Mainstream aerodynamic effects due to wheelspace coolant injection in a high-pressure turbine stage: Part I - Aerodynamic measurements in the stationary frame

C. McLean, C. Camci, B. Glezer

Research output: Contribution to journalArticlepeer-review

88 Scopus citations

Abstract

The relative aerodynamic and performance effects associated with rotor-NGV gap coolant injections were investigated in the Axial Flow Turbine Research Facility (AFTRF) of the Pennsylvania State University. This study quantifies the effects of the coolant injection on the aerodynamic performance of the turbine for radial cooling, impingement cooling in the wheelspace cavity and root injection. Overall, it was found that even a small quantity (1 percent) of cooling air can have significant effects on the performance character and exit conditions of the high pressure stage. Parameters such as the total-to-total efficiency, total pressure loss coefficient, and three-dimensional velocity field show local changes in excess of 5, 2, and 15 percent, respectively. It is clear that the cooling air disturbs the inlet end-wall boundary layer to the rotor and modifies secondary flow development, thereby resulting in large changes in turbine exit conditions.

Original languageEnglish (US)
Pages (from-to)687-696
Number of pages10
JournalJournal of Turbomachinery
Volume123
Issue number4
DOIs
StatePublished - Oct 2001

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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