Centrifugal compressor test rig

SRV - Impeller and diffuser
SRV - Technical data
SRV - Overview

Measured values

  • Total pressures and total temperatures in front of and behind the stage
  • Mass flow measurement with a standard Venturi tube
  • Measurement of the rotational speed by trigger signals
  • Static pressure taps in the compressor casing along the outer contour over the impeller
  • Three-hole probes
  • Total pressure probes
  • Kulite-probes
  • Static pressures of the compressor and the oil system are measured with a PSI-system
  • Electric sensor signals like PT 100, Fe-CuNi thermocouple, trigger signals and so on are measured with a DELPHIN TopMessage data acquisition system
  • 4-channel tip clearance measurement with a HYTRON system
  • Laser-2-focus velocimetry L2F
  • Particle image velocimetry PIV
  • Doppler global velocimetry DGV

Description of facility

At the centrifugal compressor test rig, single fast-rotating high-loaded centrifugal compressors are investigated. In addition to measuring the compressor performance map, detailed flow field measurements are made in order to analyze the three dimensional flow field within the rotor and the diffuser by using conventional probes and several optical measuring methods like L2F, PIV and DGV. Only optical techniques are applicable within the rotating component. These partly new developed measuring methods have been tested under extreme conditions. To get detailed knowledge and information about noise generation mechanism and noise characteristics of centrifugal compressors, acoustic measurements are taken which need special installations on the suction side like a semi-anechoic channel and a rotary channel equipped with an array of microphones.

The air flow to the compressor passes a filter, a Venturi tube and a flow straightener. In the impeller the air gets, due to the high rotating speed, a very high kinetic energy, which is transformed in the following diffusor into pressure energy. Using a continuously variable throttle at the pressure side, different desired pressure ratios and mass flow rates can be adjusted. In the following cooler the flow with a temperature of 300 degree Celsius will be cooled down before exhausting through a silencer into the environment.

Mechanically, the impeller is driven by two separately excited DC motors which are coupled by a gear box and a pneumatic coupling. Mounting a second gear box and a second coupling on the other side of the motor, it is possible to drive two compressors on this test rig.

Application

Centrifugal compressor development

Literature / References

  • VOGES, M. BEVERSDORFF, M. WILLERT, C. KRAIN, H. APPLICATION OF PARTICLE IMAGE VELOCIMETRY TO A TRANSONIC CENTRIFUGAL COMPRESSOR . 13TH INTERNATIONAL SYMPOSIUM ON "APPLICATIONS OF LASER TECHNIQUES TO FLUID MECHANICS", JUNE 2006, LISBON, PORTUGAL
  • PFISTER, T. BÜTTNER, L. CZARSKE, J. KRAIN, H. SCHODL, R. TURBO MACHINE TIP CLEARANCE AND VIBRATION MEASUREMENTS USING A FIBRE OPTIC LASER DOPPLER POSITION SENSOR . MEASUREMENT SCIENCE AND TECHNOLOGY, 2006, pp.1-13
  • KRAIN,H. HOFFMANN, B. HOMOGENE LAUF-/ LEITRADSTRÖMUNG IM RADIALVERDICHTER . FORSCHUNGSVEREINIGUNG VERBRENNUNGSKRAFTMASCHINEN, HEFT R 532, 2005, pp.67-94
  • KRAIN, H. REVIEW OF CENTRIFUGAL COMPRESSOR'S APPLICATION AND DEVELOPMENT. ASME PAPER GT-2003-38971, p. 11
  • EISENLOHR, G. KRAIN,H. RICHTER, F. A. TIEDE, V. INVESTIGATIONS OF THE FLOW THROUGH A HIGH PRESSURE RATIO CENTRIFUGAL IMPELLER . ASME PAPER GT-2002-30394, p.9
  • KRAIN, H. UNSTEADY DIFFUSER FLOW IN A TRANSONIC CENTRIFUGAL COMPRESSOR. INTERNATIONAL JOURNAL OF ROTATING MACHINERY, VOLUME 8, NUMBER 3, MAY-JUNE 2002, pp. 223-231
  • ORTH, U. EBBING, H. KRAIN, H. WEBER, A. HOFFMANN, B. IMPROVED COMPRESSOR EXIT DIFFUSER FOR AN INDUSTRIAL GAS TURBINE. TRANS. OF THE ASME, JOURNAL OF TURBOMACHINERY, JAN 2002, VOL. 124 pp. 19-26
  • KRAIN, H. UNSTEADY FLOW OF A TRANSONIC CENTRIFUGAL COMPRESSOR. PROCEEDINGS OF THE 15th. INTERNATIONAL SYMPOSIUM ON AIR BREATHING ENGINES , Sept. 2001, p. 9
  • KRAIN, H. KARPINSKI, G. BEVERSDORFF, M. FLOW ANALYSIS IN A TRANSONIC CENTRIFUGAL COMPRESSOR ROTOR USIND 3-COMPONENT LASER VELOCIMETRY. ASME-PAPER 2001-GT-315 p. 9.

Institute / Organization

DLR Institute of Propulsion Technology

Contact

Dr.-Ing. Till Raitor
DLR Institute of Propulsion Technology

Jochen Krampe
Technology Marketing

Dr.-Ing. Alexander Born
Technology Marketing

Dr. Frank Holtmann
Technology Marketing

Similar Measures

Subsequent references to data sheets are given which describe with high probability similar measured values. The selection is made on the basis of semantic affinity:

Total pressures and total temperatures in front of and behind the stage :: more

Mass flow measurement with a standard Venturi tube :: more

Measurement of the rotational speed by trigger signals :: more

Static pressure taps in the compressor casing along the outer contour over the impeller :: more

Three-hole probes :: more

Total pressure probes :: more

Kulite-probes :: more

Static pressures of the compressor and the oil system are measured with a PSI-system :: more

Electric sensor signals like PT 100, Fe-CuNi thermocouple, trigger signals and so on are measured with a DELPHIN TopMessage data acquisition system :: more

4-channel tip clearance measurement with a HYTRON system :: more

Laser-2-focus velocimetry L2F :: more

Particle image velocimetry PIV :: more

Doppler global velocimetry DGV :: more