From a design point of view, advances in the rotor dynamic analysis,bearing design and control systems should allow smaller tip clearance to be implemented.
In addition, the volute has an effect on the compressor stage performance , and with different volute designs it is possible to achieve higher efficiency over wider operating range . Some
volute design options may also offer savings in component size and delivery time without sacrificing the compressor efficiency. Besides tip clearance and volute design, minor efficiency
improvements in centrifugal compressors can be expected with careful aerodynamic design of the inlet piping, especially with the unconventional inlets, and by focusing on the leakage flow
through the labyrinth seals on the backside of the impeller