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around ct = 30 deg. The wing rock for this configuration was primarily caused by
the powerful forebody vortices that interacted in a complex manner with the wing
vortices as described.40
    To suppress the wing rock, a tangential, aftjet blowing was done from the slots
located on the leeward side near the forebody tip.*o It was interesting to note that
steady, symmetric blowing on both sides to force a symmetric disposition of the
 forebody vortices did not suppress the wing rock. This observation is similar to that
described earlier39 for the 60-deg delta wing model with a conical nose. Instead,
a steady one-sided blowing suppressed the wing rock, but the model assumed a
nonzero equilibrium roll angle. As said earlier, the asymmetric blowing was ac-
companie'c7 by undesirable side force and yawing moments. However, the pulsed
 blowing from left and right slots at a high frequency could suppress the wing rock
 as shown in Fig. 8.58. In this way, the time-averaged values of the side force and
 yawing moments could be kept down to a minimum for this configuration.
8.J1.2  Active Controlof Wing Rock
      Because the loss of roll damping at high alpha is the primary cause ofinstability
in roll and the development of wing rock, it is natural to think of a stability
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728           PERFORMANCE, STABILITY, DYNAMICS, AND CONTROL
   30
   20
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  -20
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  -40
30
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t, ,
o   1   2   '   4   s   s   7   .   9   .0
                        t, ,
~g. 8.57    Wing rock suppression with one-sided forebody blowing.39
STABILITY AND CONTROL PROBLEMS AT HIGH ANGLES OF ATTACK   729
Breaklik           Siaion B         Sf}.ior.C
                                                                                                                                                                                       
                                                                                                                                                                                       
　
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