An aerodynamic investigation of a centrifugal compressor for HCFC123

A centrifugal compressor was investigated experimentally to improve HCFC123 compression performance. A CFC11 compressor working with HCFC123 shows lower adiabatic head rise, efficiency and volume flow. Another CFC11 compressor working with HCFC123 and a modified impeller shows a result comparable to that when CFC11 is compressed. A tandem impeller is designed to compensate for the volume flow increase for HCFC123. This impeller sufficiently absorbs the volume flow increase and also improves efficiency.