Flow in a "cover-plate" preswirl rotor-stator system


Karabay H. , Chen J., Pilbrow R., Wilson M., Owen J.

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, cilt.121, ss.160-166, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 121 Konu: 1
  • Basım Tarihi: 1999
  • Doi Numarası: 10.1115/1.2841225
  • Dergi Adı: JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
  • Sayfa Sayısı: ss.160-166

Özet

This paper describes a combined theoretical, computational, and experimental study of the flow in an adiabatic preswirl rotor-stator system. Preswirl cooling air, supplied through nozzles in the stator, flows radially outward, in the rotating cavity between the rotating disk and a cover-plate attached to it, leaving the system through blade-cooling holes in the disk. An axisymmetric elliptic solver, incorporating the Launder-Sharma low-Reynolds-number k - epsilon turbulence model, is used to compute the flow. An LDA system is used to measure the tangential component of velocity, V-phi, in the rotating cavity of a purpose-built rotating-disc rig. For rotational Reynolds numbers up to 1.2 x 10(6) and preswirl ratios up to 2.5, agreement between the computed and measured values of V-phi is mainly very good, and the results confirm that free-vortex flow occurs in most of the rotating cavity. Computed values of the preswirl effectiveness (or the nondimensional temperature difference between the preswirl and blade-cooling air) agree closely with theoretical values obtained from a thermodynamic analysis of an adiabatic system.