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Designing and Building a Low-Cost, Laminar Flow Wind Tunnel. S. Clardy Henderson State University, Arkadelphia, AR. Motivation.

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designing and building a low cost laminar flow wind tunnel

Designing and Building a Low-Cost, Laminar Flow Wind Tunnel

S. ClardyHenderson State University, Arkadelphia, AR

motivation
Motivation
  • The purpose of this study was to design and build a “small scale” wind tunnel (net length is approx. 20 ft – test chamber length is 3 ft) in which experimenters can reliably determine the turbulent effects from the wing itself versus effects created by the wind tunnel design and the medium used to view the turbulent flow.
  • Partnership in Light Sport Aircraft to study potential new wing designs to reduce vortices
project constraints
Project Constraints
  • Cost
    • Designed to be built for under $5000
  • Facility Layout
    • Placed in a 6’x24’ room
    • Hallway considerations

Hallway

Wind Tunnel Room

Shop

Classroom

open design with semi closed effects due to placement
Open Design with Semi-CloseD Effects Due to Placement

Hallway

Wind Tunnel Room

Shop

Classroom

the nozzle
The Nozzle
  • Shape determined by 5th order Bell-Metha polynomials1
  • Y is the height, x is horizontal distance, L is the total axial length (4ft)
  • Using boundary condition
    • a= -7.5
    • b=18.75
    • c=-12.5
    • d=0
    • e=0
    • f=2

1. Justin Pereira, ed. Wind Tunnels: Aerodynamics, Models, and Experiments. Nova Science Publishers, Inc., 2011, Ch 7.

the viewing chamber
The Viewing Chamber
  • 18”x18”x36”
  • ½” plexiglass
  • Center and wall mounting systems
  • Sample size: 14.4” across the chamber
material and construction decisions
Material and Construction Decisions
  • Nozzle
    • Fiberglass
    • Cast in 2 halves
    • Mold created from wood and foam
  • Diffuser
    • Fiberglass
    • Cast in 2 halves (length-wise)
    • Mold created from wood
    • Square outlet vs. round outlet
thanks
Thanks!
  • Arkansas Space Grant Consortium
  • Ellis College Planning and Advisory Committee
  • HSU Physics
  • Student Collaborators:
    • Ross Pilgreen
    • Nathan Johnson
    • Jonathan Springer
    • Brian Terry
    • Matthew Bolt
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