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 circulation box in a major commercial software. In view of the problems enthusiastic about formulating this kind of attempt case, requiring the provision of an experimental info base, severe care needed to be taken within the collection of the right kind one. Professor I. L. Ryhming's notion, 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 info 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), was once approved by way of the GAMM Committee in April 1987. a systematic committee, shaped below the chairmanship of Professor I. L. Ryhming, met once or twice 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 reviews to the 3 following normal functions for the easiest 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 advisor vane jewelry) of this turbine • simulation of the 3D stream in an elbow draft tube The simultaneous computation of 2 or 3 of those geometries was once encouraged.
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Extra info for 3D-Computation of Incompressible Internal Flows: Proceedings of the GAMM Workshop held at EPFL, 13–15 September 1989, Lausanne, Switzerland
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.
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. DISCHARGE CONTINUITY The discharge that is computed by integrating the radial/axial velocities along a traverse line may usually differ from the discharge accurately measured by the flowmeter, mainly due to the non-axi-symmetric nature of the flow in the spiral case.
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. These values show that even at the best efficiency point the blade loading is far from optimal.
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