Research Papers: Flows in Complex Systems

Wingtip Vortex Control Via Tip-Mounted Half-Delta Wings of Different Geometric Configurations

[+] Author and Article Information
T. Lee, S. Choi

Department of Mechanical Engineering,
McGill University,
Montreal, QC H3A 0G4, Canada

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received November 15, 2014; final manuscript received June 5, 2015; published online August 4, 2015. Assoc. Editor: Sharath S. Girimaji.

J. Fluids Eng 137(12), 121105 (Aug 04, 2015) Paper No: FE-14-1665; doi: 10.1115/1.4030852 History: Received November 15, 2014

The control of the tip vortex, generated by a rectangular NACA 0012 wing, via tip-mounted half-delta wings (HDWs), of different slendernesses Λ, root chords cr, and deflections δ, was investigated experimentally at Re = 2.45 × 105. The results show that regardless of Λ, cr, and δ, the addition of HDWs consistently led to a diffused tip vortex. The degree of diffusion was, however, found to increase with decreasing Λ and cr. HDWs with cr ≤ 50% of the baseline-wing chord c caused a rapid diffusion of vorticity and rendered a weak circulation flowlike tip vortex, suggesting an enhanced wake-vortex decay and alleviation. The cr = 0.5c HDW also produced an improved lift-to-drag ratio. A unique double-vortex pattern also exhibited downstream of the cr ≤ 50%c HDW wings. The interaction and merging of the double vortex were expedited by upward HDW deflection.

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Fig. 1

Schematics of the experimental setup

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Fig. 2

Impact of Λ, cr, and δ of the HDW on the normalized isovorticity contours of the tip vortex at x/c = 2.8 for α = 6 deg, 8 deg, and 10 deg. (a1)–(a3): BW; (b1)–(b3): 1c65HDW; (c1)–(c3): 1c50HDW; (d1)–(d3): 0.5c65HDW; (e1)–(e3): 0.5c50HDW; (f1)–(f3): 0.5c50HDW(+5); (g1)–(g3): 0.5c50HDW(−5); and (h1)–(h3): 0.3c50HDW. ζp denotes ζpeakc/u.

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Fig. 3

Growth and development of HDW vortex and BW vortex on HDW configuration and LEV on full delta wing. (a) BW at α = 10 deg, (b) 1c65HDW wing at α = 10 deg, (c) 65 deg-sweep full delta wing at α = 12 deg, (d) 50 deg-sweep full delta wing at α = 10 deg, (e) 0.5c50HDW at α = 10 deg, and (f) 0.3c50HDW at α = 10 deg.

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Fig. 4

Variation of normalized (a) vertical position and (b) peak vorticity of LEV with x/c on 65 deg-sweep full delta wing at α = 12 deg and 50 deg-sweep full delta wing at α = 10 deg

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Fig. 5

Effect of slenderness, root chord, and deflection of HDW on aerodynamic characteristics

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Fig. 6

Impact of Λ, cr, and δ of HDW on the trajectory and total circulation of the tip vortex at x/c = 2.8. Open and solid symbols denote BW vortex and HDW vortex, respectively.




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