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DEVELOPMENT AND CHARACTERIZATION OF A PULSED JET ACTUATOR BASED ON SONIC FLOW CONTROLLED BY PLASMA

Jean-Paul Bonnet
Institut Pprime-Branche fluide Université de Poitiers 43 route de l'aérodrome,86000 Poitiers, France

Gwenaël Acher
Institut PPRIME CNRS - Université de Poitiers – ISAE/ENSMA SP2MI Téléport 2 Bd Marie et Pierre Curie BP 30179, Futuroscope, 86962 Poitiers, France

Pierre Audier
Institut PPRIME CNRS - Université de Poitiers – ISAE/ENSMA SP2MI Téléport 2 Bd Marie et Pierre Curie BP 30179, Futuroscope, 86962 Poitiers, France

Adrien Robert
Institut PPRIME CNRS - Université de Poitiers – ISAE/ENSMA SP2MI Téléport 2 Bd Marie et Pierre Curie BP 30179, Futuroscope, 86962 Poitiers, France

Anton Lebedev
Institut PPRIME CNRS - Université de Poitiers – ISAE/ENSMA SP2MI Téléport 2 Bd Marie et Pierre Curie BP 30179, Futuroscope, 86962 Poitiers, France

Nicolas Benard
Department of Fluids, Thermique et Combustion Institut PPRIME (CNRS UPR3346, Université de Poitiers, ISAE-ENSMA) Bd Marie & Pierre Curie, BP 30279, 86962 Futuroscope, France

Eric Moreau
LASEP, Faculte des Sciences, Université d'Orléans, rue Gaston Berger BP 4043, 18028 Bourges Cedex; Department of Fluids, Thermique et Combustion Institut PPRIME (CNRS UPR3346, Universite de Poitiers, ISAE-ENSMA) Bd Marie & Pierre Curie

Аннотация

The modulation of a sonic flow in view of high authority actuator design is based on the increase of the temperature at a sonic throat with the help of a plasma discharge. Indeed, for a perfect gas, the flow rate being proportional to the inverse of the square root of the temperature at a constant settling chamber pressure, the jet flow rate should be able to be varied. In view of flow control actuator design, the frequency is then no limited by any mechanical constraint. The discharge can be either continuous or pulsed at high frequencies. The influence of the settling chamber pressure and electrode gap distance have been investigated. For an aerodynamically steady actuation, the jet flow rate can be reduced down to 70% of its nominal value (30% of flow rate reduction), the best effectiveness being obtained with a DC discharge. The temperature increases from 290K to up to 650K for sonic regime. The speed of sound (and then the jet velocity for sonic conditions) is increased by a factor of 1.5 when the plasma is operated Transient phenomena are evidenced by high speed Schlieren. A low velocity version is obtained with a channel added downstream In this case, a modulation of the subsonic (37m/s) jet velocity is observed, with a max velocity of 60 m/s with a large increase of the velocity fluctuations when the plasma is activated. This actuator has several interests when compared to conventional pulsed jets: no mechanical device, high frequency response. The pulsed jet contains high velocity (by a factor of 1.5), high temperature (by a factor of 2) impulses with lower flow rate and high turbulence levels.