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Novel high-pressure turbine purge control features for increased stage efficiency
Kalfas, Anestis I.
Abhari, Reza S.
auf dem Kampe, Tilmann
Prabhu, Sanjay B.
- Journal Article
Rim seals throttle flow and have shown to impact the aerody- namic performance of gas turbines. The results of an exper- imental investigation of a rim seal exit geometry variation and its impact on the high-pressure turbine flow field are presented. A one-and-a-half stage, unshrouded and highly loaded axial tur- bine configuration with 3-dimensionally shaped blades and non-axisymmetric end wall contouring has been tested in an axial turbine facility. The exit of the rotor upstream rim seal was equipped with novel geometrical features which are termed as purge control features (PCFs) and a baseline rim seal geometry for comparison. The time-averaged and unsteady aerodynamic effects at rotor inlet and exit have been measured with pneu- matic probes and the fast-response aerodynamic probe (FRAP) for three rim seal purge flow injection rates. Measurements at rotor inlet and exit reveal the impact of the geometrical features on the rim seal exit and main annulus flow field, highlighting regions of reduced aerodynamic losses induced by the modified rim seal design. Measurements at the rotor exit with the PCFs installed show a benefit in the total-to-total stage efficiency up to 0.4% for nominal and high rim seal purge flow rates. The work shows the potential to improve the aerodynamic efficiency by means of a well-designed rim seal exit geometry without losing the potential to block hot gas ingestion from the main annulus Show more
Journal / seriesJournal of the Global Power and Propulsion Society
Subjectpurge flow; turbine efficiency; hub cavity; rim seal
Organisational unit03548 - Abhari, Reza S.
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