Quarter annulus simulations of blade row interaction at several gaps and discussion of flow physics.

摘要

In order to accurately model the physics associated with losses in a transonic compressor, a time-accurate simulation of a transonic compressor rig was developed. Parameters for grid resolution and time-stepping found in previous phase-lag analyses were used to develop quarter annulus simulations to investigate the physics involved in the rotor bow shock interaction with a highly loaded upstream blade row and its effect on the compressor. Three different axial spacings between the rotor and the upstream blade row have been simulated corresponding to the experimental rig. Details of the unsteady and time-averaged flow field are presented and described. The numerical simulations indicate the same trends as the experiment for efficiency at various spacings. The interaction mechanisms which govern entropy generation and losses are explored. These include wake-shock, wake-boundary layer, and shock-boundary layer interactions.