Surface Pressure Measurements of the Orthogonal Vortex Interaction

Doolan, Con J.; Coton, F. N.; Galbraith, R.A.McD.

doi:10.2514/2.1274

Cited by 19 publications

(9 citation statements)

References 14 publications

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“…13a as thin dashed arcs. If we limit the observation to the interaction radius arc during the passing of the vortex, we observe the same behavior as described by Doolan et al [24]: a local suction on the blade, which follows the vortex and is of high amplitude on the blade leading edge. Figure 14 represents the pressure coefficient along with the streamlines on the blade leading edge, when the blade is at azimuth 360 deg.…”

Section: A Interaction With a Batchelor Vortexsupporting

confidence: 82%

“…The compressibility effects were limited to the compression side for subcritical vortices and produced a damped wave effect on the vortex core radius. Doolan et al [23][24][25], stating that the early studies of Schlinker and Amiet [1], Ahmadi [2], and Cary [3] were not representative of a realistic helicopter situation, investigated the interaction from a different point of view. They developed an experimental apparatus for a horizontal wind tunnel where a single blade rotated around a vertical axis and generated a vortex with a cycloid shape.…”

mentioning

confidence: 99%

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Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

2018

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Section: A Interaction With a Batchelor Vortexsupporting

confidence: 82%

mentioning

confidence: 99%

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

2018

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“…These radii have been added in Figure 13(a) as thin dashed arcs. If we limit the observation to the interaction radius arc during the passing of the vortex, we observe the same behavior as described by Doolan et al [24]: a local suction on the blade, which follows the vortex and is of high amplitude on the blade leading edge. Figure 14 represents the pressure coefficient along with the streamlines on the blade leading edge, when the blade is at azimuth 360…”

Section: The Variation Of This Nondimensional Velocity Is Plotted Inmentioning

confidence: 52%

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Zehner¹,

Falissard²,

Gloerfelt

2016

22nd AIAA/CEAS Aeroacoustics Conference

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The aeroacoustic response of the orthogonal interaction of a rotating blade with an isolated Batchelor vortex is studied by means of numerical simulation. The relative influence of the vortex tangential and axial velocity on the blade aerodynamics and on the acoustics radiated in the far-field is analyzed by comparing the interaction with a Batchelor vortex to the interactions considering the vortex tangential or axial velocity components. Analyses show that the vortex tangential velocity contributes mostly to the noise level at low frequencies, whereas the vortex axial velocity is responsible for the contribution at high frequencies. For the range of frequencies in between, the interaction noise results from constructive interferences of the noise radiated separately by each velocity component of the vortex.

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“…More recently, a series of experimental investigations of orthogonal BVI were conducted at the Glasgow University 1⋅15m × 0⋅85m low speed wind-tunnel (14)(15)(16)(17)(18)(19) . A novel vortex generator was used, which consisted of a one-bladed rotor rig, with the rotational axis located in the tunnel's contraction.…”

Section: Introductionmentioning

confidence: 99%

A wind-tunnel based study of helicopter tail rotor blade vortex interaction

et al. 2004

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The interaction of a helicopter tail rotor blade with the tip vortex system from the main rotor is a significant source of noise and, in some flight states, can produce marked reductions in control effectiveness. This paper describes a series of wind-tunnel tests to simulate tail rotor blade vortex interaction with a view to providing data for the development and validation of numerical simulations of the phenomenon. In the experiments, which were carried out in the Argyll wind-tunnel of Glasgow University, a single-bladed rotor located in the tunnel’s contraction was used to generate the tip vortex which travelled downstream into the working section where it interacted with a model tail rotor. The tail rotor was instrumented with miniature pressure transducers that measured the aerodynamic response during the interaction. The results suggest that the rotor blade vortex interaction is similar in form to that measured at much higher spatial resolution on a fixed, non-rotating blade. The combination of the two datasets, therefore, provides a valuable resource for the development and validation of predictive schemes.

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Surface Pressure Measurements of the Orthogonal Vortex Interaction

Cited by 19 publications

References 14 publications

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

Aeroacoustic Study of the Interaction of a Rotating Blade with a Batchelor Vortex

A wind-tunnel based study of helicopter tail rotor blade vortex interaction

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