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 move box in a massive business program. In view of the problems all in favour of formulating this kind of attempt case, requiring the provision of an experimental info base, severe care needed to be taken within the number of the right kind one. Professor I. L. Ryhming's idea, that the circulate via a Francis turbine configuration or elements thereof will be possible as a attempt case, end result of the numerical demanding situations in addition to the prospect to provide an experimental information base by utilizing 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 below the chairmanship of Professor I. L. Ryhming, met a couple of times to choose the Francis turbine configuration, the try out case requisites, and so forth. , wherein the layout enter got here from the water turbine specialists. This committee made up our minds to limit the experiences to the 3 following usual 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 consultant 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 was once 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
S~ "ilc =0 'ii i: .. ------- .. -:---------- ! PRESSURE MEASUREMENTS IN THE RUNNER The miniature absolute pressure transducers embedded in the runner blades are a Kyowa's resistive bridge-type PS-2KA model. 6 mm. respectively. The pressure range is 2 x lOSPa and the mean sensitivity 900 IlVN. It should be noticed that the pressure should be always higher than the atmospheric pressure in order to avoid the destruction of transducers. The multiplexed bridge signal is voltage to frequency converted in order to be transmitted through a coil mounted on the rotating shaft.
5, 33 purposes in order to perform experimental flow studies. A Piguet-type spiral case was designed to give a constant meridional velocity distribution. A fillet was added on both sides of the stayring inlet in order to assure well-defined inflow conditions. The stayring consists of 24 stay-vanes and the distributor of 24 guide-vanes. 5' respectively, see Figure 1. A mechanical encoder provides a readout of the guide vane opening angle a. 37', as indicated in Figure 1, the opening angle a is related to the guide vane angle as follows : The runner has 13 blades, each individually casted in epoxy resin reinforced with carbon fiber.
32 ~1! ~..... j . lI.. j ..................... , ");':'" ! - '::'"c,+•... ; .....! •.. 8 1 Distance along traverse from band b 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