Competing instabilities of rotating boundary-layer flows in an axial free-stream - 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery Access content directly
Conference Papers Year : 2016

Competing instabilities of rotating boundary-layer flows in an axial free-stream

Zahir Hussain
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Abstract

In this study, a new centrifugal instability mode, which dominates within the boundary-layer flow over a slender rotating cone, defined by half-angle ψ < 40°, is used for the first time to model the problem when an enforced oncoming axial flow is introduced. The resulting similarity solution represents the basic flow more accurately than previous studies in the literature. This mean flow field is subsequently perturbed leading to disturbance equations that are solved via numerical and analytical approaches, importantly yielding favourable comparison with existing experiments. Meanwhile, a formulation consistent with the classic rotating-disk problem has been successful in predicting the stability characteristics of broad rotating cones, defined by half-angle ψ > 40°, in axial flow.
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Dates and versions

hal-01879368 , version 1 (23-09-2018)

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  • HAL Id : hal-01879368 , version 1

Cite

Zahir Hussain. Competing instabilities of rotating boundary-layer flows in an axial free-stream. 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Apr 2016, Honolulu, United States. ⟨hal-01879368⟩

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