Seite - 1378 - in Book of Full Papers - Symposium Hydro Engineering

7. GENERATOR OF MOMENTUM – EJECTOR RAMP A key feature of this installation is the ejector ramp (Fig. 19), whose purpose is to optimize the acceleration of the excess flow. Fig. 19 Section through the ramp with transition to the mixing zone [3] The spillway and ejector ramp in KW Mühltalwehr is covered with steel plates to reduce losses to a minimum and to avoid erosion. Ejector ramps are essentially gravity flow tailraces. For tailraces of this kind, the flow conditions for irregular movement can be calculated using the Strickler method. v=kSt ∙R 2 3⁄ ∙ J1 2⁄ [1] Fig. 20 Ejector ramp – KW Mühltalwehr/Alm with steel covering 1378