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학술대회자료
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2002년 춘계학술대회논문집
발행연도
2002.5
수록면
1,486 - 1,493 (8page)

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This paper is focused on stall inception at vaneless diffuser of a centrifugal compressor. Eight fast-response pressure transducers are equally spaced around the circumference at the inlet and exit of a vane less diffuser. Experiments are done from 20000rpm to 60000rpm for the diffuser stall. Two-cell structure which rotates at 6~10% of impeller speed is fully developed at 20000~ 40000rpm, and three-cell structure which rotates at 7~9% of impeller speed is fully developed at 50000~60000rpm. It is found that two-cell and three-cell structures of small amplitude wave grow and decay repeatedly before they fully develops to rotating stall, which is named as "pre-cell". When it appears, then the phase of spatial Fourier coefficient increases linearly and the traveling wave energy increases. The pre-cell travels at or slightly lower than the speed of fully developed rotating stall, and its growing-decaying life time is about several decade of impeller revolutions. Pre-cells of two-cell and three-cell structures are found to interact in their growing and decaying mechanism through transferring energy from one structure to the other. These phenomena that pre-cells grow and decay repeatedly and finally lead to fully developed rotating stall are different stall inception pattern with mode and spike which are well known stall inception pattern in axial compressors. So it is named as "pre-cell stall inception". This is thought to be characteristic stall inception pattern in vaneless diffuser of centrifugal compressor.

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UCI(KEPA) : I410-ECN-0101-2009-550-014200988