HM 299 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 HM 299 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.
HM 299 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.
- investigation of different driven machines: pumps and compressors
- experiments with liquid or gaseous media
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
Drive 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
- power consumption: 0…1375W
- temperature: 0…200°C
- pressure: 1x 0…2bar; 1x 0…6bar; 1x 0…10bar
- differential pressure: 0…10mbar
230V, 50Hz, 1 phase
230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
UL/CSA optional
- comparison of driven machines for liquid and gaseous media
- closed water circuit
- 2 compressors: piston compressor and rotary vane compressor
- 4 pumps: piston pump, impeller pump, 2 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
- GUNT software for data acquisition via USB under Windows 7, 8.1, 10
- 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