Experimental investigation of propeller induced ground vortex under headwind condition

Yang, Yannian; Sciacchitano, Andrea; Veldhuis, L.L.M.; Eitelberg, G.

doi:10.2514/6.2014-2308

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…For a propeller with an axisymmetric inflow, the axial component of the time-averaged velocity in the propeller inflow can be predicted by the actuator disk model (Yang et al 2012 ), which is shown as below where was defined Eq. ( 1 ) already.…”

Section: Definitionsmentioning

confidence: 99%

Analysis of propeller-induced ground vortices by particle image velocimetry

Yang

Sciacchitano

Veldhuis

et al. 2017

J Vis

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The interaction between a propeller and its self-induced vortices originating on the ground is investigated in a scaled experiment. The velocity distribution in the flow field in two different planes containing the self-induced vortices is measured by particle image velocimetry (PIV). These planes are a wall–parallel plane in close proximity to the ground and a wall–normal plane just upstream of the propeller. Based on the visualization of the flow field in these two planes, the occurrence of ground vortices and its domain boundary are analysed. The elevation of the propeller from the ground and the thrust of the propeller are two parameters that determine the occurrence of ground vortices. The main features of the propeller inflow in the presence of the ground vortices are highlighted. Moreover, the analysis of the non-uniform inflow in the azimuthal direction shows that with increasing the propeller thrust coefficient and decreasing the elevation of the propeller above the ground, the variation of the inflow angle of the blade increases.Graphical Abstract

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Section: Definitionsmentioning

confidence: 99%

Analysis of propeller-induced ground vortices by particle image velocimetry

Yang

Sciacchitano

Veldhuis

et al. 2017

J Vis

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“…The dimension of the domain is: in the X direction, and in the Y direction on the ground plane, where R is the radius of the propeller. The diameter, D , and the distance of the actuator disk model above the ground, h , are according to the experimental test conducted on a propeller model (Yang et al 2014 ). A brief description of the experimental setup is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…To help understand the setup of the numerical simulations, which is intended to be the same as the experiment (Yang et al 2014 ), the arrangements of the experiment are shown in Fig. 4 .…”

Section: Methodsmentioning

confidence: 99%

Numerical analysis of propeller induced ground vortices by actuator disk model

Yang

Veldhuis

Eitelberg

2017

J Vis

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During the ground operation of aircraft, the interaction between the propulsor-induced flow field and the ground may lead to the generation of ground vortices. Utilizing numerical approaches, the source of vorticity entering ground vortices is investigated. The results show that the production of wall-parallel components of vorticity has a strong contribution from the wall-parallel components of the pressure gradient on the wall, which is generated by the action of the propulsor. This mechanism is a supplementation for the vorticity transported from the far-field boundary layer, which has been assumed the main vorticity source in a number of previous publications. Furthermore, the quantitative prediction of the occurrence of ground vortices is performed from the numerical results. As the distance of the propeller form the ground decreases, and as the thrust of the propeller increases, ground vortices are generated from the ground and enter the propeller. In addition, the vortices which exist near the ground but does not enter the propeller plane are observed and visualized by three-dimensional data.Graphical abstract

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“…For a propeller with axisymmetric inflow, the time-averaged inflow velocity in axial direction can be predicted by a modified actuator disk model [18], which assumes that the pressure jump across the disk is generated by the upstream suction of the propeller; the slipstream is immediately expanded to the free stream pressure. The equivalent inflow velocity in the propeller plane is assumed uniform both in the azimuthal and radial directions,…”

Section: Definitions and Parametersmentioning

confidence: 99%

“…The blade vortex interaction (BVI) phenomenon is well known in the community of turbomachinery and rotorcraft aerodynamics. For an aircraft propeller, one or more vortices can arise from a ground plane and impinge on the blades during ground operation [1], as shown on the lefthand side of Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Propeller and inflow vortex interaction: vortex response and impact on the propeller performance

et al. 2016

Self Cite

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The aerodynamic operating conditions of a propeller can include complex situations where vorticity from sources upstream can enter the propeller plane. In general, when the vorticity enters in a concentrated form of a vortex, the interaction between the vortex and blade is referred to as blade-vortex interaction or BVI. The interaction may affect the propeller performance as well as its noise production. In the present paper, investigations of the interaction of a wing tip vortex generated by a lifting surface upstream of the rotor plane and an eight-bladed propeller are reported. Utilizing two ends of an upstream wing with non-symmetrical airfoil, the rotation of the incoming vortex could be made to co-rotate or to contra-rotate with the propeller. The ensuing velocity fields were quantified with the help of particle image velocimetry (PIV), and the propeller performance was evaluated with the help of a rotating shaft balance (RSB) mounted on the propeller shaft. The results describe the displacement of the vortex core, as it moves through the rotor plane as well as the positive effect on the thrust and torque of the contra-rotating vortex and the opposite of it in the case of the co-rotating vortex. The current research could be applied to analyse the influence of the incoming vortex on the propeller, e.g., ground vortex, tip vortex shed from a control surface, etc. Keywords Vortex flow Á Blade vortex interaction List of symbols D Diameter of propeller, m J Advance ratio of propeller Q Torque of propeller, Nm Q C Torque coefficient R Radius of propeller, m T Thrust of propeller, N T C Thrust coefficient U eq Equilibrium inflow velocity of propeller, m/s U rad Radial velocity, m/s U tan Tangential velocity, m/s U ? Free stream velocity, m/s n Propeller rotating speed, round/s r À Vortex radius in front of the propeller disk, normalized by propeller radius r þ Vortex radius behind the propeller disk, normalized by propeller radius C imp,cor Circulation in the core of the wing tip vortex, normalized by U eq* D x Vorticity, rad/s

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Experimental investigation of propeller induced ground vortex under headwind condition

Cited by 5 publications

References 15 publications

Analysis of propeller-induced ground vortices by particle image velocimetry

Analysis of propeller-induced ground vortices by particle image velocimetry

Numerical analysis of propeller induced ground vortices by actuator disk model

Propeller and inflow vortex interaction: vortex response and impact on the propeller performance

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