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Numerical aided design of Pelton nozzle jet deflector [Elektronski vir]
Popovski, Boro P. ; Lipej, Andrej
Hydro energy still occupies an important place among renewable energy sources. In special operating conditions, Pelton turbines are irreplaceable and can be used for extremely small hydropower plants ...and also large hydro power plants. Pelton turbines can operate with high head and relatively small flow rates. In many cases, the height differences of the water are very large. Sometimes,it is necessary to stop the operation of the turbine very quickly,and the consequences of water hammer can be very severe. The part that is responsible forminimizingthe consequences of this phenomena is a jet deflector, which can be in two different technical designs. Steps for 3-D geometry definition, pre-processing and post-processing, flow modelling and FEM analysis are presented. In the paper,anew optimized design is presented of a push-out jet deflector shape. Optimization includes a3-D CFD analysis of free surface flow and a stress analysis. The main goal of the research was to minimize the influence of all the force components on the torque of the deflector servomotor. The final results present the geometry of the deflector with a significant reduction in stresses and deformations. These wereachieved with a crucial reduction in the hydrodynamic force and torque.
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