Abstract
After a short recapitulation of the main problems in wet steam turbines, the goal of the measurements is outlined, namely to determine experimentally as accurately as possible the real expansion line in the wet steam region of a 50 MW condensation turbine.
These experiments embraced measurement of the steam and water flow withdrawn from the turbine in the water draining system and measurement of the steam wetness after the last runner stage. For this purpose a special probe was built in which a small amount of steam was tapped from the main flow and heated up to saturation. The probe was movable over the blade length of the last runner stage and results are given as local steam wetness as a function of the probe position.
A comparison of the results with the findings of modern theory gives some explanation of the experimental facts.
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