Three-dimensional measurements of vortex breakdown

Calderon, Dario; Wang, Zhijin; Gursul, Ismet

doi:10.1007/s00348-012-1317-1

Cited by 14 publications

(10 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The trailing edge location was tracked and subsequently verified to be within 1.25% of the peak to peak amplitude of the sine curve. 12 The angle of attack is fixed throughout the cycle. The frequency is managed by an IMO Jaguar Controller and the amplitude is set by fixing the link bar at various distances from the centre of rotation.…”

Section: A Experimental Setupmentioning

confidence: 99%

Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings

et al. 2013

Self Cite

View full text Add to dashboard Cite

Volumetric three-component velocimetry measurements have been performed on low aspect ratio wings undergoing a small amplitude pure plunging motion. This study focuses on the vortex flows generated by rectangular and elliptical wings set to a fixed geometric angle of attack of α = 20°. An investigation into the effect of Strouhal number illustrates the highly three-dimensional nature of the leading edge vortex as well as its inherent ability to improve lift performance. Computational simulations show good agreement with experimental results, both demonstrating the complex interaction between leading, trailing, and tip vortices generated in each cycle. The leading edge vortex, in particular, may deform significantly throughout the cycle, in some cases developing strong spanwise undulations. These are at least both Strouhal number and planform dependent. One or two arch-type vortical structures may develop, depending on the aspect ratio and Strouhal number. At sufficiently high Strouhal numbers, a tip vortex ring may also develop, propelling itself away from the wing in the spanwise direction due to self-induced velocity.

show abstract

Section: A Experimental Setupmentioning

confidence: 99%

Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings

et al. 2013

Self Cite

View full text Add to dashboard Cite

show abstract

“…An experimental investigation has found the flow mechanisms responsible for the aircraft loss of static directional stability (Jing et al 2016). The method of three-dimensional measurements of vortex breakdown has focused more on vortex dynamics mechanism (Calderon et al 2012). Medford (2012) has investigated the aerodynamics of a maneuvering unmanned aircraft vehicle (UAV) model and its control through leading-edge curvature change.…”

Section: Introductionmentioning

confidence: 99%

Vortex Dynamics Analysis of Straight-Body-Type-Fuselage Fighter Using CFD Simulation

Sutrisno

Deendarlianto

Rohmat

et al. 2020

J.Aerosp. Technol. Manag.

View full text Add to dashboard Cite

The choice for using a fighter fuselage in a fighter jet design affects a vortex generation advantageous in maneuverability. To study the effect of straight-body-type-fuselage (SBTF) on the vortex dynamic, a computational fluid dynamics (CFD) method is used, in order to simulate a model of SBTF fighter. The simulation uses Q-criterion to probe vortices, and a logarithmic grid to emphasize the micro-gridding effect of the turbulent boundary layer. The results show detailed quantitative velocity, pressure, trajectory of the vortex core, and wing negative surface pressure distribution (SPD), providing clear pictures of opportunity for performance improvement, better lift, agility, and maneuverability of a fighter if a model requires a new design.

show abstract

“…An experimental investigation has found the flow mechanisms responsible for the aircraft loss of static directional stability [22]. The method of three-dimensional measurements of vortex breakdown has gained more focus on vortex dynamics mechanism [23]. Nevertheless, the algorithm application of the Q-criterion algorithm so far has not been mixed with the track of the flowline for the vortex growth, to examine the vortex dynamics of the comprehensive picture.…”

Section: Introductionmentioning

confidence: 99%

Vortex Dynamics Study of the Canard Deflection Angles’ Influence on the Sukhoi Su-30-Like Model to Improve Stall Delays at High AoA

et al. 2019

View full text Add to dashboard Cite

The maneuverability of the Sukhoi Su-30 at very high angles of attack (AoA) was remarkably appealing. Canard angle, in cooperation with aircraft wing, created a flow pattern whereby, in that position, the fighter still had as much lifting force as possible in order not to stall. The behavior of changing canard angle configuration played an essential role in creating the strong vortex core so that it could delay the stall. The study of vortex dynamics at canard deflection angle gave an essential function in revealing the stall delay phenomenon. In this study, one could analyze the flow patterns and vortex dynamics ability of the Sukhoi Su-30-like model to delay stall due to the influence of canard deflection. The used of water tunnel facilities and computational fluid dynamics (CFD) based on Q-criterion has obtained clear and detailed visualization and aerodynamics data in revealing the phenomenon of vortex dynamics. It was found that between 30° and 40° canard deflection configurations, Sukhoi Su-30-like was able to produce the most robust flow interaction from the canard to the main wing. It was clearly seen that the vortex merging formation above the fighter heads was clearly visible capable of delaying stall until AoA 80°.

show abstract

Three-dimensional measurements of vortex breakdown

Cited by 14 publications

References 16 publications

Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings

Volumetric measurements and simulations of the vortex structures generated by low aspect ratio plunging wings

Vortex Dynamics Analysis of Straight-Body-Type-Fuselage Fighter Using CFD Simulation

Vortex Dynamics Study of the Canard Deflection Angles’ Influence on the Sukhoi Su-30-Like Model to Improve Stall Delays at High AoA

Contact Info

Product

Resources

About