Wind Tunnel For Boundary Layer Experiments

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Wind-Tunnel-For-Boundary-Layer-Experiments

Product Code: AEM031

Wind Tunnel For Boundary Layer Experiments Manufacturer

Wind Tunnel For Boundary Layer Experiments

Teaching objectives

The following experiments may be carried out with or without a constant temperature anemometer.

  • Boundary layer growth in the case of a two-dimensional wall jet.
  • Measurement of velocity profiles.
  • Measurements in laminar and turbulent boundary layers .
  • Establishment of a dimensionless profile and invariants.
  • Determination of the local skin-friction coefficient.
  • Studies of mass and momentum flows, determination of dimensionless coefficients.
  • Additional experiments which can be carried out with a constant temperature anemometer .
  • Hot wire anemometer calibration.
  • Verification of King’s law.
  • Effects of probe angle relative to the main stream velocity direction.
  • Introduction to measurements in turbulent flows.
  • Measurements of turbulent intensity in a free jet and in a boundary layer.
  • Measurements of turbulence spectra for different Reynolds numbers.

 

Technical specifications

A centrifugal fan is mounted inside a settling chamber, of 0.25 sq.m cross-section, which is fitted with an interchangeable filter, an anodised aluminium honeycomb flow straightener, and a bronze screen to lower the turbulence level.

  • A plexiglas two-dimensional contraction, with a contraction ratio of 30, ensures good flow distribution at the jet exit.
  • A simple mechanical by-pass system on the chamber wall is used for progressive and accurate control of the jet exit velocity up to 25 m/s.
  • The jet is confined by two vertical side-walls constructed in plexiglas. One of the panels is hinged and can be lowered to allow access to the test section.
  • The traversing gear can be displaced along the entire length of the test section by means of a carriage mounted on linear ball races, which can be locked in position. Probe position is given by a pointer on the carriage and a scale on the test section.
  • The traversing gear is designed to allow vertical displacement of the probe along the centre-line of the test section. Vertical position is determined by means of a vernier to within 0.01 mm. Fixtures permit the use of interchangeable probes of different diameters.
  • A boundary layer probe available as standard.
  • Motor rating: 230 W.
  • Jet velocity: up to 25 m/s.
  • Nozzle width: 300 mm.
  • Nozzle height: 10 mm

Complementary equipment:

  • Total head probe.
  • Pitot tube.
  • Projection micro-manometer, resolution 0.2 mm water column.
  • Hot wire anemometer and probes.

 

Dimensions and weight

  • 2300 x 590 x 1760 mm (L x W x H) – 50 kg

Essential requirements

  • 220V – 50 Hz, other voltages available on demand
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