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Institute of Turbomachinery and Fluid Dynamics
Logo Leibniz Universität Hannover
Institute of Turbomachinery and Fluid Dynamics
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Large Centrifugal Compressor (LCC)

Field of Applications

  • Application of inlet guide vanes
  • Variation of the volute geometry
  • Flexible application of optical measurement techniques (L2F, PIV)

Measurement Techniques

  • Steady and unsteady pressure measurement techniques
  • Temperature measurement techniques (Type K and PT100)
  • Torque shaft measurement techniques
  • Acceleration sensors for vibration monitoring
  • CTA and CCA probes for measuring velocity vectors and flow field turbulence
  • PIV – Particle Image Velocimetry
  • L2F – Laser 2 Fokus


  • Output power: 
  • Rotational speed: 
  • Mass flow:
  • Total pressure ratio:
  • Max. isentropic efficiency:
  • Impeller diameter:
  • Max. tip speed Mach number:
  • Load coefficient: 
  1. 1 350 kW
  2. 18 000 rpm
  3. 9 kg/s
  4. 2.4
  5. 85%
  6. 400 mm
  7. 1.12
  8. 0.25 – 1.3


Centrifugal compressors have a wide range of industrial applications. The advantages of a centrifugal compressor compared to other compressor designs are its compact size and its robustness. In addition, it is possible to achieve higher pressure ratios in a single stage configuration.

The test rig of the large centrifugal compressor (LCC) has a modular single stage design which allows a wide variety of studies. For example there are different compressor wheels, diffusers, and inlet guide vanes available.

A special feature of the test rig is its closed-loop capability. In closed-loop configuration the air intake can be throttled, reducing the inlet pressure below ambient. This reduces the power needed for a desired pressure ratio.

The test rig can be simply described as follows. Air is sucked in from the ambient atmosphere and runs through a settling chamber with a flow straightener. From the flow straightener the air is directed to the inlet guide vane (IGV) system and in the compressor wheel. In the subsequent diffuser the air is decelerated leading to an increased static pressure. Afterwards the air is collected in a volute and leaves the test rig through a exhaust chimney pipe system. In closed-loop operation mode the pressurized air is cooled in a heat exchanger and reenters the test rig in front of the settling chamber.


Dipl.-Ing. Thorge Kentschke