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Int. J. Turbomach. Propuls. Power 2017, 2(3), 15;

The Effect of Hot Streaks on a High Pressure Turbine Vane Cascade with Showerhead Film Cooling

Department of Engineering and Applied Sciences, University of Bergamo, 24044 Dalmine, Italy
This paper is an extended version of our paper in Proceedings of the European Turbomachinery Conference ETC12, 2017, Paper No. 44.
Author to whom correspondence should be addressed.
Academic Editor: Tony Arts
Received: 10 May 2017 / Revised: 5 September 2017 / Accepted: 6 September 2017 / Published: 13 September 2017
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Hot streak migration in a linear vane cascade with showerhead film cooling was experimentally and numerically investigated at isentropic exit Mach number of Ma2is = 0.40, with an inlet turbulence intensity level of Tu1 = 9%. Two tangential positions of the hot streak center were taken into account: 0% of pitch (hot streak is aligned with the vane leading edge) and 45% of pitch. After demonstrating that computations correctly predict hot streak attenuation through the vane passage with no showerhead blowing, the numerical method was used to investigate hot streak interaction with showerhead film cooling, at blowing ratio of BR = 3.0, corresponding to a coolant-to-mainstream mass flow ratio of MFR = 1.15%. The effects of mixing and coolant interaction on the hot streak reduction were interpreted under the light of the superposition principle, whose accuracy was within 12% on the leading edge region, in the central section of the vane span. View Full-Text
Keywords: hot streak; first stage vane; showerhead film cooling hot streak; first stage vane; showerhead film cooling

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Barigozzi, G.; Mosconi, S.; Perdichizzi, A.; Ravelli, S. The Effect of Hot Streaks on a High Pressure Turbine Vane Cascade with Showerhead Film Cooling. Int. J. Turbomach. Propuls. Power 2017, 2, 15.

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