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y Θ z x r Figure 2.2.: It is convenient to apply a cylindrical coordinate system when describing the geometry of a radial turbine, since the impeller is rotating about an axis. vane row. It is in the rotor, usually called the impeller, where the fluid is turned while expanding and thereby exerting work on the blades which forces the shaft to rotate. From inlet to outlet there is a dramatic change in radius and that is, together with the turning, what signifies the radial turbine. The fluid enters the radial turbine through the volute (inlet scroll) in a direction which is perpendicular to the rotor vanes and is distributed equally around the perphery. The purpose of the volute is to turn the flow toward the rotor vanes. Ideally, this is done while maintaining a uniform static pressure and mass flow at the volute exit, otherwise the impeller might be exposed to unsteady radial loading. The volute can be of double entry type, which means that instead of being distributed around a perphery of 360◦, two streams contributes 180◦ each. Ultimately, there will be some fluid which recirculates and mixes with the incoming fluid. From the volute, the fluid is approaching the stator vanes1. The nozzle vanes are dis- tributed around the periphery in an annular ring which encloses the rotor and they are used to continue the turning started in the volute. The shape of the nozzle vanes can differ but generally they can be divided into three common groups based on the blade camber angle. The vanes can be designed with no camber (straight blades), with nega- tive camber (yielding concave blades) and with positive camber (yielding convex blade). 1The stator vanes are often referred to as nozzle vanes 6PDF Image | A Detailed Analysis of Radial Turbines
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