A physical model of asymmetric vortices flow structure in regular state over slender body at high angle of attack

Xueying, Deng

doi:10.1360/02ye0164

Cited by 40 publications

(23 citation statements)

References 19 publications

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“…The rolling moment on the wing, which drives the free-to-roll motion, should be mainly dependent on both the strength of forebody asymmetric vortices and their specific positions in this vortices flow field. It is well known that the asymmetric vortices system over a slender body is a multi-vortices structure with vortices shedding alternately [7]. And the distribution of sectional side forces on a body could be denoted as the distribution of strength of forebody asymmetric vortices.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…It has been known that the forebody vortices will become asymmetric over a slender body at high angles of attack [6][7][8]. The asymmetric vortices are extremely sensitive to tip perturbations, and even the natural tip perturbation arising from machining tolerance could dramatically change the forebody vortex orientation, which is an inherent and unique feature of the forebody asymmetric vortices.…”

Section: Introductionmentioning

confidence: 99%

“…And there is non-determinacy in the asymmetric vortices flow induced from the natural tip perturbation. If an artificial perturbation is added on the nose tip, the asymmetric vortices flow would become deterministic and its orientation would regularly change in two cycles with varied perturbation circumferential location around the tip [7,8]. To our knowledge, however, the previous studies of this kind of wing rock have not dealt with tip perturbations imposed on the forebody nose.…”

Section: Introductionmentioning

confidence: 99%

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Effects of tip perturbation and wing locations on rolling oscillation induced by forebody vortices

Wang

Xueying

et al. 2010

Acta Mech Sin

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The wing rock motion is frequently suffered by a wing-body configuration with low swept wing at high angle of attack. It is found from our experimental study that the tip perturbation and wing longitudinal locations affect significantly the wing rock motion of a wing-body. The natural tip perturbation would make the wing rock motion of a nondeterministic nature and an artificial mini-tip perturbation would make the wing rock motion deterministic. The artificial tip perturbation would, as its circumferential location is varied, generate three different types of motion patterns:(1) limit cycle oscillation, (2) irregular oscillation, (3) equilibrium state with tiny oscillation. The amplitude of rolling oscillation corresponding to the limit cycle oscillatory motion pattern is decreased with the wing location shifting downstream along the body axis.

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Section: Experiments and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of tip perturbation and wing locations on rolling oscillation induced by forebody vortices

Wang

Xueying

et al. 2010

Acta Mech Sin

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“…Therefore the results on the asymmetric vortex flow and side forces become repeatable with the addition of an artificial perturbation on the model tip. By this artificial grit perturbation on two slender models with the same contour the reproducible test results [26,45] could be obtained even in the two different wind tunnels, if the circumferential positions of the artificial perturbation were the same on both models, as shown in Fig. 4.…”

Section: Determinacy Of Asymmetric Vortex Flow and Repeatability Withmentioning

confidence: 90%

“…In order to obtain a repeatable and reproducible test results of an asymmetric vortex flow over a slender model and corresponding side force from tests in wind tunnels. Chen et al [42], Deng et al [43], Chen [44], Deng et al [45][46][47] have completed a series of studies. They used a simple micro-grit as an artificial perturbation to attach on the model tip.…”

Section: Determinacy Of Asymmetric Vortex Flow and Repeatability Withmentioning

confidence: 99%

Recent progress on the study of asymmetric vortex flow over slender bodies

Xueying

Tian

et al. 2008

Acta Mech Sin

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The investigations of forebody vortex flow and its flow control have great importance in both academic field and engineering application areas. A large number of papers and many review papers have been published. However in this research field of forebody asymmetric vortices, three problems such as tip perturbation effect, Reynolds number effect and flow instability are less studied and thus not understood completely. So many researches are still working on the issues in recent years. The present paper attempts to provide a review of recent research progress on first two problems. The first problem is mainly concerned with how the vortex flow evolves after tip perturbation; how to solve the problem of repeatability and reproducibility of wind tunnel testing data; how to develop a conception of active flow control technique with tip perturbation based on the study of vortex flow response to tip perturbation. For the second problem one is mainly concerned that how the asymmetric vortices are developed with the increase of Reynolds number; how to classify the vortex flow patterns in different Reynolds number regimes; how to develop an appropriate boundary layer transition technique to simulate flows at high Reynolds number in the convention wind tunnels. Finally, some important questions that deserve answers are proposed in the concluding remarks.

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The Study of Reynolds Number Effect on the Behaviors of Asymmetric Vortices Flow

Xueying

Ning

Chen

et al. 2007

New Trends in Fluid Mechanics Research

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A physical model of asymmetric vortices flow structure in regular state over slender body at high angle of attack

Cited by 40 publications

References 19 publications

Effects of tip perturbation and wing locations on rolling oscillation induced by forebody vortices

Effects of tip perturbation and wing locations on rolling oscillation induced by forebody vortices

Recent progress on the study of asymmetric vortex flow over slender bodies

The Study of Reynolds Number Effect on the Behaviors of Asymmetric Vortices Flow

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