Vortex Flow Dilemmas & Control on Wing Planforms for High Speeds

نویسندگان

  • R. K. Nangia
  • A. S. Miller
چکیده

Aircraft for sustained supersonic flight usually feature low aspect ratio wings with varying (reducing) leading edge sweep over the outer portion to achieve an 'adequate' low-speed performance. A high-speed "cruise" wing then becomes subject to mixed flows at low-speeds, including strong Vortical flows. Dilemmas then arise whether to exploit the vortical flows or to control / suppress them (actively or passively) with LE and TE devices. On one hand vortical flows lead to higher lift at the expense of higher drag and possible flow breakdown over the outer wing. On the other hand, controlling them implies reduced lift but higher L/D. The dilemmas are more intense if the configuration is "attitude-limited" (floor angle, tail strike). All this leads to the need for improving the understanding of vortical flows on a given configuration. This paper focusses on vortex control with different types of LE and TE devices. Several examples are given. The techniques developed can be adapted to more complex configurations including canards, nacelles, etc.

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تاریخ انتشار 2001