Design of a Low-Turbulence, Low-Pressure Wind-Tunnel for Micro-Aerodynamics Journal Article uri icon

Overview

abstract

  • A novel wind-tunnel facility has been designed for measurement of lift and drag on micromachined airfoils. The tunnel is designed to operate with pressures ranging from 0.15 to 1.0 atmosphere, over a velocity range of 30 to 100m∕s, allowing for independent control of Reynolds and Knudsen number. The tunnel is designed for testing of airfoils with chords of 10 to 100 microns, giving a range of Reynolds numbers from 10 to 600, with Knudsen numbers reaching 0.01. Due to the structural constraints of the airfoils being tested, the wind tunnel has a 1cm cross-section. This small size allows the use of a 100-1 contraction area, and extremely fine turbulence screens, creating a low turbulence facility. Computational fluid dynamics is used to show that an ultra-short 100-1 contraction provides uniform flow without separation, or corner vortices. Velocity data obtained with impact and hot-wire probes indicate uniform flow and turbulence intensities below 0.5%.

publication date

  • September 1, 2006

Full Author List

  • Martin MJ; Scavazze KJ; Boyd ID; Bernal LP

Other Profiles

Additional Document Info

start page

  • 1045

end page

  • 1052

volume

  • 128

issue

  • 5