等离子体流动控制
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
DBD Plasma Actuator “Opportunities for Flow Control”
Thomas Corke
University of Notre Dame
Institute for Flow Physics and Control
Hessert Laboratory for Aerospace Research
Aerospace and Mechanical Engineering
Objective
“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, 2010
Issues
What 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 control
applications?
What are the environmental sensitivities?
How good are predictive models?
Based on what we have learned, are there other applications of this technology?
Growing Interest
June 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 parts
Potential long life
Withstand high g-loading
High dynamic response
Ease of application and compactness
Can be placed at the most receptive locations
DBD actuator effect (body force) most easy to incorporate in CFD DBD actuators can also be sensors
Properties of DBD Actuators
•Ionized air in presence of electric field results in body force that acts on neutral exposed electrode
dielectric
covered electrode
substrate
Wall Jet?
air .
•Body force is mechanism of flow control.
“Wall Jet with Suction”
Complete Characteristics
DBD Plasma Actuators have proven to be excellent for separation control for a wide range of Mach numbers
Θ
Decreasing R
Not a simple function of Cµ
Flow Separation Applications
Fan
Retreating Blade
Stall
Dome Drag
Inter-turbine Duct
Inlets LPT Blades
HPT Tip/Gap
Wing
Fuselage
Aerodynamic Force
Vectoring High α
Improving DBD FC Performance
Increase Body Force: AC Waveform/Frequency, Dielectric, Geometry,
Combined DC/AC
Increase Receptivity:
Geometry Modifications,
Fluid Instabilities,
Unsteady Forcing Actuator
Performance
Environmental Effects:
Actuator Design: Jet-suction, SVGs, Vertical Jets, Roughness
Flow Physics
Metrics of Merit:
Flow Control,
Energy Budget Actuator
Requirements
P s,Moisture
Predictive Models Modeling/CFD are necessary for design of efficient flow control
systems
Requires efficient(semi-
empirical) DBD models
Models need to be validated
Need to agree on the level of validation
Time-averaged body
force vectors
Body force/Voltage
scaling
Time dependent body
force