By Gabriel Sottas, Inge L. Ryhming
The objective of the 1989 GAMM Workshop on 3D-Computation of Incompressible inner Flows used to be the simulation of a practical incompressible movement box in a major business software. In view of the problems considering formulating one of these try out case, requiring the provision of an experimental info base, severe care needed to be taken within the collection of the correct one. Professor I. L. Ryhming's notion, that the movement via a Francis turbine configuration or elements thereof will be possible as a try case, as a result of numerical demanding situations in addition to the chance to supply an experimental information base through the use of the experimental amenities of the Hydraulic Machines and Fluid Mechanics Institute (IMHEF) on the Swiss Federal Institute of expertise in Lausanne (EPFL), used to be authorised via the GAMM Committee in April 1987. a systematic committee, shaped lower than the chairmanship of Professor I. L. Ryhming, met a couple of times to settle on the Francis turbine configuration, the try out case necessities, and so on. , wherein the layout enter got here from the water turbine specialists. This committee determined to limit the reports to the 3 following normal functions for the simplest working element of the turbine: • simulation of the 3D circulation in a Francis runner in rotation • simulation of the 3D stream within the distributor (stay and consultant vane earrings) of this turbine • simulation of the 3D stream in an elbow draft tube The simultaneous computation of 2 or 3 of those geometries used to be encouraged.
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Additional info for 3D-Computation of Incompressible Internal Flows: Proceedings of the GAMM Workshop held at EPFL, 13–15 September 1989, Lausanne, Switzerland
The rod diameter is the same as that of the probe outer tube. The guide bearings in the probe passages eliminate mechanical vibrations as far as possible and allow the flow profile to be measured right across the flow channel for relevant head and flow values. Fig. 10 Probe pressure tap arrangement 42 Static pressure measurements Static pressures are measured by a water pressure line scanning system. This system, driven by a micro-computer, uses two Scanivalves connected to an absolute pressure transducer.
The swirl flow angle is circumferentially more inclined at the crown than at the band. The correlation between the dynamic energy and the pressure energy for the original data can be confmned with Fig. 4 in which (7) (8) where Po is the reference pressure for the pressure measurement. Band flow has more dynamic and less pressure energy; vice versa for the crown flow. Finally, the total energy Pt* and the Euler energy e* of the original flow are shown in Fig. 5 in which (9) (10) The total energy Pt '" is more or less constant, though the scatter in the measured data is considerable.
30. 20. 30. FLOW SURVEY INSTRUMENTATION FIVE-HOLE PROBE Design The 6 mm diameter five-hole probe was designed to perform a full traversing survey of the flow in the different stations of interest by giving the 3 components of the local flow velocity and the local static pressure. 5 mm diameter pressure tap holes is the same as that of the United Sensor's probe, see Figure 10. In this case the probe is extended by a rod in order to guide it in the probe passages. The rod diameter is the same as that of the probe outer tube.
3D-Computation of Incompressible Internal Flows: Proceedings of the GAMM Workshop held at EPFL, 13–15 September 1989, Lausanne, Switzerland by Gabriel Sottas, Inge L. Ryhming