Cloos, Ferdinand-J. ; Zimmermann, Anna-L. ; Pelz, Peter F. (2022)
A Second Turbulent Regime When a Fully Developed Axial Turbulent Flow Enters a Rotating Pipe.
ASME Turbo Expo 2016 - Turbomachinery Technical Conference and Exposition GT2016. Seoul, South Korea (13.-17.06.2016)
doi: 10.26083/tuprints-00021469
Konferenzveröffentlichung, Zweitveröffentlichung, Postprint

Kurzbeschreibung (Abstract)

When a fluid enters a rotating circular pipe a swirl boundary layer with thickness of δ̃s appears at the wall and interacts with the axial momentum boundary layer with thickness of δ̃. We investigate a turbulent flow applying Laser-Doppler-Anemometry to measure the circumferential velocity profile at the inlet of the rotating pipe. The measured swirl boundary layer thickness follows a power law taking Reynolds number and flow number into account. A combination of high Reynolds number, high flow number and axial position causes a transition of the swirl boundary layer development in the turbulent regime. At this combination, the swirl boundary layer thickness as well as the turbulence intensity increase and the latter yields a self-similarity. The circumferential velocity profile changes to a new presented self-similarity as well. We define the transition inlet length, where the transition appears and a stability map for the two regimes is given for the case of a fully developed axial turbulent flow enters the rotating pipe.

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