Experimental investigation of enclosed rotor-stator disk flows

Cheah, S. C.; Iacovides, Hector; Jackson, Daniel M.; Ji, Ho Seong; Launder, B. E.

doi:10.1016/0894-1777(94)90022-1

Cited by 47 publications

(40 citation statements)

References 7 publications

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“…× 10 3 , while along the rotor side, turbu-lent flow develops later for 3.6 × 10 5 < Re r < 6.4 × 10 5 for G = 12.5. This is in agreement with the experiment of Cheah et al [4] performed for rotational Reynolds numbers ranging 3 × 10 5 < Re r < 1.6 × 10 6 inside a rotor-stator system of aspect ratio G = 7.87. The rotor side becomes turbulent for Re r = 4.…”

Section: Introductionsupporting

confidence: 81%

“…× 10 5 while the stator is shown to be turbulent at all Reynolds numbers considered. Cheah et al [4] found differences in turbulence characteristics between the rotor and the stator and that the turbulent flow field is also affected by the radial location. These authors concluded to an influence of the radial convective transport of turbulence on the flow field.…”

Section: Introductionmentioning

confidence: 99%

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Large eddy simulation and measurements of turbulent enclosed rotor-stator flows

et al. 2007

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Turbulent flows are studied in an actual enclosed rotor-stator configuration with a rotating hub and a stationary shroud. Besides its fundamental importance -the disk boundary layer is one of the simplest platforms for investigating the underlying structure of three-dimensional boundary layers -this cavity models more complex configurations relevant to rotating machinery. Large Eddy Simulation (LES) is performed using a Spectral Vanishing Viscosity (SVV) technique which is shown leading to stable discretizations without sacrificing the formal accuracy of the spectral approximation. Numerical results and velocity measurements have been favorably compared for a large range of rotational Reynolds numbers 10 5 ≤ Re = Ωb 2 /ν ≤ 10 6 in an annular cavity of curvature parameter R m = (b + a)/(b − a) = 1.8 and of aspect ratio G = (b − a)/h = 5, where a and b are respectively the inner and outer radii of the rotating disk and h is the interdisk spacing.In the detailed picture of the flow structure that emerges, the turbulence is mainly confined in the boundary layers including in the Stewartson layer along the external cylinder. For Reynolds numbers Re ≥ 10 5 , the stator boundary layer is turbulent over most of the cavity. On the other hand, the rotor layer becomes progres-2 sively turbulent from the outer radial locations although the rotating hub is shown to destabilize the inner part of the boundary layers. The isosurface maps of the Q-criterion reveal that the three-dimensional spiral arms observed in the unstable laminar regime evolve to more axisymmetric structures when turbulence occurs. At Re = 10 6 , the flow is fully turbulent and the anisotropy invariant map highlights turbulence structuring, which can be either a "cigar-shaped" structuring aligned on the tangential direction or a "pancake-shaped" structuring depending on the axial location. The reduction of the structural parameter a 1 (the ratio of the magnitude of the shear stress vector to twice the turbulence kinetic energy) under the typical limit 0.15, as well as the misalignment between the shear stress vector and the mean velocity gradient vector, highlight the three-dimensional nature of both rotor and stator boundary layers with a degree of three-dimensionality much higher than in the idealized system studied by Lygren and Andersson [1,21,22].

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Section: Introductionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Large eddy simulation and measurements of turbulent enclosed rotor-stator flows

et al. 2007

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“…40 Owen and Rogers report that with radial centripetal or centrifugal through flow, near the axis boundary layers break down, and that a through flow governing flow profile remains. 41 This is consistent with the experimental findings of Haddadi and Poncet.…”

Section: Transition Of Plug Flow To Mixed Volumementioning

confidence: 96%

Residence time distribution in a single‐phase rotor–stator spinning disk reactor

et al. 2013

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A reactor model for the single-phase rotor-stator spinning disc reactor based on residence time distribution measurements is described. For the experimental validation of the model, the axial clearance between the rotor and both stators is varied from 1.0 3 10 23 to 3.0 3 10 23 m, the rotational disc speed is varied from 50 to 2000 RPM, and the volumetric flow rate is varied from 7.5 3 10 26 to 22.5 3 10 26 m 3 s 21 . Tracer injection experiments show that the residence time distribution can be described by a plug flow model in combination with 2-3 ideally stirred tanks-in-series. The resulting reactor model is explained with the effect of turbulence, the formation of Von K arm an and B€ odewadt boundary layers, and the effect of the volumetric flow rate.

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“…Firouzian et al 14 performed velocity and pressure measurements for a wide range of flow rates and rotational speeds. Cheah et al 16 performed detailed measurements of the mean velocity and the turbulent flow field inside a rotor-stator system. Owen entrainment coefficient K of the fluid ͑K is the ratio between the mean tangential velocity in the central rotating core and that of the disk at the same radius͒.…”

Section: Introductionmentioning

confidence: 99%

Batchelor versus Stewartson flow structures in a rotor-stator cavity with throughflow

2005

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The present work considers the turbulent flow inside a high-speed rotor-stator cavity with or without superimposed throughflow. New extensive measurements made at IRPHE by a two-component laser Doppler anemometer technique and by pressure transducers are compared to numerical predictions based on one-point statistical modeling using a low-Reynolds-number second-order full stress transport closure (Reynolds stress model). The advanced second-order model provides good predictions for the mean flow as well as for the turbulent field and so is the adequate level of closure to describe such complex flows. A better insight into the dynamics of such flows is also gained from this study. Indeed the transition between a Batchelor type of flow with two boundary layers separated by a central rotating core and a Stewartson type of flow with only one boundary layer on the rotating disk is characterized in the (r*,Ro) plane, where r* is the dimensionless radial location and Ro a modified Rossby number. The 5∕7 power-law of Poncet et al. [“Turbulent rotating disk with inward throughflow,” J. Fluid Mech. 522, 253 (2005)] describing the mean centripetal flow in a rotor-stator system is extended to different aspect ratios and to the case of centrifugal Batchelor type of flows.

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Experimental investigation of enclosed rotor-stator disk flows

Cited by 47 publications

References 7 publications

Large eddy simulation and measurements of turbulent enclosed rotor-stator flows

Large eddy simulation and measurements of turbulent enclosed rotor-stator flows

Residence time distribution in a single‐phase rotor–stator spinning disk reactor

Batchelor versus Stewartson flow structures in a rotor-stator cavity with throughflow

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