Unsteady vortex flows and buffeting of a low sweep delta wing

G S Taylor, I Gursul

Research output: Contribution to conferencePaper

13 Citations (Scopus)

Abstract

An experimental study was conducted to understand the unsteady vortex flows and buffeting response of a nonslender delta wing with 50° leading edge sweep angle. Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) measurements, surface flow visualization, force balance measurements, and wing-tip acceleration measurements were used. Weak vortex breakdown observed at low incidences is replaced by a conical breakdown with large unsteadiness with increasing incidence. However, the maximum buffeting occurs prior to the stall, after the vortex breakdown has reached the apex of the wing. The largest velocity fluctuations near the wing surface are observed along the reattachment line. Hence, the shear layer reattachment, rather than the vortex breakdown phenomenon, is the most important source of increasing buffet in the pre-stall region as incidence is increased. Velocity fluctuations near the wing surface in the reattachment region exhibit 'dual-peak' frequency spectra. With further increase in incidence, the shear layer reattachment fails resulting in very low velocity fluctuations near the wing surface and a precipitous fall in the rms wing tip acceleration.
Original languageEnglish
Pages6627-6635
Number of pages9
Publication statusPublished - 2004
EventAIAA - Reno, NV, USA United States
Duration: 1 Jan 2004 → …

Conference

ConferenceAIAA
CountryUSA United States
CityReno, NV
Period1/01/04 → …

Keywords

  • Wind tunnels
  • Wings
  • Reynolds number
  • Unmanned vehicles
  • Vortex flow
  • Unsteady flow
  • Correlation methods

Fingerprint Dive into the research topics of 'Unsteady vortex flows and buffeting of a low sweep delta wing'. Together they form a unique fingerprint.

  • Cite this

    Taylor, G. S., & Gursul, I. (2004). Unsteady vortex flows and buffeting of a low sweep delta wing. 6627-6635. Paper presented at AIAA, Reno, NV, USA United States.