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Dependence of vortex breakdown on angular momentum parameter in draft tube flows

Sharma, CL and Soundranayagam, S and Somkrishan, * and Mukund, TS (1998) Dependence of vortex breakdown on angular momentum parameter in draft tube flows. In: Current Science, 75 (12). pp. 1355-1363.


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The present study has shown that a rotating runner is a powerful means of investigating draft tube flows because of the convenience in using the hot wire anemometry. A rotating runner acts as a powerful mixing device giving good pressure recovery even in the presence of considerable inlet swirl. Spectrum analysis of the hot wire signal reveals the phenomenon similar to vortex breakdown that introduces oscillations outside a narrow range of unit speed surrounding the design point. There is every indication that water turbine surge and the oscillations observed in the present experiments are one and the same. There is also some evidence that classical vortex break down may not be identical to what happens in the draft tube.

Item Type: Journal Article
Publication: Current Science
Publisher: Indian Academy of Sciences
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Vortex breakdown;Angular momentum parameter
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 10 Oct 2006
Last Modified: 19 Sep 2010 04:15
URI: http://eprints.iisc.ac.in/id/eprint/1638

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