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Comparison Of Positive Displacement Machines And Turbomachines

Driven machines release absorbed mechanical work to a liquid or gaseous medium. They are divided into positive displacement machines and turbomachine according to their function. For large volumetric flow rates the benefits of turbomachines are predominant, such as centrifugal pumps; for small volumetric flow rates piston engines are more likely to be used.

The trainer allows the comparison of different machines for liquid and gaseous media. One turbomachine and four different positive displacement machines, two with rotating pistons and two with oscillating pistons, are supplied. Software for data acquisition and visualisation makes the experiments especially clear and enables fast execution of experiments with reliable results.

includes a drive motor with speed adjustment, belt drive and protective hood, two pressure vessels for experiments with compressors and two water tanks for experiments with pumps. Each machine is mounted on a plate and can easily be placed in the trainer. The machines are driven by a belt drive. The pumps are connected to a closed water circuit via hoses with quick-release couplings. Sensors measure the pressures at inlet and outlet, temperature, engine speed and engine output. The respective flow rate is measured indirectly via fill level (water) or Venturi nozzle (air).

The measured values are read from digital displays and can at the same time be transmitted via USB directly to a PC where they can be analysed using the software included.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

The unit shall perform the following experiments and investigations:

Learning Objectives Experiments
different pump and compressor types
Identifying characteristic data
Recording pump, compressor and system characteristics
Representation of operating points in series and parallel configuration of centrifugal pumps - comparison of the different delivery properties

Specification:

Comparison of driven machines for liquid and gaseous media
Closed water circuit
Two compressors: piston compressor and rotary vane compressor
Four pumps: piston pump, impeller pump, two centrifugal pumps
Drive motor with variable speed
Flow determined by level (water) or Venturi tube (air)
Digital displays for pressure, differential pressure, temperature, speed and drive power
Software for data acquisition via USB under Windows Vista or Windows 7
For data acquisition via USB under Windows Vista or Windows 7

Technical Data:

Piston compressor
Max. volumetric flow rate: 115L/min
Max. pressure difference: 10bar
Rotary vane compressor
Max. volumetric flow rate: 90L/min
Max. pressure difference: 0...7bar
Safety valve: 0,8bar
2 centrifugal pumps
Max. flow rate: 60L/min, max. head: 18m
Piston pump
Max. flow rate: 14,6L/min
System pressure is limited to max. 6bar
Impeller pump
Max. flow rate: 25L,/min, max. pressure: 1,5bar
Electric motor, 4-pole
Max. power: 0,75kW
Nominal speed: 1370min-1
2 pressure vessels: 10L, max. 10bar
2 water tanks: 60L, 10L
Measuring ranges
Speed: 0...2500min-1
Electric power: 0...1375W
Temperature: 0...200°C
Pressure: lx 0...2bar; lx 0...6bar; ix 0...10bar
Differential pressure: 0...10mbar
Dimensions and Weight
LxWxH: 2320 x 680 x 1655mm
Weight: approx. 230kg

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Comparison Of Positive Displacement Machines And Turbomachines

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