Centrifugal compressor tip clearance and impeller flow

Abstract

Compressors consume a considerable portion of the electricity used in the industrial sector. Hence, improvements in compressor efficiencylead to energy savings and reduce environmental impacts. The efficiency of an unshrouded centrifugal compressor suffers fromleakage flow over the blade tips. The effect of tip leakage flow on the passage flow differs between the full and splitter blade passages. Inthis study, the differences in the flow fields between the full and splitter blade passages were studied numerically in detail. An industrialhigh-speed compressor with a design pressure ratio of 1.78 was modelled. Numerical studies were conducted with six different tip clearancesand three different diffuser widths. The results show that increasing tip clearance considerably increases the reversed flow into theimpeller with an unpinched diffuser. The reversed flow then partly mixes into the flow in the same blade passage it entered the impellerand the rest migrates over the blade, mixing with the tip clearance flow. Furthermore, as the reversed and clearance flow mix into thewake, the wake is weakened. As pinch reduces both the reversed flow and clearance flow, the passage wakes are stronger with pinches.However, the pinch is beneficial as the losses at the impeller outlet decrease.