The thesis describes an experimental investigation of nucleating steam flows over cascades of steam turbine blading in which the characteristics of two different profiles one a nozzle and the other a rotor blade have been studied. The literature survey covers the development of nucleation theory and its application to steam flows. This is followed by the development of equations describing two-dimensional flows of nucleating steam and the description of a numerical method for their treatment using the time marching technique. The description of a short duration steam tunnel and data acquisition system suitable for the study of nucleating flows is given next. The instrumentation caters for surface pressure measurements and wake traversing downstream of the cascade. Optical arrangements for Mach Zehnder and shadowgraphy and droplet measurements by light extinction method are also included. The experimental observations have been carried out for superheated and supercooled steam flows. The measurements have been repeated for a series of overall pressure ratios covering subsonic to supersonic outlet conditions. The comparisons show features exhibited by nucleating tests which are absent from the tests in which the steam is dry.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:643567 |
| Date | January 1991 |
| Creators | Ebrahimi, M. |
| Publisher | University of Birmingham |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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