Blade-cooling air for a high-pressure turbine is often supplied from preswirl nozzles attached to a stationary casing. By swirling the cooling air in the direction of rotation of the turbine disk, the temperature of the air relative to the blades can be reduced. The question addressed in this paper is: Knowing the temperatures of the preswirl and disk-cooling flows, what is the temperature of the blade-cooling air? A simple theoretical model, based on the Reynolds analogy applied to an adiabatic rotor–stator system, is used to calculate the preswirl effectiveness (that is, the reduction in the temperature of the blade-cooling air as a result of preswirling the flow). A mixing model is used to account for the “contamination” of the blade coolant with disk-cooling air, and an approximate solution is used to estimate the effect of frictional heating on the disk-cooling air. Experiments were conducted in a rotor–stator rig that had preswirl nozzles in the stator and blade-cooling passages in the rotating disk. A radial outflow or inflow of disk-cooling air was also supplied, and measurements of the temperature difference between the preswirl and blade-cooling air were made for a range of flow rates and for rotational Reynolds numbers up to Reθ = 1.8 × 106. Considering the experimental errors in measuring the small temperature differences, good agreement between theory and experiment was achieved.
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October 1989
Research Papers
Preswirl Blade-Cooling Effectiveness in an Adiabatic Rotor–Stator System
Z. B. El-Oun,
Z. B. El-Oun
Thermo-Fluid Mechanics Research Centre, School of Engineering and Applied Sciences, University of Sussex, Falmer, Brighton, BN1 9QT, United Kingdom
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J. M. Owen
J. M. Owen
Thermo-Fluid Mechanics Research Centre, School of Engineering and Applied Sciences, University of Sussex, Falmer, Brighton, BN1 9QT, United Kingdom
Search for other works by this author on:
Z. B. El-Oun
Thermo-Fluid Mechanics Research Centre, School of Engineering and Applied Sciences, University of Sussex, Falmer, Brighton, BN1 9QT, United Kingdom
J. M. Owen
Thermo-Fluid Mechanics Research Centre, School of Engineering and Applied Sciences, University of Sussex, Falmer, Brighton, BN1 9QT, United Kingdom
J. Turbomach. Oct 1989, 111(4): 522-529 (8 pages)
Published Online: October 1, 1989
Article history
Received:
September 15, 1987
Online:
November 9, 2009
Citation
El-Oun, Z. B., and Owen, J. M. (October 1, 1989). "Preswirl Blade-Cooling Effectiveness in an Adiabatic Rotor–Stator System." ASME. J. Turbomach. October 1989; 111(4): 522–529. https://doi.org/10.1115/1.3262303
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