Abstract
Abstract The flow within the impeller and the vaneless diffuser of a centrifugal turbomachine model operating at the nominal point has been experimentally investigated. The radial and circumferential velocities and the associated turbulent fluctuations have been measured on seven cross-sectional circumferential surfaces, four within the impeller and three in the vaneless diffuser by means of a four-beam two-color fibre optic laser-Doppler velocimeter. To complete the flow investigation, LDV measurements have been performed on the blade-to-blade plane at mid-span. Data acquired have been processed by means of a phase locked ensemble-average technique in order to separate periodic from turbulent fluctuations. The results show the impeller flow structure, the development and decay of the blade and through-flow wakes and the main features of the diffusing flow. The present experimental work provides a well documented data base suitable for the assessment of turbomachinery flow prediction codes.
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