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Figure 2: Vibrations during start up. Finally being the peripheral velocity constant along the blade span, the velocity triangles are constant and the blades should be prismatic instead of twisted. Fluid dynamics analysis Having a cross section increasing proportionally to the radius, during the expansion, the radial outflow turbine matches the volumetric flow behavior better than the axial turbines which usually require high flaring angles. This means that it is possible to have lower blade at the last stage, leading to evident mechanical advantages, and higher blades at the first stages, thus to reduce the secondary and leakage losses. For this reason, as initial stages have a better aspect ratio, they do not need partial admission, avoiding additional losses related to this aspect. As a consequence, the possibility to manage higher volumetric flow ratio allows to have an higher pressure at turbine inlet while keeping the same condensing pressure and so giving the possibility to increase the thermodynamic cycle efficiency. Finally, as the enthalpy drop of the fluid is divided on several stages for the single-disk/multi stage configuration, the radial outflow turbine is characterized by subsonic or transonic stages (instead of supersonic ones typical of the other configuration, because of the low speed of sound of organic fluids) having a lower work coefficient resulting in an higher fluid dynamics efficiency both in nominal and off-design conditions (see Figure 3). Spadacini et al. 3PDF Image | The First Geothermal Organic Radial Outflow Turbines
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