Investigation of Unsteady Characteristics of Vortex Breakdown

Author(s):  
Lan Chen ◽  
Jinjun Wang ◽  
Lihao Feng ◽  
Handong Hu
2011 ◽  
Vol 128-129 ◽  
pp. 350-353
Author(s):  
Ming Lu Zhang ◽  
Yi Ren Yang ◽  
Zhi Yong Lu

A study of flow and frequency characteristics of the leading-edge vortices over a delta wing undergoing pitching up-stop motions is presented. The experiments with the dynamic delta wings were conducted in a water channel and a wind tunnel respectively. Among them, the test of the flow visualization was completed in the water channel with the delta wing with pitching up-stop motions. The result shows that in the case of pitching up-stop movement the vortex breakdown position is dependent on the range of incidence at which the wing is subject to pitching up-stop and the reduced frequency k (k=c/2U∞). Analysis of the pressure signal measured in the wind tunnel shows when the delta wing is subject to pitching-up the nondimensional spiral wave frequency at nominal incidence in post-breakdown is higher than that at corresponding static state and the bigger the k is, the higher the nondimensional spiral wave frequency is. The same conclusion is fitted with different sweep delta wing.


2011 ◽  
Vol 66-68 ◽  
pp. 1874-1877 ◽  
Author(s):  
Ming Lu Zhang ◽  
Yi Ren Yang ◽  
Zhi Yong Lu ◽  
Li Lu

Experiment of unsteady pressure measurement on the surface of wing with 75° sweep delta wing has been carried out in a wind tunnel in order to investigate unsteady characteristics of breakdown vortices over delta wing after the leading edge vortices were breakdown. The result of experiment shows that alter of RMS pressure fluctuations and fluid state of leading edge vortices on the top surface of delta wing are correlative. At the angle region with vortex breakdown, RMS of pressure fluctuations are very huge, similarly buffeting strength of delta wing are large. With increasing angle of attack, alter of buffeting strength is in accordance with RMS pressure fluctuations. Analysis of the pressure signal shows the spiral wave of the breakdown vortex flow over the wing is the primary part of whole RMS pressure fluctuations. Delta wing produces buffeting because of the spiral wave.


AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 186-187
Author(s):  
S. Srigrarom ◽  
M. Kurosaka

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 571-574
Author(s):  
H. Yang ◽  
I. Gursul
Keyword(s):  

AIAA Journal ◽  
1997 ◽  
Vol 35 ◽  
pp. 567-569
Author(s):  
Roy Y. Myose ◽  
Boon-Kiat Lee ◽  
Shigeo Hayashibara ◽  
L. S. Miller

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 825-834
Author(s):  
F. Novak ◽  
T. Sarpkaya

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