Square-Wave Circumferential Pressure Distortion Effects in Compressors.

摘要

A lightly loaded single stage compressor, in whose intake was set a series of distortion screens, was used in an experimental program to determine the effect of square-wave distortions on overall performance and detailed internal aerodynamics. It was found that a cross-coupling effect existed between the rotor and screen and under certain operating conditions this produced an asymmetry in the generated distortion. On rotor measurements recording the unsteady response of the rotor row to the distortion it was found that, for the operating point investigated, the rotor did not go into a previously observed dynamic stall. As a consequence it was possible to relate the stall behaviour of the rotor to the observed cross-coupling. Two sets of rotor blades were used and it was found that with a low aspect ratio, away from the design incidence the pressure distributions were disturbed by what are concluded tentatively to be three-dimensional effects. (Author)