Velocity field measurements in the wake of a propeller model

Mukund, R; Kumar, Anand

doi:10.1007/s00348-016-2237-2

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…This loading is periodic at the blade-passage frequency and its harmonics, as shown by the experimental studies by Ljunggren et al [15] and Johnston and Sullivan [16]. The locally increased turbulence levels in the slipstream [18] will also lead to periodic laminar-to-turbulent transition on the downstream element [19,20], introducing additional load fluctuations. This secondary phenomenon is not considered in the current paper.…”

Section: Introductionmentioning

confidence: 91%

Unsteady Pylon Loading Caused by Propeller-Slipstream Impingement for Tip-Mounted Propellers

Sinnige¹,

Vries²,

Corte

et al. 2018

Journal of Aircraft

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An experimental analysis was performed of the unsteady aerodynamic loading caused by the impingement of a propeller slipstream on a downstream lifting surface. When installed on an aircraft, this unsteady loading results in vibrations that are transmitted to the fuselage and are perceived inside the cabin as structure-borne noise. A pylonmounted tractor-propeller configuration was installed in a low-speed wind tunnel at Delft University of Technology. Surface-microphone and particle-image-velocimetry measurements were taken to quantify the pressure fluctuations on the pylon and visualize the impingement phenomena. It was confirmed that the propeller tip vortex is the dominant source of pressure fluctuations on the pylon. Along the path of the tip vortex on the pylon, a periodic pressure response occurs with strong harmonics. The amplitude of the pressure fluctuations increases with increasing thrust setting, whereas the unsteady lift coefficient displays a nonmonotonic dependency on the propeller thrust. The lowest integral unsteady loads were obtained for cases with approximately integer ratios between the pylon chord and the wavelength of the perturbation associated with the propeller tip vortices. This implies that structure-borne-noise reductions might be obtained by matching the pylon chord with an integer multiple of the axial separation between the propeller tip vortices.

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Section: Introductionmentioning

confidence: 91%

Unsteady Pylon Loading Caused by Propeller-Slipstream Impingement for Tip-Mounted Propellers

Sinnige¹,

Vries²,

Corte

et al. 2018

Journal of Aircraft

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show abstract

“…The physics of tip vortex cavitation, TVC, involves simultaneous presence of small flow structures and phase change. Since controlling TVC is vital for low-noise propellers [1,2,3], intensive efforts have been conducted both experimentally and numerically to understand the physics of this flow. The marine industry generally seeks only to increase the tip vortex core pressure to alleviate cavitation, and to do so, a few approaches are proposed and tested.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Tip Vortex Cavitation Mitigation By Controlled Surface Roughness

Svennberg¹,

Asnaghi²,

Gustafsson³

et al. 2020

Preprint

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This study presents results of experiments where roughness applications are evaluated in delaying the tip vortex cavitation inception of an elliptical foil. High-speed video recordings and Laser Doppler Velocimetry (LDV) measurements are employed to provide further details on the cavitation behaviour and tip vortex flow properties in different roughness pattern configurations. The angular momentum measurements of the vortex core region at one chord length downstream of the tip indicate that roughness leads to a lower angular momentum compared to the smooth foil condition while the vortex core radius remains similar in the smooth and roughened conditions.The observations show that the cavitation number for tip vortex cavitation inception is reduced by 33 % in the optimized roughness pattern compared to the smooth foil condition where the drag force increase is observed to be around 2 %. During the tests, no obvious differences in the cavitation inception properties of uniform and non-uniform roughness distributions are observed. However, the drag force is found to be higher with a non-uniform roughness distribution.

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Experimental analysis of tip vortex cavitation mitigation by controlled surface roughness

et al. 2020

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Velocity field measurements in the wake of a propeller model

Cited by 7 publications

References 18 publications

Unsteady Pylon Loading Caused by Propeller-Slipstream Impingement for Tip-Mounted Propellers

Unsteady Pylon Loading Caused by Propeller-Slipstream Impingement for Tip-Mounted Propellers

Experimental Analysis of Tip Vortex Cavitation Mitigation By Controlled Surface Roughness

Experimental analysis of tip vortex cavitation mitigation by controlled surface roughness

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