二段軸流圧縮機に生じるサージ・旋回失速共存系の過渡特性

抄録

Interaction between surge and rotating stall in an axial flow compressor was investigated from the viewpoint of an unsteady inner flow structure. The aim of this study was to unravel the mechanism of the interaction between the surge and rotating stall, and unsteady behavior under the coexisting phenomena. The main feature of the tested compressor is a shock tube connected in series to the compressor outlet through a diaphragm, slits, and a concentric duplex pipe. The unsteady characteristics and the internal flow velocity fluctuations were measured in detail. The result suggests that the key factor that determines the unsteady behavior of surge is the transformation of the internal flow structure, particularly between the stall cell and the entire circumferential stall.