Lift-Enhancing Vortex Flows Generated by Plunging Rectangular Wings with Small Amplitude

D. E. Calderon*, Z. Wang, I. Gursul

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

15 Citations (Scopus)

Abstract

Experiments in a water tunnel have been carried out on low-aspect-ratio rectangular wings undergoing a small-amplitude harmonic plunge motion at Reynolds numbers 10,000 and 20,000. A series of measurement techniques have been used, including force measurements, hot film, particle image velocimetry, and volumetric velocimetry measurements, to study the lift enhancement as a function of forcing frequency. Multiple peaks in the time-averaged lift have been observed, occurring at frequencies in the order of natural vortex-shedding frequencies of the stationary wings. It is postulated that interaction between the leading-edge and trailing-edge vortices contributes to the selection of the optimal frequencies for the time-averaged lift. At a specific Strouhal number, an adverse interaction between the vortices results in a vortex dipole that directs flow upstream. A comparison between a NACA 0012 and flat-plate profile provides further insight into the advantages and disadvantages of using a thinner profile in low-Reynolds-number flows.

Original languageEnglish
Pages (from-to)2953-2964
JournalAIAA Journal
Volume51
Issue number12
DOIs
Publication statusPublished - Dec 2013
Event48th AIAA Aerospace Sciences Meeting and Exhibit Including the New Horizons Forum and Aerospace Exposition - Orlando, United Kingdom
Duration: 4 Jan 20108 Jan 2010

Keywords

  • LOW-ASPECT-RATIO
  • LOW REYNOLDS-NUMBERS
  • FLAT-PLATE
  • PARTICLE TRACKING
  • HEAVING AIRFOIL
  • INSECT FLIGHT
  • AERODYNAMICS
  • ENHANCEMENT
  • MECHANISMS
  • OSCILLATIONS

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