By Gabriel Sottas, Inge L. Ryhming
The objective of the 1989 GAMM Workshop on 3D-Computation of Incompressible inner Flows was once the simulation of a practical incompressible circulate box in a big commercial software. In view of the problems inquisitive about formulating any such attempt case, requiring the provision of an experimental info base, severe care needed to be taken within the choice of the correct one. Professor I. L. Ryhming's suggestion, that the circulation via a Francis turbine configuration or elements thereof will be possible as a attempt case, as a result of numerical demanding situations in addition to the chance to provide an experimental info 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 accredited 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 settle on the Francis turbine configuration, the try out case necessities, 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 general purposes for the easiest working element of the turbine: • simulation of the 3D stream 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 movement 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
In contrast to the F coefficient the G coefficient is not well-defined for the value of the yaw angle greater than 15° or smaller than -15". L 9- s- 01 C 01 C CII 25 CII C ~ c 25 C 0 >- -25 o 25 50 pitch angle e [deg] -50+---~~---+-----r--~ -50 -25 0 25 pitch angle 50 e [deg] Fig. 11 Calibration sUrfaces of the yaw and pitch angles 43 In addition, the coefficients Hand L can be defined as functions of the static pressure po and the total pressure pI. The corresponding calibration curves are given in Figure 12 as contoured surfaces of Hand L values in a versus 9 graph.
A ........ / .... Curvilinear abscissa [mm] - o 20 40 60 I I 80 100 Fig. 072, respectively, and the guide-vane opening angle IX is 25". Stay ring inlet Data corresponding to the flow survey at the stayring inlet is given in Figure 16. Static and total pressure coefficients Cp and Cpt and coefficients corresponding to the three flow velocity components are provided versus the traversing axis coordinates. Three sets of curves are given for a e value of 175", 265" and 355", respectively. Owing to the influence of the fillet the flow is quasi two-dimensional, the Cz component being zero and the radial component remaining constant all along the periphery.
2 ' With these reference values, the problem of the poor draft-tube behaviour which gave an unusual hillchart with two peaks is solved. Thus, the modified energy coefficient ",ref and the efficiency were computed using this reference station, and are reported as a function of the discharge coefficient in the hillchart in Figure 7. 25°. 88 I ! 1 Fig . 20 Fig . 9 Photography of the inlet edge cavitation development at the best efficiency operating point 41 CAVITATION The cavitation behaviour of the runner is also very interesting since it provides a rough idea of the pressure distribution in the runner.
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