应用等离子体实现主动流动控制的实验研究
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DBD Plasma Actuator “Opportunities for Flow Control”Thomas CorkeUniversity of Notre DameInstitute for Flow Physics and ControlHessert Laboratory for Aerospace ResearchAerospace and Mechanical EngineeringObjective“set the context in terms of applications and/or motivations for the continued exploration and/or development of DBD plasma actuators”D. Smith, Feb. 4, 2010IssuesWhat is behind the surge in interest of DBD flow control?What are the properties of DBD plasma actuators that make it useful for flow control?How do we marry these properties to flow controlapplications?What are the environmental sensitivities?How good are predictive models?Based on what we have learned, are there other applications of this technology?Growing InterestJune 1, 2009:AIAA Names Plasma Actuators as No 5. of the “Top Ten Emerging Aerospace Technologies”What is the appeal of DBD plasma actuators?No moving partsPotential long lifeWithstand high g-loadingHigh dynamic responseEase of application and compactnessCan be placed at the most receptive locationsDBD actuator effect (body force) most easy to incorporate in CFD DBD actuators can also be sensorsProperties of DBD Actuators•Ionized air in presence of electric field results in body force that acts on neutral exposed electrodedielectriccovered electrodesubstrateWall Jet?air .•Body force is mechanism of flow control.“Wall Jet with Suction”Complete CharacteristicsDBD Plasma Actuators have proven to be excellent for separation control for a wide range of Mach numbersΘDecreasing RNot a simple function of CµFlow Separation ApplicationsFanRetreating BladeStallDome DragInter-turbine DuctInlets LPT BladesHPT Tip/GapWingFuselageAerodynamic ForceVectoring High αImproving DBD FC PerformanceIncrease Body Force: AC Waveform/Frequency, Dielectric, Geometry,Combined DC/ACIncrease Receptivity:Geometry Modifications,Fluid Instabilities,Unsteady Forcing ActuatorPerformanceEnvironmental Effects:Actuator Design: Jet-suction, SVGs, Vertical Jets, RoughnessFlow PhysicsMetrics of Merit:Flow Control,Energy Budget ActuatorRequirementsP s,MoisturePredictive Models Modeling/CFD are necessary for design of efficient flow controlsystemsRequires efficient(semi-empirical) DBD modelsModels need to be validatedNeed to agree on the level of validationTime-averaged bodyforce vectorsBody force/VoltagescalingTime dependent bodyforcePredictive Model ValidationTime-averaged Body Force Scaling with Voltage Time-resolved Body ForceModelExperimentNeed for innovative ExperimentsAcoustic DipoleSummaryThe characteristics of DBD plasma actuators makes them a popular choice for flow controlAlthough there has been an emphasis on their “thrust”capabilities (Cµ), their “suction effect” is equally asimportant (unique)There are numerous applications that are well suited to their capabilities, particularly focusing on separationcontrolSuccessful flow control begins by understanding the flow physics, which then guides the flow actuatorrequirementsUse of flow instabilities, small geometricmodifications can reduce actuator requirementsPredictive capabilities are essentialOther Applications Plasma Adaptable OpticsPlasma AssistedPlasma Periodic Roughness Methane CombustionPlasma Anemometer。