Theoretical and Applied Mechanics Letters (Sep 2016)

Side force control on slender body by self-excited oscillation flag

  • Jian Zhai,
  • Weiwei Zhang,
  • Chuanqiang Gao,
  • Yanhua Zhang,
  • Zhengyin Ye,
  • Huanling Wang

DOI
https://doi.org/10.1016/j.taml.2016.08.004
Journal volume & issue
Vol. 6, no. 5
pp. 230 – 232

Abstract

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Strong asymmetrical vortices appear on the leeward of slender body at high angles of attack, which has very unfavorable effect on the stability and control of the aircraft. A method is developed to control the side force of slender body at high angles of attack, and is verified in wind tunnel. A thin-film triangular self-excited oscillation flag is fixed at the tip of the slender body model whose semi-apex angle is 10°. Side force is approximately linearly proportional to roll-setting angle of self-excited oscillation flag at high angles of attack, and the slop of fitting straight line obtained by the least square method is −0.158. The linear relationship between side force and roll-setting angle provides convenience for developing side force control law of slender body at high angles of attack. Experimental data shows that the side force coefficients vary linearly with roll-setting angles when a specific plastic self-excited oscillation flag is used as the control flag. The range of side force coefficient and roll-setting angle are, respectively, −3.2 to 3.0 and −20° to 20°. The device is simple, effective, and is of great potential in engineering application.

Keywords