Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils
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Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils

Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils


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About the Book

An effort to understand and control the unsteady separated flow associated with the dynamic stall of airfoils was funded for three years through the NASA cooperative agreement program. As part of this effort a substantial data base was compiled detailing the effects various parameters have on the development of the dynamic stall flow field. Parameters studied include Mach number, pitch rate, and pitch history, as well as Reynolds number (through two different model chord lengths) and the condition of the boundary layer at the leading edge of the airfoil (through application of surface roughness). It was found for free stream Mach numbers as low as 0.4 that a region of supersonic flow forms on the leading edge of the suction surface of the airfoil at moderate angles of attack. The shocks which form in this supersonic region induce boundary-layer separation and advance the dynamic stall process. Under such conditions a supercritical airfoil profile is called for to produce a flow field having a weaker leading-edge pressure gradient and no leading-edge shocks. An airfoil having an adaptive-geometry, or dynamically deformable leading edge (DDLE), is under development as a unique active flow-control device. The DDLE, formed of carbon-fiber composite and fiberglass, can be flexed between a NACA 0012 profile and a supercritical profile in a controllable fashion while the airfoil is executing an angle-of-attack pitch-up maneuver. The dynamic stall data were recorded using point diffraction interferometry (PDI), a noninvasive measurement technique. A new high-speed cinematography system was developed for recording interferometric images. The system is capable of phase-locking with the pitching airfoil motion for real-time documentation of the development of the dynamic stall flow field. Computer-aided image analysis algorithms were developed for fast and accurate reduction of the images, improving interpretation of the results. Wilder, M. C. Unspecified Center NCC2-637...


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Product Details
  • ISBN-13: 9781722129781
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 42
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1722129786
  • Publisher Date: 30 Jun 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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Control of Unsteady Separated Flow Associated with the Dynamic Stall of Airfoils
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