Session: 06-09 Advanced Simulation & Testing

Paper Number: 126277

126277 - Calculation of the Overspeed at Emergency Shutdown of a Transonic Test Turbine Facility Using a Web-Based Thermodynamic Simulation Tool 

The Institute of Thermal Turbomachinery and Machine Dynamics at Graz University of Techology operates a Transonic Test Turbine Facility of 3 MW power. The test turbine is a two-spool two-stage turbine. The first high-speed stage is connected to a brake compressor via a coupling, whereas the second low-speed stage is connected to a water brake.

In the case of a coupling break or a break-off of the water brake, an emergency shutdown is triggered in order to avoid excessive overspeed of the turbine stages leading to blade dismantling or even disk bursting. For a previous one-stage set-up, the test-rig was thermodynamically modelled and dynamically simulated to calculate the occurring maximum speeds. The results were evaluated by shutdown tests allowing to find the correct model parameters. By this approach a safe operation of the test rig shall be guarantueed.

In this work, for the existing two-spool two-stage test rig a simulation model is presented. With a dynamic simulation the overspeeds of the high-speed and low-speed shafts are calculated for the cases of coupling break and water brake brake break-off as well as for the case of both shafts running freely. In this way, it is checked that the maximum speeds of the shafts in the case of emergency are within the allowable limits.

For the modeling and simulation, the newly developed web-based version of the thermodynamic simulation tool IPSEpro was used.

Presenting Author: Wolfgang Sanz Graz University of Technology

Presenting Author Biography: Professor at Graz University of Technology

Authors:

Wolfgang Sanz Graz University of Technology
Erhard Perz SimTech Simulation Technology
Emil Göttlich Graz University of Technology