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IBN-Halle, Testbed 2 Radial Compressor

The centrifugal compressors from GHH (Gutehoffnungshütte in Oberhausen, today MAN Diesel & Turbo SE) used in the test field can be operated open or in a cooled circuit. It is possible to use impellers up to 400 mm Ø and diffusers of various designs up to 630 mm Ø.  The operating point can be set by means of throttle elements in the discharge line and a standardized flow measuring section. The drive of each coupled compressor is provided by a thyristor-controlled DC motor with a power Pelof 375 kW and stepless speed adjustment up to N max = 4,000 rpm.The drive power is transmitted to the centrifugal compressors via a planetary gearbox from Krupp-Stoeckicht (make BHS) and a curved-tooth and shift coupling.The speed Nof the RV 2-1 centrifugal compressor is 16,000 to 30,000 rpm. At present, a 3D-twisted impeller with a diameter of 250 mm is installed, followed by a plate diffuser. The RV 2-2 centrifugal compressor is used within the student laboratory for map measurement.  It is operated at N = 7,000 to 14,000 rpm, contains a prismatic impeller (Da= 315 mm) and a plate diffuser. Both inlet and outlet as well as the plate diffuser are equipped with temperature and pressure measuring points.

Technical Data


BOCHRAD I (state variables at design point)

  • Speed: 17,115 rpm


Geometry (BOCHRAD I)

  • 13 backward-curved, twisted blades (3D) -impeller outer diameter: 315 mm
  • currently no diffuser installed


BOCHRAD II (state variables at design point)

  • total stage pressure ratio: 1.35
  • reduced mass flow: 1.61 kg/s - speed: 14,000 rpm.


Geometry (BOCHRAD II)

  • 17 backward curved prismatic blades (2D)
  • inlet diameter: 183.7 mm
  • Impeller outer diameter: 315 mm
  • plate diffuser, outer diameter 630 mm


prime mover

  • thyristor controlled DC motor
  • oscillating supported
  • maximum power:
  • 375 kWmaximum
  • speed: 4000 rpm


gearbox

  • planetary gear
  • Gear ratios

BOCHWHEEL I1 : 7.53
BOCHRAD II1 : 4 maximum output speeds
BOCHRAD I30.000 rpm
BOCHRAD II16.000 rpm


Operating modes

  • open or intercooled, closed loop SYSTEM
  • mass flow measuring orifice according to DIN EN ISO 5167
  • Torque measuring scale
  • inductive speed measurement
  • throttle valves on suction side
  • variable compressor inlet temperature by heat exchanger
  • flow straightener and long inlet section for homogeneous impeller inlet flow - throttle valves on discharge side

 

MEASUREMENT TECHNOLOGY stationary:

  • stationary map measurement technology (total temperature, total pressure)
  • Ring - wall pressure bores
  • wall pressure bores in casing above impeller
  • Wall pressure bores in diffuser
  • Pitot probe at inlet and outlet

 

 

Radial Compressor Testbed 2
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Radial Compressor Testbed 2
Panorama Grube 2
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Panorama Grube 2
Measuring Technology Set up Testbed 2
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Measuring Technology Set up Testbed 2
Testbed 2 T-Junction
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Testbed 2 T-Junction