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

By Gabriel Sottas, Inge L. Ryhming

The target of the 1989 GAMM Workshop on 3D-Computation of Incompressible inner Flows was once the simulation of a practical incompressible stream box in a massive commercial software. In view of the problems considering formulating any such try case, requiring the supply of an experimental info base, severe care needed to be taken within the choice of the right kind one. Professor I. L. Ryhming's notion, that the circulation via a Francis turbine configuration or components thereof will be possible as a attempt case, as a result numerical demanding situations in addition to the prospect to provide 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 know-how in Lausanne (EPFL), used to be permitted through the GAMM Committee in April 1987. a systematic committee, shaped less than the chairmanship of Professor I. L. Ryhming, met a couple of times to settle on the Francis turbine configuration, the attempt case standards, 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 common functions for the simplest working aspect of the turbine: • simulation of the 3D movement in a Francis runner in rotation • simulation of the 3D move within the distributor (stay and consultant vane jewelry) of this turbine • simulation of the 3D circulate in an elbow draft tube The simultaneous computation of 2 or 3 of those geometries used to be encouraged.

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3D-Computation of Incompressible Internal Flows: Proceedings of the GAMM Workshop held at EPFL, 13–15 September 1989, Lausanne, Switzerland

The purpose of the 1989 GAMM Workshop on 3D-Computation of Incompressible inner Flows was once the simulation of a pragmatic incompressible circulate box in an incredible commercial software. In view of the problems excited about formulating this sort of attempt case, requiring the supply of an experimental info base, severe care needed to be taken within the collection of the correct one.

Extra resources for 3D-Computation of Incompressible Internal Flows: Proceedings of the GAMM Workshop held at EPFL, 13–15 September 1989, Lausanne, Switzerland

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C· 6> Fig . s~1 cosesm~ sine Velocity component in the probe frame of reference. : p + gZI - nref = -gZref p in order to compute the static pressure and total pressure coefficients, Cpo (probe) and CPt(probe) are defined as : Cpo(probe) = po E-pref and Cpt(probe) = pt -EPref . p k P k Then the actual coefficient values are deduced by using the corresponding pair of kinetic energy term Ek and the specific energy E provided by the test rig panel control. Hence the coefficients are Ek Cpo = Cpo(probe) E Ek and Cpt = CPt(probe) E .

Where Pt and Pt2 are the mass averaged total energies at inlet and outlet of the runner calculated as follows: • Pt f. (J = (p* + c 02 ) 2nR(C;dZ + C; dR) (15) Q The elh * calculated from the original flow profile data has the following value: ". 920. The normalized total energy level shall be smaller than the original. 58 NORMALIZATION Since no information is available for the theoretical main flow profile as well as the boundary layer growth along the walls, a trial and error approach shall be applied for the normalization of the original flow profile data measured at the GAMM runner inlet.

Requirement 2 averaged c;, cR' ce, ci, and a along the draft tube inlet measurement axis versus the normalized arclength along the measurement axis. Npa number of points per measurement axis {R, ZlNpa cylindrical coordinates of the measurement points normalized arclength corresponding to every measurement point averaged normalized pressure coefficient at each measurement point 29 {(cR)ay,(ca)ay,(CVay }Npa averaged nonnalized velocity components at each measurement point absolute flow angle corresponding to the averaged velocity components Note that: Npa and {R, Z}Npa are part of the given measured data.

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