Magnetically Actuated Microvalves for Active Flow Control

Ducloux, O.; Deblock, Y.; Talbi, Abdelkrim; Gimeno, L.; Tiercelin, Nicolas; Pernod, Philippe; Preobrazhensky, V.; Merlen, Alain

doi:10.1007/978-1-4020-6858-4_7

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…In contrast, a low number of satisfactory MEMS actuators, and more precisely fluidic actuators, are available. Only a few MEMS pulsedjet actuator examples showing promising performances for flow control applications have been reported [4]: the French startup FLOWDIT's electrostatic guillotine microvalve [5], the Besançon University laboratory FEMTO-ST's 'Zip' electrostatic actuator [6], the BAE Systems piezoelectric micro-valve [7], and IEMN/LEMAC electromagnetic pulsed microjets [4,[8][9][10]. In contrast, synthetic jets based on MEMS technologies [11][12][13][14] do not present satisfactory performances for flow control applications, essentially because of a deficit of velocity due to a very small variation of the cavity volume.…”

Section: Introductionmentioning

confidence: 99%

Synthetic jets based on micro magneto mechanical systems for aerodynamic flow control

Gimeno¹,

Talbi²,

Viard³

et al. 2010

J. Micromech. Microeng.

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A magneto-mechanical micro-actuator providing an axisymmetric synthetic microjet for active flow control was designed, fabricated and characterized. The micro-actuator consists of an enclosed cavity with a small orifice in one face and a high flexible elastomeric (PDMS) membrane in the opposite one. The membrane vibration is achieved using a magnetic actuation chosen for its capacity for providing large out of plane displacements and forces necessary for the performances aimed for. The paper presents first numerical simulations of the flow performed during the design process in order to identify a general jet formation criterion and optimize the device's performances. The fabrication process of this micro-magneto-mechanical system (MMMS) is then briefly described. The full size of the device, including packaging and actuation, does not exceed 1 cm 3 . The evaluation of the performances of the synthetic jet with 600 μm orifice was performed. The results show that the optimum working point is in the frequency range 400-700 Hz which is in accordance with the frequency response of the magnet-membrane mechanical resonator. In this frequency range, the microjet reaches maximum speeds ranging from 25 m s −1 to 55 m s −1 for an electromagnetic power consumption of 500 mW. Finally the axial velocity transient and stream-wise behaviours in the near and far fields are reported and discussed.

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Section: Introductionmentioning

confidence: 99%

Synthetic jets based on micro magneto mechanical systems for aerodynamic flow control

Gimeno¹,

Talbi²,

Viard³

et al. 2010

J. Micromech. Microeng.

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“…As mentioned in [18], in some configurations, an important fluid-structure interaction can be induced by the influence of the four silicon walls on the pressure drop in the channel. In that case, even when no external actuation forces (no magnet, no coil) are used, a self-actuation of the system by the fluid results in a resonant mode within the frequency range of 1 kHz to 2 kHz tunable according to the differential pressure [18], [19]. This original actuation technique involving no energy supply and adapted to higher frequencies is discussed in [18].…”

Section: Dynamical Actuationmentioning

confidence: 99%

A magnetically actuated, high momentum rate MEMS pulsed microjet for active flow control

Ducloux¹,

Viard²,

Talbi³

et al. 2009

J. Micromech. Microeng.

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A small-sized, high momentum rate (>10 −2 N), dynamically actuated microvalve fulfilling the functional specifications for active aerodynamic flow control was designed, fabricated and characterized. The prototype consists of a microfabricated silicon channel pinched by an actuated poly(dimethyl siloxane) (PDMS) polymer membrane. Actuation is provided by coupling an inductive driving coil and a NdFeB permanent magnet fixed on the PDMS elastomeric membrane. The development of a specific microfabrication process, and a complete characterization of the fabricated prototypes are presented in this paper. The yield air microjet performances reach 150 m s −1 for an actuation frequency situated in the range [0 Hz-400 Hz] and an outlet area of about 1 mm 2 . Experimental results also show that the use of a vectoring plate placed at the outlet of the microvalve provided not only easier integration of the microsystem, but also improved the penetration of the microjet into the main flow.

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“…Fig.1 shows a Micro-electromechanical Systems (MEMS) actuator designed by Duclox [3]. The schemes and fabricated process are detailed in Duclox, et al [3,6]. The micro-jet actuator is the most important component affecting the flow control performance of reducing aerodynamic drag.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Flow Characteristics of A Micro Jet Actuator

Wu¹,

Li²

2017

Proceedings of the 2017 International Conference on Manufacturing Engineering and Intelligent Materials (ICMEIM 2017)

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Abstract. In order to reduce fuel consumption and vehicle exhaust emissions, it is necessary to develop new designs, such as flow control using jet actuators, to reduce vehicle aerodynamic drag. A numerical model was developed based on the process of airflow passed through a micro-jet actuator. Under different inlet pressure, the flow field and its characteristics were analyzed with computational fluid dynamics (CFD) method. The numerical results show that a high outlet airflow velocity can be obtained as the inlet pressure exceeds 1.0e5 Pa for this actuator. Therefore, this type of actuator can be used for vehicle airflow control to reduce aerodynamic drag.

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Magnetically Actuated Microvalves for Active Flow Control

Cited by 7 publications

References 4 publications

Synthetic jets based on micro magneto mechanical systems for aerodynamic flow control

Synthetic jets based on micro magneto mechanical systems for aerodynamic flow control

A magnetically actuated, high momentum rate MEMS pulsed microjet for active flow control

Numerical Study on Flow Characteristics of A Micro Jet Actuator

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