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배명형(M. H. Bae),신유환(Y. H. Shin),김광호(K. H. Kim),김진형(J. H. Kim) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
A centrifugal compressor was tested with three different diffusers with plate vanes. The vane inlet angle was varied from 15 to 30 deg. The higher static pressure rises are obtained with lower vane stagger angle. In the stable region the static pressure field in vaneless space is very sensitive to flow rate. The impeller has a stabilizing effect over the whole stable operating range. The diffuser has a stabilizing effect at high flow rate but is destabilizing at low flow rate.
신유환,김광호,배명형,김진형,Shin, Y. H.,Kim, K. H.,Bae, M. H,,Kim, J. H. 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.2
This study presents the centrifugal compressor performance for three different vane stagger angles and wall pressure distribution within vaned diffuser channels, and is also discussed about the stability with respect to the compressor components. As the vane stagger angle decreases, the flow rate for the stall onset decreases, and higher pressure can be obtained at the low flow rate region, however, the effective operation range of the compressor decreases because of the blockage effect of the diffuser vane. Low pressure pocket within the vaned diffuser channel moves from the pressure side of leading edge to the suction side as the flow rate decreases. The compressor system stability mainly depends on that of the diffuser.