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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. 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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  1. Designing and Building a Low-Cost, Laminar Flow Wind Tunnel S. ClardyHenderson State University, Arkadelphia, AR

  2. 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

  3. 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

  4. Open return vs. Closed Return Systems

  5. Open Design with Semi-CloseD Effects Due to Placement Hallway Wind Tunnel Room Shop Classroom

  6. Our Windtunnel

  7. 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.

  8. The Viewing Chamber • 18”x18”x36” • ½” plexiglass • Center and wall mounting systems • Sample size: 14.4” across the chamber

  9. The Diffuser

  10. 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

  11. 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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