Vane Clocking Effects on Stall Margin in a Multistage Compressor

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Vane Clocking Effects on Stall Margin in a Multistage Compressor

Smith, Natalie R. / Key, Nicole L.

Vane clocking is the circumferential indexing of adjacent vane rows with similar vane counts. There are no reports in the open literature regarding clocking effects on stall margin. Recent vane clocking investigations showed a measurable impact on embedded stage efficiency in a three-stage axial compressor research facility. The current work aims to determine the change in stall margin with vane clocking in this multistage compressor facility. Six clocking configurations were investigated, and the onset of stall was measured using unsteady pressure transducers flush-mounted in the casing at the leading edge of each rotor row. Data were acquired while clocking the embedded stage, the stage with measurable efficiency changes associated with vane clocking. Data were also acquired while clocking the first stage, the stalling stage. The changes in stall margin for different clocking configurations for this compressor were small and within the measurement uncertainty, although a weak sinusoidal trend was present. Thus, it is possible to change the stage efficiency using vane clocking without impacting stall margin. Total pressure profiles suggest that clocking effects are limited to a particular range of operation, and as the compressor reaches very high loading conditions, the differences in wake profiles associated with vane clocking diminish.