Three-dimensional steady multistage calculations, using the mixing plane approach, are compared with experimental measurement in a low-speed three-stage model turbine. The comparisons are made with two levels of shroud seal clearance, one representative of a real turbine and one with minimal seal clearance and almost no shroud leakage. Three different calculations are compared. The first computes the main blade path with no modeling of shroud leakage. The second includes a simple model of shroud leakage using sources and sinks on the end-walls, and the third is a multiblock calculation with all leakage paths and cavities computed. It is found that neglect of shroud leakage makes the computed velocity profiles and loss distributions significantly different to those measured. Simple modeling of shroud leakage gives some improvement but full calculation of the leakage flows and cavities is necessary to obtain good agreement between calculation and measurement.
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October 2006
Technical Papers
The Importance of Shroud Leakage Modeling in Multistage Turbine Flow Calculations
John D. Denton,
John D. Denton
Whittle Laboratory,
Cambridge University
, Cambridge CB3 0DY, UK
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Graham Pullan
Graham Pullan
Whittle Laboratory,
Cambridge University
, Cambridge CB3 0DY, UK
Search for other works by this author on:
Budimir Rosic
John D. Denton
Whittle Laboratory,
Cambridge University
, Cambridge CB3 0DY, UK
Graham Pullan
Whittle Laboratory,
Cambridge University
, Cambridge CB3 0DY, UKJ. Turbomach. Oct 2006, 128(4): 699-707 (9 pages)
Published Online: September 6, 2005
Article history
Received:
August 30, 2005
Revised:
September 6, 2005
Citation
Rosic, B., Denton, J. D., and Pullan, G. (September 6, 2005). "The Importance of Shroud Leakage Modeling in Multistage Turbine Flow Calculations." ASME. J. Turbomach. October 2006; 128(4): 699–707. https://doi.org/10.1115/1.2181999
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