Within the research programs at the Institute for Thermal Turbomachinery and Machine Dynamics, in 1995 design and building of a transonic test turbine facility was started. In November 1999 the turbine test facility was run for the first time. This facility is driven by a compressor station of 3 MW power and allows testing of transonic gas turbine stages in full flow similarity. The test stand gives access of conventional pressure and temperature probes as well as of optical measurement devices such as Laser-Doppler-Velocimetry (LDV) and Particle-Image-Velocimetry (PIV) systems. Changing demands from research projects resulted in several modifications. Since the commissioning hundreds of hours of test runs with many different transonic turbine stages were performed.
The following picture shows the main component of the facility. Pressurized air, delivered by a separate electrically driven compressor station with 3 MW power, is fed to the turbine stage to be tested. The test turbine drives the brake compressor shown at right. The pressurized air from the brake compressor can be added to the air from the compressor station in a mixing chamber. The air from the compressor station may be cooled to about 50 °C, whereas the temperature of the brake compressor air depends on the pressure ratio. The exhaust air from the turbine normally flows through an exhaust line directly to the silencers in the exhaust tower. Optionally a suction blower driven by a 750 kW engine (previously a helicopter engine) may be inserted into the exhaust line to reduce the turbine back pressure and thus increase the turbine overall pressure ratio.
Mechanical and Operational Features:
In the download section you can find some publications regarding the details, design and construction of the TTTF as well as results of some tests.
Institute of Thermal Turbomachinery and Machine Dynamics
Graz University of Technology
Tel: +43 (0)316 873 - 7226
Fax: +43 (0)316 873 - 107226