Low-Speed Compressor – Institute of Turbomachinery and Fluid Dynamics

Field of Application

Research of aerodynamic effects on neighboring zones
Transition investigation
Investigation of aeroelastic fundamentals

Description

This two-stage compressor operates within a closed-loop circuit. In order to adjust and define the boundary conditions at the compressor inlet, the air temperature can be controlled and set as a constant in the condenser. The stator blades are instrumented with a hot-film array that allows the investigation of transition dependent on the upstream and downstream perturbations induced by the rotor blades. The low ratio of thickness and span of the LSAC allows the research of the fundamentals of aeroelasticity. Piezoelectric actuators are used to excite blade vibrations during the design concept. The rotor blade vibrations can then be measured by means of a strain gauge, and also through the tip-timing system.

Picture - Schematic cross sectional view of the LSAC — Schematic cross sectional view of the LSC

Picture - Schematic assembly of the LSAC-test stand — Schematic assembly of the LSC-test stand

Picture - Blading of the LSAC — Blading of the LSC

Measurement Techniques

Steady and unsteady measurement techniques.
Temperature measurement techniques (Type K and PT100).
Torque shaft measurement techniques.
Acceleration sensors for vibration monitoring.
Hot-film array for wall shear stress measurements.
Radial-periphery pocket with steady and unsteady multi-hole probes behind each stator row.
Radial pocket with steady and unsteady multi-hole probes behind each rotor row.
CTA and CCA probes for measuring velocity vectors and flow field turbulence.
Strain gauge to measure blade vibrations.
Tip timing for blade vibration measurement.

Specifications

Output power	450 kW
Rotational speed	3.000 1/min
Mass flow	16,5 kg/s
Total pressure ratio	1,08
No. Stages	2
Hub ratio	0,63
Thickness-span ratio	0.064 (Hub), 0.043 (Blade tip)
Axial velocity in meridian plane	55,5 m/s