Seite - 1380 - in Book of Full Papers - Symposium Hydro Engineering

8. ENERGY CONVERSION – MIXING ZONE Here the core principle of increased head achieved by the ejector comes into play. The analytic approach is based on the equation of energy and the law of momentum Fig. 22 Section of the ramp with mixing zone [3] The above scheme (Fig. 22) shows the special configured mixing zone for energy conversion with head increasing effect. Starting from the energy level, available at the end of the ramp, out of the momentum Pulse current (IE) = mass flow (ρ ∙QE) · velocity vector (vE) a power transmission occurs to the existing tailrace water with the water flow from the turbine draft tube. In this application it is important to utilize the acceleration effect on the ramp, or in other words to further accelerate the volume of water entering the sluice by minimizing surface roughness on the ramp until the water is reunited with the head race water. Fig. 23 Influence of ramp gradient [3] The above sketches (Fig. 23) show the speed and momentum components on the end of the ejector ramp, linked to the gradient. 1380