超小型遠心圧縮機の研究開発(マイクロエネルギー変換,<特集>第13回動力・エネルギー技術シンポジウム)

概要

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The loss generation factor of two-dimensional centrifugal compressors is investigated by CFD analysis. The main loss factor is the separated flow and main flow interaction, and wall friction in the impeller. According to these results, we modified the impeller blade design by changing the blade inlet and outlet angles. We also investigated the tip clearance effects by CFD analysis. It showed that the leakage flow and main flow interaction is one of the main loss factors. When the tip clearance is 7% of the blade height, the maximum adiabatic efficiency and pressure ratio deteriorated by about 10% and 0.12 points respectively in comparison to the no tip clearance. As a result, the maximum adiabatic efficiency of 64.7% was achieved.
2009-03-25