Influence of Nose Perturbation on Behaviors of Asymmetric Vortices over Slender Body

Xueying, Deng; Chen, Xuerui; Wang, Yankui; Liu, Peiqing

doi:10.2514/6.2002-4710

Cited by 8 publications

(9 citation statements)

References 12 publications

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“…Because various types of perturbations do not change their influence on behaviors of the vortical flow [15] , the conclusions drawn from the bump perturbation are universal in a sense and can be extended to some other types of perturbations.…”

Section: Computational Results and Discussionmentioning

confidence: 91%

“…Experimental results from Deng et al [15] suggested that the influence of nose perturbations on the vortical flow was repeatable and there were four sensitive circumferential locations existing, around which nose perturbations traversing circumferentially the vortical flow switched between two regular states. Both numerical and experimental results from Degani [10,11] and Deng et al [15] showed that the sensitivity of the vortical flow to nose perturbations increased with nose perturbations shifting closer to nose apex. Numerical results form Levy et al [16] suggested that the asymmetry degree of the vortical flow was a function of perturbation size.…”

Section: Introductionmentioning

confidence: 96%

“…By this time, lots of interrelated work [7,11,14,15] has been conducted, where additional certain artificial perturbations were employed and considered as the total perturbation because the influence of other uncertain perturbations can be ignored. Experimental results from Deng et al [15] suggested that the influence of nose perturbations on the vortical flow was repeatable and there were four sensitive circumferential locations existing, around which nose perturbations traversing circumferentially the vortical flow switched between two regular states. Both numerical and experimental results from Degani [10,11] and Deng et al [15] showed that the sensitivity of the vortical flow to nose perturbations increased with nose perturbations shifting closer to nose apex.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of nose-perturbation location on behavior of vortical flow around slender body at high incidence

Guan

Wang

et al. 2009

Sci. China Ser. E-Technol. Sci.

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Response of the vortical flow around a slender body of revolution at high incidence to the shift of a single nose perturbation was investigated systematically using numerical methods. A minute geometric bump was employed to act as the nose perturbation, and all computations were performed for subsonic flows at incidence of 50°. The computational results show that the vortical flow is more sensitive to the perturbation located axially closer to the nose apex of a slender body. With perturbation shifting axially downstream away from nose apex, there is a critical axial location appearing. The vortical flow is less sensitive to the perturbation located axially closer to the critical axial location; when perturbation traverses axially around the critical axial location, the vortical flow switches between opposite asymmetric patterns. The eventual influence of perturbation axial location on the vortical flow lies on both its relative locations to nose apex and the critical axial location. The vortical flow is more sensitive to the perturbation located circumferentially farther away from the fore-and-aft symmetric plane of a slender body, and just the asymmetrically-located perturbation can provoke the vortical flow to asymmetry. With perturbation shifting circumferentially in sequence, the vortical flow varies by degrees in manner of a single periodicity. A convective-type of instability existing in the flow field is responsible for the influence of nose perturbation on the vortical flow.slender body of revolution, high-incidence aerodynamics, asymmetric vortical flow, nose perturbation, critical location

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Section: Computational Results and Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of nose-perturbation location on behavior of vortical flow around slender body at high incidence

Guan

Wang

et al. 2009

Sci. China Ser. E-Technol. Sci.

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“…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%

“…In order to improve this forebody vortex active control characteristics at high angles of attack with bistable state behavior, Deng et al [43,[45][46][47]53,55] have studied and explored systematically the behaviors of forebody asymmetric vortices with artificial perturbation and then developed a new active control technique in which a micro-bleed with single small hole of diameter 0.5 mm at model nose was used as artificial variable strength micro-perturbation. Their results from that control technique showed that when the artificial micro-perturbation with bleed momentum C µ = 0 (in this case just small hole plays an artificial perturbation) on the model nose tip is rotated in one cycle, the asymmetric vortices flow pattern in bistable state will switch over in two cycles.…”

Section: Active Control Of Asymmetric Vortex Flow With Nose Perturbationmentioning

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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