Abstract
In this study, the aim is to exhibit vortical behaviors of flow on double delta wings having 70° strake sweep angle and kink angles of 150°, 160° and 165° using dye visualization technique in a water channel. Experiments were performed at Reynolds numbers based on the chord length Re = 10,000 and 25,000 for angle of attack in the range 5° to 35°. The visualizations were performed for both end-view and cross-flow planes. The results revealed that the kink angle has a significant role on the interaction of vortices and the strake vortex breakdown locations. The interaction between the strake vortex and the wing vortex is dominant on the flow behaviors at α ≤ 10°. The flow behavior is affected by the kink angle. Two interaction mechanisms which are spiral and enveloping are observed. The spiral interaction alternates to enveloping interaction with increasing Reynolds number. Moreover, the trajectory of the strake vortex core moves outboard with increasing Reynolds number at α = 10°. For α ≥ 15°, Reynolds number is less effective on the strake vortex breakdown location and also the vortex breakdown locations move the apex gradually with increasing angle of attack. Wake-alike flow structure takes place after occurrence of the vortex breakdown since vortex core splits into disorganized small-scale vortices. On the other hand, development of the wing vortex is more complex than the strake vortex since it collapses near the vicinity of the junction.
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Abbreviations
- θ :
-
Kink angle
- Λs :
-
Strake sweep angle
- Λw :
-
Wing sweep angle
- α :
-
Angle of attack
- Re :
-
Reynolds number
- x :
-
Stream-wise direction
- c :
-
Chord length
- U :
-
Free stream velocity
- H w :
-
Height of the water
- VB:
-
Vortex breakdown
- L VB :
-
Dimensionless vortex breakdown location
- R :
-
Recirculation zone
References
Canpolat C, Yayla S, Sahin B, Akilli H (2009) Dye visualization of the flow structure over a yawed nonslender delta wing. J Aircr 46:1818–1822. https://doi.org/10.2514/1.45274
Ekaterinaris JA, Coutley RL, Schiff LB, Platzer MF (1995) Numerical investigation of high incidence flow over a double-delta wing. J Aircr 32:457–463. https://doi.org/10.2514/3.46742
Gai SL, Roberts M, Barker A et al (2004) Vortex interaction and breakdown over double-delta wings. Aeronaut J 108:27–34. https://doi.org/10.1017/s0001924000004966
Gursul I, Allan M, Badcock K (2005) Opportunities for the integrated use of measurements and computations for the understanding of delta wing aerodynamics. Aerosp Sci Technol 9:181–189. https://doi.org/10.1016/j.ast.2004.08.007
Hebbar SK, Platzer MF, Fritzelas AE (2000) Reynolds number effects on the vortical-flow structure generated by a double-delta wing. Exp Fluids 28:206–216. https://doi.org/10.1007/s003480050380
Kumar BA, Kumar P, Das S, Prasad J (2017) Effect of leading edge shapes on 81°/45° double-delta wing at low speeds. Proc Instit Mech Eng Part G J Aerosp Eng. https://doi.org/10.1177/0954410017724822
Lee KY, Sohn MH (2003) The vortical flow field of delta wing with leading edge extension. KSME Int J 17:914–924. https://doi.org/10.1007/bf02983406
Li Q, Sun D, Zhang H (2013) Detached-eddy simulations and analyses on new vortical flows over a 76/40° double delta wing. Sci China Phys Mech Astron 56:1062–1073. https://doi.org/10.1007/s11433-013-5105-6
Liu J, Sun H, Liu Z, Xiao Z (2014) Numerical investigation of unsteady vortex breakdown past 80°/65° double-delta wing. Chin J Aeronaut 27:521–530. https://doi.org/10.1016/j.cja.2014.04.018
Mitchell AM, Barberis D, Molton P et al (2000) Oscillation of vortex breakdown location and blowing control of time-averaged location. AIAA J 38:793–803. https://doi.org/10.2514/2.1059
Nelson RC, Pelletier A (2003) The unsteady aerodynamics of slender wings and aircraft undergoing large amplitude maneuvers. Prog Aerosp Sci 39:185–248. https://doi.org/10.1016/s0376-0421(02)00088-x
Sahin B, Akilli H, Lin J-C, Rockwell D (2001) Vortex breakdown-edge interaction: consequence of edge oscillations. AIAA J 39:865–876. https://doi.org/10.2514/2.1390
Sahin B, Yayla S, Canpolat C, Akilli H (2012) Flow structure over the yawed nonslender diamond wing. Aerosp Sci Technol 23:108–119. https://doi.org/10.1016/j.ast.2011.06.008
Sinha A, Suthar AK, Sahoo S, et al (2017) Effect of sweep angle on wing-strake vortex - Interaction and breakdown over double delta wings. In: 2017 First international conference on recent advances in aerospace engineering (ICRAAE). https://doi.org/10.1109/icraae.2017.8297212
Sohn MH, Chang JW (2010) Effect of a centerbody on the vortex flow of a double-delta wing with leading edge extension. Aerosp Sci Technol 14:11–18. https://doi.org/10.1016/j.ast.2009.11.004
Sohn MH, Lee KY, Chang JW (2008) Delta-wing vortex visualization using micro-sized water droplets generated by an ultrasonic humidifier. J Vis 11:337–346. https://doi.org/10.1007/bf03182202
Thu AM, Byun YH, Lee J-W (2012) Dye visualization of the vortical flow structure over a double-delta wing. J Aerosp Eng 25:541–546. https://doi.org/10.1061/(asce)as.1943-5525.0000195
Verhaagen NG (2002) Effects of reynolds number on flow over 76/40-degree double-delta wings. J Aircr 39:1045–1052. https://doi.org/10.2514/2.3033
Verhaagen N, Jenkins L, Kern S, Washburn A (1995) A study of the vortex flow over a 76/40-deg double-delta wing. In: 33rd Aerospace Sciences Meeting and Exhibit. https://doi.org/10.2514/6.1995-650
Wang JJ, Liu JY, Li QS (2003) The effects of apex flap on the leading-edge vortex breakdown of a cropped double delta wing. Aeronaut J 107(1078):739–742. https://doi.org/10.1017/S000192400001349X
Woodiga SA, Liu T (2009) Skin friction fields on delta wings. Exp Fluids 47:897–911. https://doi.org/10.1007/s00348-009-0686-6
Yaniktepe B, Rockwell D (2005) Flow structure on diamond and lambda planforms: trailing-edge region. AIAA J 43:1490–1500. https://doi.org/10.2514/1.7618
Zhang X, Wang Z, Gursul I (2016) Interaction of multiple vortices over a double delta wing. Aerosp Sci Technol 48:291–307. https://doi.org/10.1016/j.ast.2015.11.020
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Authors would like to thank Mechanical Engineering Department at Cukurova University for providing of Fluid Mechanics Laboratory.
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Durhasan, T., Karasu, İ. Dye visualization over double delta wing with various kink angles. J Vis 22, 669–681 (2019). https://doi.org/10.1007/s12650-019-00562-9
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DOI: https://doi.org/10.1007/s12650-019-00562-9