DNS of turbulent flows inside a simplified stage of high- pressure compressor

Abstract eng:
The present work reports high-order direct numerical simulations (DNS) of the turbulent flow inside a simplified stage of highpressure compressor. The geometry corresponds to the experimental set-up of Owen and Pincombe [4] and Farthing et al. [1]. The axial Reynolds number is fixed to Re = 5300, while five values of the Rossby number are considered: Ro = 1, 2, 4, 40 and +∞. For Ro = +∞, the main flow along the axis is similar to a round jet with packets of helicoidal turbulent structures. A vortex stretching mechanism generates elongated structures in the axial direction. A secondary flow is produced inside the cavity with a main recirculation. For Ro = 2 and 1, modes 1b and 2b are obtained respectively, coexisting with type 1 and type 2 instabilities developed along the disks.

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