Compressible fluids change their density due to pressure change in the flow. Flows with velocities less than Ma 0,3 are regarded as incompressible and the change in density is negligible. At higher velocities, the density has to be included in calculations. These conditions must be taken into consideration when designing e.g. turbo compressors, jets and fast planes. Pressure losses are studied in a pipe elbow, various pipe sections and a nozzle with sudden enlargement. The nozzle with gradual enlargement (de Laval nozzle) provides an introduction to the topic of sonic flow. The volumetric flow rate is measured in an orifice using a differential pressure manometer. The orifice is fitted with four interchangeable orifice disks for different measurement ranges. The fan’s characteristic curve can also be recorded by using a throttle valve. A radial fan with infinitely variable speed control draws in air from the environment. At the intake the air flow is accelerated in a measuring nozzle. Further down the measuring section the air flows through interchangeable measuring objects. Drawing in the air and the arrangement of the measuring objects on the intake side of the fan minimise turbulence when flowing into the measuring objects. All measuring objects are made of transparent material and provide excellent insight into the inner structure.

Specifications:

Investigate flow of compressible fluids

Pressure curve at subsonic and sonic nozzle flow

Orifice for determining volumetric flow rate by differential pressure measurement

Record fan characteristic curve using a throttle valve

Digital displays for pressures, velocity and speed

Subsonic and sonic air flow

Variable speed on the radial fan for adjusting the mass flow rate

Measuring nozzle for determining the mass flow rate

Pressure losses in subsonic flow in pipe elbows and various pipe sections

Minimised turbulence by drawing in air and optimum arrangement of the measuring objects

Transparent measuring objects with connectors for pressure measurement provide insight into the internal structure

 

Technical data:

Measuring objects

Pipe section: 1m

Ø 16, 24, 34mm

90° pipe elbow

2 nozzles, inner diameter: 12…34mm

With sudden enlargement

With gradual enlargement (de laval nozzle)

Radial fan

Max. Speed: 31000min-1

Max. Volumetric flow rate: 226m3/h

Max. Head: 318mbar

Max. Power consumption: 1,8kw

Orifice with orifice disks

Ø 12, 19, 25, 32mm

Throttle valve: ø 34mm

Measuring ranges

Speed: 0…99999min-1

Pressure:

1x 0…25mbar

1x 0…600mbar

1x 0…1000mbar

Velocity: 0…65m/s

230v, 50hz, 1 phase

120v, 60hz, 1 phase, 230v, 60hz, 1 phase

Dimensions and weight

Lxwxh: 1750x600x390mm

Weight: approx. 58kg.