Construction of a single-stage Air Test Turbine „MONA“Copyright: © IKDG
The main component of the turbine test rig is the single-stage 1.1 MW air test turbine MONA. Due to the high modularity, it is possible to exchange the bladed turbine disk, the gas housings, as well as the nozzle and cover rings. This favours the variation of flow parameters, as well as good accessibility to instrumentation. The turbine shaft is mechanically coupled to a water vortex brake via a gearbox. This serves as a power sink, for speed control and via a torque measurement together with a speed measurement for power determination. The MONA turbine test rig shares the infrastructure of the former JOHANNA foundation with the MIGH turbine test rig.
The test bench is equipped with the following instrumentation:
- static wall pressure
- one pressure measurement plane in the air inlet and one pressure measurement plane in the air outlet
- 8 static wall pressure measuring points are distributed circumferentially symmetrically on the outer diameter in each plane.
- three pressure measuring planes in the turbine casing, one each upstream of the guide vanes, downstream of the rotor blades and at the cowl outlet
- In each plane, 8 static wall pressure measuring points are distributed circumferentially on the hub diameter and 8 static wall pressure measuring points on the outer diameter.
- Pressure crossheads
- Two radially movable pressure crossheads in the air inlet measuring plane and two radially movable pressure crossheads in a plane in front of the guide vanes.
- The possibility of implementing one pressure traverse each between the guide vanes and moving vanes and after the moving vanes is currently being evaluated.
- Wall temperature
- one temperature measuring level in the air inlet with 8 measuring points and one temperature measuring level in the air outlet with 4 measuring points
- Wall temperature measuring points are distributed circumferentially symmetrically in each plane.
- Tip Timing measuring system
- Tip Timing measuring probes in the area of the moving blades
- The sensors are connected to the institute's own measuring system.
- Two inductive sensors to determine the rotational speed.
- The measurement is carried out on the turbine shaft directly in front of the turbine disk and on the water brake shaft at the last bearing block.
- two measuring devices for determining the torque
- In the turbine shaft, the torque is determined via 2 strain gauge full bridges with temperature compensation.
- At the pendulum housing of the water brake, the torque is determined via two redundant load cells.
Technical design data
|Max. Mass Flow
Max. Inlet Temperature
Max. Inlet Pressure
|Min. Hub Diameter||mm||185||200|
Max. Outer Diameter for Tip Timing