Simulation of a Transonic Axial Flow Fan of a High Bypass Ratio Turbofan Engine During Flight Conditions

Hassan, Hamdy; Gobran, M. H.; El-Azim, A. Abd

doi:10.15866/irease.v7i1.1338

Cited by 4 publications

(7 citation statements)

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“…As such, Taylor instability is expected to characterize the flow. This is confirmed by PIV measurements and flow visualisation obtained at different inner cylinder angular velocities 1  . Fig.…”

Section: Iii1 Piv Flow Regime In the Testssupporting

confidence: 71%

“…where i R and o R are the radii of the inner and outer cylinder respectively, L is the length of the cylinders, 1  is the rotational speed of the inner cylinder, 2  is the rotational speed of the outer cylinder, d is the gap width, which is the distance between the outer diameter (OD) of the inner cylinder and the inner diameter (ID) of the outer cylinder, and  is the fluid kinematic viscosity.…”

Section: Nomenclaturementioning

confidence: 99%

“…1(b). Measurements are taken as the inner cylinder is rotated at the different angular speeds 1  listed in The start-up procedure for all the test cases in this work is a sudden start condition in which the target rotating speed of the inner cylinder is reached within one second. The average room temperature during the experiments was 22.5 ±0.5 o C. Since the temperature excursion during the experiments was ±0.5 o C, the results have not been corrected for thermal effects.…”

Section: Ii3 Experimental Proceduresmentioning

confidence: 99%

“…The Taylor number effect was further tested by halving the Taylor number from 2.36 × 10 6 to 1.18 × 10 6 and from 6.47 × 10 6 to 3.26 × 10 6 , for test case 2. Finally, test case 2 was run at the upper and lower 1  operational limits of the test rig.…”

Section: Ii3 Experimental Proceduresmentioning

confidence: 99%

“…By altering the rotational speed 1  , this experiment has enabled to observe the transition from Taylor vortex flow to Wavy Taylor vortex flow and, subsequently to Turbulent Taylor vortex flow. This has determined the approximate range of 1  for Wavy Taylor vortex flow. The remainder of this paper is concerned with examining closely the vortex flow structures for two different test cases  = 11.36,  = 0.53 and  = 7.81,  = 0.44 at 1  = 500 rpm, with specific attention to the fluid dynamics observable from PIV.…”

Section: Iii1 Piv Flow Regime In the Testsmentioning

confidence: 99%

See 4 more Smart Citations

The Persistence of Vortex Structures Between Rotating Cylinders in the 106 Taylor Number Range

Adebayo

Rona

2015

IREASE

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Section: Iii1 Piv Flow Regime In the Testssupporting

confidence: 71%

Section: Nomenclaturementioning

confidence: 99%

Section: Ii3 Experimental Proceduresmentioning

confidence: 99%

Section: Ii3 Experimental Proceduresmentioning

confidence: 99%

Section: Iii1 Piv Flow Regime In the Testsmentioning

confidence: 99%

See 3 more Smart Citations

The Persistence of Vortex Structures Between Rotating Cylinders in the 106 Taylor Number Range

Adebayo

Rona

2015

IREASE

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Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow

Altmeyer

2019

Sci Rep

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In this paper we investigate the effects of an externally imposed axial mass flux (axial pressure gradient, axial through flow) on ferrofluidic Taylor-Couette flow under the influence of either an axial or a transverse magnetic field. Without an imposed axial through flow, due to the symmetry-conserving axial field and the symmetry-breaking transverse field, it gives rise to various vortex flows in ferrofluidic Taylor-Couette flow such as wavy Taylor vortex flow (wTVF), wavy spiral vortex flow (wSPI) and wavy vortex flows ( and ), which are typically produced by a nonlinear interaction of rotational, shear and magnetic instabilities. In addition, when an axial through flow is imposed to a ferrofluidic Taylor-Couette flow in the presence of either an axial or a transverse magnetic field, previously unknown new helical vortex structures are observed. In particular, we uncover ‘modulated Mixed-Cross-Spirals’ with a combination of at least three different dominant azimuthal wavenumbers. Emergence of such new flow states indicates richer but potentially more controllable dynamics in ferrofluidic flows, i.e., an imposed axial through flow will be a new controllable factor/parameter in applications of a ferrofluidic and magnetic flows flow.

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The Three-Dimensional Velocity Distribution of Wide Gap Taylor-Couette Flow Modelled by CFD

Adebayo

Rona

2016

International Journal of Rotating Machinery

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A numerical investigation is conducted for the flow between two concentric cylinders with a wide gap, relevant to bearing chamber applications. This wide gap configuration has received comparatively less attention than narrow gap journal bearing type geometries. The flow in the gap between an inner rotating cylinder and an outer stationary cylinder has been modelled as an incompressible flow using an implicit finite volume RANS scheme with the realisablek-εmodel. The model flow is above the critical Taylor number at which axisymmetric counterrotating Taylor vortices are formed. The tangential velocity profiles at all axial locations are different from typical journal bearing applications, where the velocity profiles are quasilinear. The predicted results led to two significant findings of impact in rotating machinery operations. Firstly, the axial variation of the tangential velocity gradient induces an axially varying shear stress, resulting in local bands of enhanced work input to the working fluid. This is likely to cause unwanted heat transfer on the surface in high torque turbomachinery applications. Secondly, the radial inflow at the axial end-wall boundaries is likely to promote the transport of debris to the junction between the end-collar and the rotating cylinder, causing the build-up of fouling in the seal.

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Simulation of a Transonic Axial Flow Fan of a High Bypass Ratio Turbofan Engine During Flight Conditions

Cited by 4 publications

References 0 publications

The Persistence of Vortex Structures Between Rotating Cylinders in the 106 Taylor Number Range

The Persistence of Vortex Structures Between Rotating Cylinders in the 106 Taylor Number Range

Effects of an imposed axial flow on a Ferrofluidic Taylor-Couette flow

The Three-Dimensional Velocity Distribution of Wide Gap Taylor-Couette Flow Modelled by CFD

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