# Designing and Building a Low-Cost, Laminar Flow Wind Tunnel - PowerPoint PPT Presentation

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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

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

S. ClardyHenderson State University, Arkadelphia, AR

### 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

• Cost

• Designed to be built for under \$5000

• Facility Layout

• Placed in a 6’x24’ room

• Hallway considerations

Hallway

Wind Tunnel Room

Shop

Classroom

Hallway

Wind Tunnel Room

Shop

Classroom

### 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

• 18”x18”x36”

• ½” plexiglass

• Center and wall mounting systems

• Sample size: 14.4” across the chamber

### 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!

• Arkansas Space Grant Consortium

• Ellis College Planning and Advisory Committee

• HSU Physics

• Student Collaborators:

• Ross Pilgreen

• Nathan Johnson

• Jonathan Springer

• Brian Terry

• Matthew Bolt