Air Flow Experimental Plant


Fluid mechanics is concerned with the physical behavior of fluids. An important branch of fluid mechanics is the analysis of air flow in the incompressible range in order to be able to determine the pressure distribution and the velocity profile of a flow. In practice, the findings from these experiments are necessary when devising and designing turbomachines.

With its extensive range of accessories, the FM 303 unit offers a variety of experiments in the field of steady, incompressible flow. The external Pitot tube is used to measure free jets; the inner Pitot tube allows investigation of the air flow within the pipe section. A low-loss inlet and the length of the pipe section realize an optimal formation of the air flow. The air flow can optionally be studied via a nozzle or orifice plate. An iris diaphragm allows the diameter of the air flow to be varied. Pipe friction losses on various pipe fittings can be investigated. Up to 20 pressure measuring points mean the pressure conditions along the measuring section can be determined. The pressures that are read off the tube manometer make it possible to determine the pressure distribution and flow velocity.

In addition to the extensive accessories supplied, there is the optional Venturi tube FM-303.01 for practical verification of the continuity equation and the conservation of energy during a change in cross-section of the air jet. As an additional optional accessory, FM 303.02 offers boundary layer measurements on a flat surface in longitudinal flow. The experiment results are used to determine velocity distributions within the boundary layer and to represent the boundary layer thickness.


  1. Experiments from the field of steady incompressible flow
  2. Horizontal measuring section
  3. Radial fan infinitely variable via frequency converter
  4. Pitot tube in the free jet, 3-dimensional adjustable
  5. Pitot tube within the pipe section, vertically adjustable at 3 positions, adjustable height
  6. Different measuring objects: orifice plate, nozzle, iris diaphragm, pipe fittings
  7. 16 tube manometers for displaying the pressures

Technical Details          

  1. External Pitot tube in the free jet, 3-dimensional adjustable
  2. Horizontal: ±140mm
  3. Vertical: -80…120mm
  4. Inner Ø: 2mm
  5. Internal Pitot tube, sliding
  6. Vertical: ±40mm
  7. Inner Ø: 1,1mm
  8. 20 pressure measuring points
  9. Radial fan
  10. Max. motor power: 550W
  11. Max. flow rate: 22m3/min
  12. Max. differential pressure: 0,73kPa
  13. 16 tube manometers
  14. Resolution: 1-fold, 2-fold, 5-fold and 10-fold
  15. max. resolution: 1Pa
  16. Iris diaphragm: Ø 40…75mm
  17. Orifice plate/nozzle: Ø 50mm
  18. 3 pipe fittings
  • 230V, 50Hz, 1 phase
  • 230V, 60Hz, 1 phase