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Unsteady wetness effects in low pressure steam turbines

Kane Chandler (Energy)

 

One of the unresolved issues for condensing flow in large steam turbines is correct prediction of the droplet size distribution. Optical measurements taken in the later stages of LP steam turbines have shown that the time-averaged droplet size spectra are much broader with larger average diameters than predicted by most theoretical and computational methods. Previous work has suggested that the broad distributions might stem from unsteadiness created by the interaction between successive blade rows – the so-called ’wake-chopping’ effect. The current results of multi-stage 3D CFD calculations aimed at investigating the impact of such unsteadiness on the condensation process support this hypothesis.

 

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