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Ringgitterprüfstand Göttingen (RPG)
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Non-Rotating Annular Test Facility Göttingen (RPG)



General data

  • Task: Aeroelastic investigations (flutter, aerodynamic excitation) of compressor and turbine blades.
  • Location: Institute of Aeroelasticity, Göttingen
  • Design and initial deployment: Ecole Polytechnique Fédérale de Lausanne (LTT)

 

 

Technical data

Technische Skizze RPG

 

  • Test section for annular cascade with subsonic and transonic compressor or turbine blading
  • Outer diameter of the measuring section: 400 mm
  • Blade height: 40 mm 
  • Max. inlet Mach number: 1.3 for compressor cascades
  • Max. outlet Mach number: 1.7 for turbine cascades
  • Max. mass flow: 12 kg/s
  • Investigations of non-rotating annular cascade: realistic inlet flow conditions of the blades (7) by radial-axial deflection with pre-swirl in the radial nozzle (5,6)
  • Electromagnetic excitation of the blades to controlled oscillations in magnitude and phase
  • Aerodynamic probe measurement up and downstream the annular cascade 
  • Simple instrumentation of the non-rotating annular cascade 
  • Aerodynamic excitation and vibration response measurements (forced response) by optional rotating struts upstream of the annular cascade

 

 

Application areas

  • Development and optimization of new blade profiles to increase energy efficiency of aircraft engines  and power generation turbines
  • Aeroelastic investigations of blade profiles for  aircraft engines and stationary gas and steam turbines
    • Experimental flutter investigations of compressor and turbine airfoils
    • Experimental investigations of aerodynamic excitation and forced vibration response of turbine and compressor airfoils
  • Unsteady pressure distribution measurements on the airfoil surfaces using built-in pressure sensors (improved spatial resolution possible due to non-rotating conditions)
  • Optical flow measurements and visualization through simple and permanent optical accessibility (no trigger needed at a specific rotation position)

 

 

Literature

  • Bölcs, A., 1983. A Test Facility for the Investigation of Steady and Unsteady Transonic Flows in Annular Cascades. ASME Paper 83-GT-34
  • Belz, J., Hennings, H., 2006. Experimental Flutter Investigations of an Annular Compressor Cascade: Influence of Reduced Frequency on Stability. K.C.Hall, R.E.Kielb, J.P.Thomas (Eds.): Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines, Springer, pp.77—91
  • Belz, J., Hennings, H., Kahl, G., 2010. Experimental Investigation of the Forcing Function and Blade's Forced Pitching Oscillations of an Annular Compressor Cascade in Transonic Flow. ASME Paper GT2010-23590
  • Chenaux, V.A., 2012. Experimental Investigation of the Aeroelastic Stability of an Annular Compressor Cascade at Reverse Flow Conditions. Ecole Polytechnique Fédérale de Lausanne, Thèse No 5358

 


Contact
Dr.-Ing. Joachim Belz
Teamleader Aeroelastic of Turbomachinary

German Aerospace Center

Institute of Aeroelasticity

Göttingen

Tel.: +49 551 709-2897

Fax: +49 551 709-2862

RPG Documents
Factsheet Non-Rotating Annular Test Facility Göttingen (RPG) (0.29 MB)
RPG News

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