The inherent risk of flow separation limits the extent of diffusion that can be achieved in a single stage axial compressor. Tandem blading is a promising concept that has drawn the attention of designers and researchers. Tandem blading permits higher blade turning and hence higher diffusion factor and blade loading with lower risk of flow separation. The present study explores the feasibility of using a tandem rotor in a low speed compressor stage. Computational analysis of the performance and flow behavior of the stage is presented at design and off-design conditions. The results are initially validated with experimental test data. A higher percentage pitch of 85% and lower axial overlap of 5% is selected for the tandem rotor. Results of the tandem rotor stage is compared with a baseline stage comprising a single bladed rotor. The results indicate tandem blading offers better diffusion characteristics than the single rotor. Some interesting observations pertaining to the interaction between the gap-nozzle flow and the 3D flow features are also discussed.

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