By Gabriel Sottas, Inge L. Ryhming
The goal of the 1989 GAMM Workshop on 3D-Computation of Incompressible inner Flows was once the simulation of a pragmatic incompressible circulate box in a big business program. In view of the problems serious about formulating any such try case, requiring the supply of an experimental facts base, severe care needed to be taken within the choice of the correct one. Professor I. L. Ryhming's idea, that the move via a Francis turbine configuration or components thereof will be possible as a try out case, 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 know-how in Lausanne (EPFL), was once approved by way of the GAMM Committee in April 1987. a systematic committee, shaped less than the chairmanship of Professor I. L. Ryhming, met a couple of times to settle on the Francis turbine configuration, the try out case standards, and so on. , wherein the layout enter got here from the water turbine specialists. This committee made up our minds to limit the reports to the 3 following average functions for the easiest working element of the turbine: • simulation of the 3D move in a Francis runner in rotation • simulation of the 3D stream within the distributor (stay and advisor vane earrings) of this turbine • simulation of the 3D circulation in an elbow draft tube The simultaneous computation of 2 or 3 of those geometries used to be encouraged.
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Additional resources for 3D-Computation of Incompressible Internal Flows: Proceedings of the GAMM Workshop held at EPFL, 13–15 September 1989, Lausanne, Switzerland
Part 2 EXPERIMENTAL RESULTS EXPERIMENTAL FLOW STUDY OF THE GAMM TURBINE MODEL Franyois Avellan, Philippe Dupont, Mohamed Farhat, Bernard Gindroz, Pierre Henry, Mahmood Hussain, Etienne Parkinson, Olivier Santal EPFL, Institut de Machines Hydrauliques et de Mecanique des Fluides 33, avenue de Cour, CH 1007 Lausanne, Switzerland SUMMARY An experimental study of flow in a Francis hydraulic turbine, especially designed for the GAMM Workshop, has been carried out. In order to provide a data base for the validation and comparison of computational fluid dynamics codes, a Francis turbine model and adequate instrumentation have been specially developed.
1, 56 corresponding to a reduction of centrifugal force. On the contrary, the original axial velocity c; in the layer is a little decelerated as shown in Fig. I. 3). The swirl flow angle Fig. 3 and the Euler energy e* in Fig. 5 for the original flow clearly show the effect of boundary layers near walls. There is no boundary layer distortion in the pressure energy distribution (Fig. 4) and within the measurement uncertainty in the total energy distribution (Fig. 5). These effects of boundary layers shall be removed by extrapolating the tendency of the main flow profile into the boundary layer regions.
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. The Euler energy (flow circulation) e* is higher at the band than at the crown. EFFECT OF BOUNDARY LAYERS Among the three velocity components of the original flow, the amount of swirl velocity * is the largest. Therefore, the effect of deceleration in the boundary layers due to friction Cu becomes also large for the original swirl flow as shown in Fig.
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