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The Deltalab EA102 Wind-Tunnel produces a two-dimensional jet which discharges along a flat plate so that boundary-layer studies can be carried out. The plate can be removed for experiments in two-dimensional free jet flow, and for hot-wire anemometer probe calibration.


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 Ref EV240
- 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

- Total head probe
- Pitot tube, series EV100
- Projection micro-manometer, resolution 0.2 mm water column Ref EI200, Ref EI210
- Hot wire anemometer and probes Ref EV240


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