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Title of Journal: Exp Fluids

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Abbravation: Experiments in Fluids

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Springer-Verlag

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DOI

10.1016/0008-8749(90)90016-k

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1432-1114

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Using stereo multigrid DPIV SMDPIV measurements

Authors: K Parker K D von Ellenrieder J Soria
Publish Date: 2005/05/11
Volume: 39, Issue: 2, Pages: 281-298
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Abstract

The structure of the flow behind wings with finite span 3D is significantly more complex than the flow behind infinite span 2D wings It has been shown that the presence of wingtip vortices behind finite span wings significantly modifies the geometry of the wake flow It is felt that this modification alters the dynamics of interaction between leading and trailing edge vorticity in a manner that affects the ability of 2D flapping wings to produce thrust A model of the mean flow skeleton has been proposed from qualitative flow visualization experiments An unambiguous quantitative representation of the actual flow is required for comparison to the proposed model To accomplish this the full 3D 3C velocity is required in the volume behind the 3D flapping wing It is proposed to use stereoscopic multigrid digital particle image velocimetry SMDPIV measurements to investigate this unsteady oscillatory flow This paper reports preliminary SMDPIV measurements along the plane of a symmetrical NACAprofile wing at a Strouhal number of 035 Phase averaged measurements are used to investigate the complex flow topology and the influence of the forcing flow on the evolution of the large scale structure of a jetflow This paper focuses on optimizing the SMDPIV experimental methodology applied to liquid flows By refining the 2D 3C technique the 3D topology of the flow can be investigated with a high degree of accuracy and repeatability Preliminary results show that the flow is characterized by two pairs of coherent structures of positive and negative vorticity The arrangement of these structures in the flow is controlled by the motion of the wing Vorticity of opposite rotation is shed at the extreme heave and pitch positions of the aerofoil to set up a thrust indicative vortex street in support of the suggested topological model


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Other Papers In This Journal:

  1. Passive mixing control of plane parallel jets
  2. Planar fluorescence for round bubble imaging and its application for the study of an axisymmetric two-phase jet
  3. Imaging diffusion in a microfluidic device by third harmonic microscopy
  4. Two- and three-dimensional flows in nearly rectangular cavities driven by collinear motion of two facing walls
  5. Vortex dynamics and mass entrainment in turbulent lobed jets with and without lobe deflection angles
  6. Influence of a wavy boundary on turbulence.
  7. A novel data reduction technique for single slanted hot-wire measurements used to study incompressible compressor tip leakage flows
  8. Digital holography for micro-droplet diagnostics
  9. Kriging regression of PIV data using a local error estimate
  10. Active control of an axisymmetric jet with distributed electromagnetic flap actuators
  11. Experimental investigations on steady wake effects in a high-lift turbine cascade
  12. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  13. Simultaneous droplet and vapour-phase measurements in an evaporative spray by combined ILIDS and PLIF techniques
  14. Experimental study of liquid–vapor phase distribution in a single tube capillary evaporator
  15. Analysis of the impact of impeller geometry on the turbulent statistics inside a fan-stirred, cylindrical flame speed vessel using PIV
  16. Detection of microorganismic flows by linear and nonlinear optical methods and automatic correction of erroneous images artefacts and moving boundaries in image generating methods by a neuronumerical hybrid implementing the Taylor’s hypothesis as a priori knowledge
  17. Hot-wire spatial resolution effects in measurements of grid-generated turbulence
  18. Effect of experimental parameters and image noise on the error levels in simultaneous velocity and temperature measurements using molecular tagging velocimetry/thermometry (MTV/T)
  19. Turbulence measurements in pipe flow using a nano-scale thermal anemometry probe
  20. The pinch-off process in a starting buoyant plume
  21. Defining the roughness sublayer and its turbulence statistics
  22. Evolution of a forced counter rotating vortex pair for two selected forcing frequencies
  23. Optically efficient fluorescent tracers for multi-constituent PIV
  24. Intermittent corner separation in a linear compressor cascade
  25. A novel architecture for a super-resolution PIV algorithm developed for the improvement of the resolution of large velocity gradient measurements
  26. Measurement of the turbulent kinetic energy budget of a planar wake flow in pressure gradients
  27. Correcting hot-wire spatial resolution effects in third- and fourth-order velocity moments in wall-bounded turbulence
  28. High-speed roll coating with complex rheology fluids
  29. Wing–vortex interaction: unraveling the flowfield of a hovering rotor
  30. Near-surface velocimetry using evanescent wave illumination
  31. Designing a maximum precision interferometric particle imaging set-up
  32. Characterizing the lower log region of the atmospheric surface layer via large-scale particle tracking velocimetry
  33. Development and characterization of high-frequency resonance-enhanced microjet actuators for control of high-speed jets
  34. PIV measurement of internal flow characteristics of very low specific speed semi-open impeller
  35. A new method for measuring turbulent heat fluxes using PIV and fast-response cold-wires
  36. Reynolds number dependence of the inertial range scaling of energy dissipation rate and enstrophy in a cylinder wake
  37. Velocity measurements in the oscillatory boundary layer produced by acoustic waves
  38. Measurement of velocity profiles in a rectangular microchannel with aspect ratio α = 0.35
  39. Velocity measurements in the oscillatory boundary layer produced by acoustic waves
  40. Global Doppler frequency shift detection with near-resonant interferometry
  41. Polymer-induced turbulence modifications in an impinging jet
  42. Quantitative detection of turbulent reattachment using a surface mounted hot-film array

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