Page - 1371 - in Book of Full Papers - Symposium Hydro Engineering

5. SCIENTIFIC AND RESEARCH BACKGROUND In 2013 a scientific research project was started by ZT-Fritsch GmbH in collaboration with TU Graz – Institute HFM (Prof. Dr. Jaberg). 1.1. EXPERIMENTAL INVESTIGATION In order to achieve an experimental investigation close to reality the substantial parts of the reference power plant WAIDHOFEN were replicated using a scale model (M = 1:10). The three dimensional CAD-model of the designed test rig is shown in Fig. 9. The water delivered by the main pump of the test rig enters the open headwater tank (2) via the inlet pipe (1). With the help of the turbine pipe section (3) a part of the water QTu is directed to the draft tube of the turbine (4). The other part of the water flow QEj is regulated by an ejector gate (6) and runs in the ejector chute (5) to the mixing zone (7). Fig. 9 Three-dimensional view of the CAD-model of the ejector test rig [4] 1371