Effects of Reduced Frequency on the Behaviors of Burst Point Around a Pitching Double Delta Wing

The dynamic behavior of burst point (BP) around delta wing (DW) during oscillation has been a hot topic for its close relationship with the stability and control of an aircraft. Delayed detached eddy simulation (DDES) combined with rigid moving mesh techniques was implemented to investigate the dynamic response of the BP around an 80°/65° double delta wing (DDW) during sinusoidal pitching motion at critical angle of attack (AOA). The effects of reduced frequency (RF) on the performance of BP were discussed in detail. The movement of BP is locked in the frequency of pitching motion with a large phase lag. The time-averaged location, oscillation amplitude and phase lag are significantly determined by RF. The time-averaged location reaches its most downstream at RF of 0.2. When the RF is near 0.2, the Root-mean-Square (rms) of displacement of BP is much larger. The phase lag increases linearly with the growth of RF.