Experimental investigation of the swirl development at the inlet of a coaxial rotating diffuser or nozzle

[+] Author and Article Information
Ferdinand-J. Cloos

Graduate Research Assistant, Chair of Fluid Systems, Department of Mechanical Engineering, Technische Universität Darmstadt, Darmstadt, Hesse, Germany 64287

Peter F. Pelz

Professor and Head of Chair

1Corresponding author.

ASME doi:10.1115/1.4042095 History: Received February 06, 2018; Revised November 12, 2018


When a fluid enters a rotating pipe, a swirl boundary layer with thickness of $\tilde{\delta}_\mathrm{S}$ appears at the wall and interacts with the axial momentum boundary layer with thickness of $\tilde{\delta}$. The swirl is produced by the wall shear stress and \hlN{is not due to kinematic affects}. In the center of the pipe, the fluid is swirl-free and is accelerated due to axial boundary layer growth. Below a critical flow number $\varphi<\varphi_\mathrm{c}$, there is flow separation, known in the turbomachinery context as part load recirculation.

Previous work analyses the flow at the inlet of a coaxial rotating circular pipe ($\tilde{R}=\tilde{R}_0$). For a systematic approach to a turbomachine, the influence of the turbine's and pump's function on the evolution of the swirl and flow separation is to analyse. \hlN{The turbine's or pump's is schematically fulfilled by a diffuser or a nozzle, respectively.} The radius of the rotating pipe depends linearly on the axial coordinate, yielding a rotating circular diffuser or nozzle. The swirl evolution depends on the Reynolds number, flow number, axial coordinate and apex angle. The influence of the \hlN{apex angle is the main task by this investigation}. The circumferential velocity component is measured \hlN{via} 1D Laser Doppler Anemometry to investigate the swirl evolution.

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