Abstract
This article deals with the development of a laminar thin film at the outlet area of a disk turbine. The increasing relative velocities at the outlet -caused by the expansion of the working fluid and the reduction of the cross- section area- are reducing the turbine efficiency, resulting in a lower power output and a higher fuel consumption. To overcome this, a certain amount of the working fluid shall condensate at the disk wall propagating a laminar thin film. Within the liquid film higher shear forces will be transported and therefore the power transfer to the disk optimized. Furthermore, and most important, due to the differences in the specific volume between the liquid and the gaseous phase, the volume flow of the gaseous phase is reduced and therefore the relative velocities are effectively reduced, resulting in a higher turbine efficiency.
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