Radial compressors are used to compress gases. The medium is sucked in axially to the drive shaft by the rotation of the impeller and flows through the impeller rotating at high speed. By means of centrifugal force, the medium is accelerated towards the outer edge and is compressed in this manner.

  The experimental unit provides the basic experiments to get to know the operating behaviour and the important characteristic variables of radial compressors.

  HM 292 features a two-stage radial compressor with variable speed via frequency converter, an intake pipe and a delivery pipe. The intake and delivery pipes are transparent. A protective plate placed in front of the inlet of the intake pipe prevents larger objects from being sucked in or the clogging of the intake opening. The air flow is adjusted by a throttle valve at the end of the delivery pipe. 
  The experimental unit is fitted with sensors for pressure, temperature and speed. The flow rate is determinated via differential pressure measurement on the intake nozzle.
  The microprocessor-based measuring technique is well protected in the housing. All the advantages of software-supported experiments and evaluation are offered by the GUNT software and the microprocessor. The connection to a PC is made by USB.

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

- operating behaviour and characteristic variables of

  a radial compressor 

- recording of the compressor curve for both stages

- effect of the impeller speed on the pressure

- effect of the impeller speed on the flow rate

- distribution of stage pressure ratios

- effect of compression on the temperature increase

- determination of hydraulical power output and

  efficiencies