The influence of blade profile shape of inlet guide vane on performance map of centrifugal compressor stage

Abstract

The object of the study is a centrifugal compressor stage with an inlet guide vane. The performance map of the stage
are investigated in the modes of combined regulation by changing the rotor speed and changing the swirl of the flow
in front of the impeller by turning the blades of the inlet guide vane. Two variants of the design of the profile of the blades
of the inlet guide vane are considered and the method of turning the blades by performance map. As a result of the study,
it is found that a profile with a fixed inlet part at large swept angles has a lower loss coefficient, which contributes to an
increase in the efficiency of the stage. The effect of regulation to achieve the set point in terms of pressure and flow
for the re-profile stage is achieved at lower speeds.