Effects of Reduced Frequency on the Behaviors of Burst Point Around a Pitching Double Delta Wing

2018 ◽  
pp. 57-62
Author(s):  
Jian Liu ◽  
Haisheng Sun ◽  
Zhitao Liu ◽  
Zhixiang Xiao
Keyword(s):  
Delta Wing ◽  
Reduced Frequency ◽  
Double Delta Wing

Investigation on lift characteristics of a double-delta wing pitching in various reduced frequencies

2021 ◽  
pp. 095441002199220
Author(s):  
Tianxiang Hu ◽  
Yue Zhao ◽  
Peiqing Liu ◽  
Qiulin Qu ◽  
Hao Guo ◽  
...  
Keyword(s):  
Delta Wing ◽  
Lower Surface ◽  
Sweep Angle ◽  
Delta Wings ◽  
Surface Pressure Distribution ◽  
Reduced Frequency ◽  
Wing Sweep ◽  
The Difference ◽  
The Impact ◽  
Double Delta Wing

The unsteady lift characteristics of a double-delta wing were studied using both experimental and numerical approaches, which were also compared with a single-delta wing with the same main wing sweep angle. It was found that by increasing the reduced frequency of pitching, the hysteresis effect of lift was magnified. Moreover, in the high reduced frequency case k = 0.48, the difference between the lift coefficients of single- and double-delta wings became rather subtle. The wing surface pressure distribution results indicated the flow phenomenon of dramatic lift losses was due to the effect of lower surface suction during the wing being pitched downstroke. It was observed that, as the reduced frequency became sufficiently high, the virtual camber effect induced by pitching could dominate the flow field, which would mitigate the impact of wing geometry on the lift characteristics.

Diamond, cropped, delta, and double-delta wing vortex breakdown during dynamic pitching

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

Effects of Various Shape Fillets on a 76/40 Double Delta Wing from Mach 0.18 to 0.7

1994 ◽  
Author(s):  
Hugo Gonzalez ◽  
Gary Erickson ◽  
Blair McLachlan ◽  
James Bell
Keyword(s):  
Delta Wing ◽  
Double Delta Wing

Effect of Nature-Inspired Needle-Shaped Vortex Generators on the Aerodynamic Features of a Double-Delta Wing

2021 ◽  
pp. 106502
Author(s):  
Hamed Khodabakhshian Naeini ◽  
Mahdi Nili-Ahmadabadi ◽  
Yoon Seong Park ◽  
Kyung Chun Kim
Keyword(s):  
Delta Wing ◽  
Vortex Generators ◽  
Double Delta Wing

scholarly journals Numerical investigation of unsteady vortex breakdown past 80°/65° double-delta wing

2014 ◽  
Vol 27 (3) ◽  
pp. 521-530 ◽  
Author(s):  
Jian Liu ◽  
Haisheng Sun ◽  
Zhitao Liu ◽  
Zhixiang Xiao
Keyword(s):  
Numerical Investigation ◽  
Vortex Breakdown ◽  
Delta Wing ◽  
Double Delta Wing

Numerical Investigations for the Effect of Slender Body on Dynamic Rolling Characteristics of a 80°/60° Double Delta Wing

2013 ◽  
Vol 444-445 ◽  
pp. 286-292
Author(s):  
Bing Han ◽  
Min Xu ◽  
Xi Pei ◽  
Xiao Min An
Keyword(s):  
Stokes Equations ◽  
Delta Wing ◽  
Time Lag ◽  
Slender Body ◽  
Vortical Flow ◽  
Navier Stokes ◽  
Rolling Motion ◽  
Navier Stokes Equations ◽  
Lag Effect ◽  
Double Delta Wing

The effect of slender body on the rolling characteristics of a double delta wing is found by comparing the numerical simulation results of the double delta wing and wing-body configuration. The coupled computation system solving the Navier-Stokes equations and the rolling motion equation alternatively to obtain the unsteady vortical flow around the two configurations while rolling. The results conclusively showed the upwash effect of the slender body enhanced the energy of strake vortex and merged vortex.The aerodynamic lag of double delta wing is weak, contrarily, the time lag effect of the wing-body configuration is significant. The asymmetry vortices structure nearby the trailing edge are believed to be the main reason for the unsteady time lag effect.

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