Flexible hot-film anemometer arrays on curved structures for active flow control on airplane wings

Schwerter, Martin; Beutel, Tobias; Leester-Schädel, Monika; Büttgenbach, S.; Dietzel, Andreas

doi:10.1007/s00542-013-2054-y

Cited by 17 publications

(13 citation statements)

References 10 publications

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“…The sensor's substrate is fabricated using liquid spin-on polyimide, enabling a sensor thickness of down to 7 μm. The hot-film elements are made of nickel because of its high-temperature coefficient of resistance [13]. Figure 6 shows a fabricated hot-film sensor array on 20 μmthick polyimide foil.…”

Section: Measurement Principlesmentioning

confidence: 99%

“…This also includes the water reliability, which is necessary for water-tunnel experiments. In tests with spun-on polyimide for covering the hot-film sensor array, only 2 of 20 sensors were damaged after two months of operation in water, even though the sensors were heated frequently [13]. The polyimide covering, combined with an additional diffusion-barrier layer, will be used for both sensors.…”

Section: Measurement Principlesmentioning

confidence: 99%

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Design of a high-lift experiment in water including active flow control

Beutel

Sattler

Sayed

et al. 2014

Smart Mater. Struct.

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This paper describes the structural design of an active flow-control experiment. The aim of the experiment is to investigate the increase in efficiency of an internally blown Coanda flap using unsteady blowing. The system uses tailor-made microelectromechanical (MEMS) pressure sensors to determine the state of the oncoming flow and an actuated lip to regulate the mass flow and velocity of a stream near a wall over the internally blown flap. Sensors and actuators are integrated into a highly loaded system that is extremely compact. The sensors are connected to a bus system that feeds the data into a real-time control system. The piezoelectric actuators using the d 33 effect at a comparable low voltage of 120 V are integrated into a lip that controls the blowout slot height. The system is designed for closed-loop control that efficiently avoids flow separation on the Coanda flap. The setup is designed for water-tunnel experiments in order to reduce the free-stream velocity and the system's control frequency by a factor of 10 compared with that in air. This paper outlines the function and verification of the system's main components and their development.

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Section: Measurement Principlesmentioning

confidence: 99%

Section: Measurement Principlesmentioning

confidence: 99%

Design of a high-lift experiment in water including active flow control

Beutel

Sattler

Sayed

et al. 2014

Smart Mater. Struct.

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“…Micromechanical anemometers have most recently been employed to monitor superfluidic turbulence [15], Karmen vortices [16] and for active flow control in aeronautics [17]. Hotwire anemometers use an electrically heated wire to monitor fluid velocity.…”

Section: Introductionmentioning

confidence: 99%

Planarised optical fiber composite using flame hydrolysis deposition demonstrating an integrated FBG anemometer

Holmes¹,

Gates²,

Smith³

2014

Opt. Express

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This paper reports for the first time a planarised optical fiber composite formed using Flame Hydrolysis Deposition (FHD). As a way of format demonstration a Micro-Opto-Electro-Mechanical (MOEMS) hot wire anemometer is formed using micro-fabrication processing. The planarised device is rigidly secured to a silicon wafer using optical quality doped silica that has been deposited using flame hydrolysis and consolidated at high temperature. The resulting structure can withstand temperatures exceeding 580K and is sensitive enough to resolve free and forced convection interactions at low fluid velocity.

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“… Thin sensors with a non-flow-affecting thickness: These may for example be flexible foils with hot film microsensors as described in [2].…”

Section: Introductionmentioning

confidence: 99%

MEMS pressure sensors embedded into fiber composite airfoils

Schwerter

Leester-Schädel

Büttgenbach

et al. 2014

IEEE SENSORS 2014 Proceedings

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The paper describes the integration of pressure sensors into fiber composite in order to obtain flow sensing airfoils to be used in future aircrafts. First, the sensor design and working principle is described, followed by an embedding procedure for damage-free integration. Here the sensors are faced to stresses by vacuum and curing during the embedding process into fiber-reinforced plastic. The mechanical characteristics and the influence of external mechanical stresses on the integrated sensor are further investigated. Finally, a sensor design unsusceptible to external mechanical stresses parallel to the surface of the airfoil is proposed and verified by tensile stress tests.

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Flexible hot-film anemometer arrays on curved structures for active flow control on airplane wings

Cited by 17 publications

References 10 publications

Design of a high-lift experiment in water including active flow control

Design of a high-lift experiment in water including active flow control

Planarised optical fiber composite using flame hydrolysis deposition demonstrating an integrated FBG anemometer

MEMS pressure sensors embedded into fiber composite airfoils

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