By Gabriel Sottas, Inge L. Ryhming
The goal of the 1989 GAMM Workshop on 3D-Computation of Incompressible inner Flows used to be the simulation of a practical incompressible circulation box in a tremendous commercial program. In view of the problems desirous about formulating one of these attempt case, requiring the supply of an experimental info base, severe care needed to be taken within the collection of the right kind one. Professor I. L. Ryhming's idea, that the circulate via a Francis turbine configuration or components thereof will be possible as a try case, as a result of numerical demanding situations in addition to the chance to supply an experimental facts 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 by means of 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 choose 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 made up our minds to limit the reports to the 3 following regular purposes for the easiest working element of the turbine: • simulation of the 3D circulate in a Francis runner in rotation • simulation of the 3D circulate within the distributor (stay and advisor vane earrings) of this turbine • simulation of the 3D circulate in an elbow draft tube The simultaneous computation of 2 or 3 of those geometries was once 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
Unfortunately the large random flow instabilities did not allow to carry out precise velocity measurements with the probe. Nevertheless, wall pressure measurements were made at this section. 40 -r-- ........ 00 -I-- .... 40 V ..... (lOSO o 40 20 80 60 1 100 1 120 140 Fig. 30 ICone I r----. A -"" ....... t -. J 1\ \ Yl +ep .... Cr ... Cu .... Cz ~ ..... ~ t.. 3S r· ·1 Fig. 18 Flow survey at the cone section PRESSURE DISTRIBUTION IN THE RUNNER The distribution of pressure coefficient along three theoretical streamlines close to, hub, shroud, and that corresponding to a midspan position is given in Figure 19, which represents only the second series of measurements in order to have a better readability.
Horizontal cross-section levels and theoretical streamlines in the meridional view V///I//V"~ /\ I 10 /llili/~~ I V J I I / / / / / N'~ 1\ I I I I I I 11///'IV/' /I 'I. f+t-++-lf-f--Yt-r--'i:::=*4 10 5 0 5 x Top view pressure side Fig. 2 Top view suction side Runner blade horizontal cross-sections FLow SURVEY SYSTEM More than 60 probe passages in the model were planned in order to perform a complete flow survey. They are placed at the stayring inlet, at the runner inlet and outlet, and in a cross-section of the plexi-glass cone.
The corresponding calibration curves are given in Figure 12 as contoured surfaces of Hand L values in a versus 9 graph. - '----. -----, - 50 -50 , ,""""" ",,' -25 ,'-.. 12 Calibration sUrfaces o/the total and static pressure It is to be noted that, these strongly contoured curves represented in Figures. 11 and 12 are repetetive and the interpolated values are to be really read on the curves by successive approximation. During the flow survey, the corresponding pressure values allow us to compute the F and G coefficients in order to find a corresponding pair of <1>, e angles.
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