The experimental unit – used in the aerodynamics trainer – allows the boundary layer on a flat plate to be studied. For this purpose, air flows along the plate, parallel to the surface. The plate has two different surfaces so as to study the effect of surface conditions on the boundary layer. Side bodies can be used in the measuring section. Thus the boundary layer phenomena can experience interference with a degressive or progressive pressure curve and, for example equalise the friction loss of the flow.

The experimental unit is attached to the trainer, simply and precisely with quick release fasteners.

During incident flow of bodies fluids such as air “stick” to the surface of the body and form the so-called boundary layer. The kind of flow within the boundary layer – laminar or turbulent – significantly affects the drag. A horizontally movable Pitot tube, adjusted using a micrometer screw, measures the total pressures at various distances from the plate surface. The plate can be moved vertically to enable the recording of total pressures in the direction of flow. The velocity can be determined from the pressures read off the tube manometers. The findings from studying the boundary layer are taken into consideration when designing aero planes, vessels and turbomachines.

Specification:

Investigation of boundary layers on a flat plate with flow along the plate

Pitot tube for measuring the total pressure at the plate

Adjustment of the pitot tube to the plate using micrometer screw

Accessories for the aerodynamics trainer

Moveable plate, along the direction of flow

Removable side bodies for interference of the boundary layer with degressive or progressive pressure profile

16 tube manometers for displaying the dynamic pressures

Plate with two different rough surfaces.

Technical data:

Pitot tube

Diameter: 0,7mm

Plate, movable: 0…250mm

Movable: 0,35…50mm

Lxw: 260x55mm, thickness: 5mm

Chamfer: 30°

2 side bodies, removable

Inclination: 1:12,5

Smooth surface: 25µm

Rough surface: 400µm.