a certain frequency range disturbances are amplified. This can be exploited for making the control more effective. The amplification is attributed to a hydrodynamic instability of the base flow. A simple closed-loop controller, where a downstream pressure signal is fed back to an upstream actuator, is shown to be as effective as an optimized open-loop controller. The simple closed-loop controller can be improved by continuously adjusting the controller parameters during the run time of the simulation using a minimization algorithm that minimizes a desired objective such as drag over lift and control effort. This allows for an optimization of the gain and phase of the feedback resulting in a better "synchronization" or coupling of the actuation and the flow dynamics.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - AIAA Applied Aerodynamics Conference
Pages303-314
Number of pages12
Volume1
StatePublished - 2007
Event25th AIAA Applied Aerodynamics Conference, 2007 - Miami, FL, United States
Duration: Jun 25 2007Jun 28 2007

Other

Other25th AIAA Applied Aerodynamics Conference, 2007
CountryUnited States
CityMiami, FL
Period6/25/076/28/07

Fingerprint

Reynolds number
Controllers
Airfoils
Turbomachine blades
Amplification
Drag
Synchronization
Turbines
Actuators
Hydrodynamics
Feedback

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Gross, A., & Fasel, H. F. (2007). Self-adaptive closed-loop control of low-reynolds number laminar separation. In Collection of Technical Papers - AIAA Applied Aerodynamics Conference (Vol. 1, pp. 303-314)

Self-adaptive closed-loop control of low-reynolds number laminar separation. / Gross, A.; Fasel, Hermann F.

Collection of Technical Papers - AIAA Applied Aerodynamics Conference. Vol. 1 2007. p. 303-314.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gross, A & Fasel, HF 2007, Self-adaptive closed-loop control of low-reynolds number laminar separation. in Collection of Technical Papers - AIAA Applied Aerodynamics Conference. vol. 1, pp. 303-314, 25th AIAA Applied Aerodynamics Conference, 2007, Miami, FL, United States, 6/25/07.
Gross A, Fasel HF. Self-adaptive closed-loop control of low-reynolds number laminar separation. In Collection of Technical Papers - AIAA Applied Aerodynamics Conference. Vol. 1. 2007. p. 303-314
Gross, A. ; Fasel, Hermann F. / Self-adaptive closed-loop control of low-reynolds number laminar separation. Collection of Technical Papers - AIAA Applied Aerodynamics Conference. Vol. 1 2007. pp. 303-314
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