3D-Computation of Incompressible Internal Flows: Proceedings by Gabriel Sottas, Inge L. Ryhming

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 practical incompressible move box in a massive business software. In view of the problems taken with formulating the sort of try case, requiring the supply of an experimental facts base, severe care needed to be taken within the choice of the right kind one. Professor I. L. Ryhming's idea, that the movement via a Francis turbine configuration or components thereof will be possible as a try case, 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 expertise in Lausanne (EPFL), used to be permitted through 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 standards, and so forth. , wherein the layout enter got here from the water turbine specialists. This committee determined to limit the experiences to the 3 following usual functions for the easiest working aspect of the turbine: • simulation of the 3D circulate in a Francis runner in rotation • simulation of the 3D move within the distributor (stay and consultant 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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There is low pressure distribution close to the shroud, leading to an inlet cavity development at the leading edge. Moreover, the strong adverse pressure gradient could lead to a possible flow separation. 5), in order to have a pressure, higher than the atmospheric pressure, on the transducers. The specific hydraulic energy for this test was E "" 58 [Hg-i]. - 05 . ~~:.. 4 ...!.... Q. 1 "'" o , ~;-·-6 oS"~ -. ' ,,~. . , ... 2 mid-span " h~b " ... 5 ~. ". '" . 8 X/R,. 9 Fig. 19 Blade pressure CONCLUSIONS A complete experimental set-up has been developed in order to perform a flow study in a model of a Francis turbine.

1 with solid marks and dashed lines versus the distance along a traverse line from the bottom ring (b = 0) to the head cover (b = 1). The distribution of radial and axial velocities is not uniform along the traverse line, and due to the curvature of the meridional contour of runner, both velocities generally increase at the runner band (b = 0) and decrease at the runner crown (b = 1) except in the boundary layers. Similarly, the distribution of the original meridional and swirl velocities (3) 55 (4) '" has the similar tendency as are shown in Fig.

Kg-m-3] Pa-Pv-pgHs pE [- ] [rad-s-l] 53 NORMALIZATION OF FLOW PROFILE DATA MEASURED AT RUNNER INLET T. Kubota Kanagawa University, Faculty of Mechanical Engineering 3-27-1, Rokkakubashi, Kanagawaku, Yokohama 221, Japan INTRODUCTION Measured flow profiles in a model turbine have inevitable measuring errors even with the most careful measuring technique. It is normal practice, therefore, that the measured data are normalized to conserve discharge, angular momentum and total specific hydraulic energy.

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