Spectral Fluctuations in Centrifugal Impeller Outlet Flows

Murugesan, K and Ramamurthy, S (1994) Spectral Fluctuations in Centrifugal Impeller Outlet Flows. In: 2nd National Conference on Air Breathing Engines and Aerospace Propulsion, December 1994, Trivandrum. (Submitted)

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Detailed measurements at outlet of a centrifugal impeller were carried out using hot wire anemometry. It was found that the flow is non-uniform across the blade pitch and showing a spectral unsteadiness with reference to time at the mean width of hub to shroud passage, Through an appropriate methodology of evaluation including Fourier Transformation (FFT) analysis, the flow properties were characterized for the spacial and unsteady variations. Predominance of a frequency peak at three times the speed of revolution indicates the periodic formation and cross channel sweep of vortices within the impeller blade channel. This phenomenon would explain the deviations of real flow measurements from that obtained by assessing a uniform relative eddy or a jet-wake in the propeller channel

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: Fourier Transformation, spectral unsteadiness, jet-wake, propeller channel
Subjects: AERONAUTICS > Aeronautics (General)
AERONAUTICS > Aircraft Propulsion and Power
Depositing User: Dr S Ramamurthy
Date Deposited: 10 Aug 2010 04:43
Last Modified: 10 Aug 2010 04:43
URI: http://nal-ir.nal.res.in/id/eprint/8922

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