The rise in temperature and pressure ratios for both turbine and compressor intrinsically require an increased secondary air system performance. The more demanding operating environment of the components to be cooled and the quest for improved efficiency, command a particular attention to the losses faced along the secondary flow path. One of the major pressure drop is experienced with the radial inflow in a rotating cavity, becoming a potential high gain branch of the system. The use of vortex reducers has shown a considerable improvement in performance and this paper presents the work done to minimize the pressure losses for an industrial gas turbine application using various vortex reducers. The numerical results and the set-up of a one-dimensional network model and Computational Fluid Dynamics (CFD) model for various configurations are discussed in detail showing an improved system performance with the proposed vortex reducer configuration.

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