Blowing control in S-shaped inlet with significant boundary layer ingestion

Numerical simulation of blowing active flow control on a half flush-mounted S-shaped inlet was performed for improving its aerodynamic performance. The blowing control mechanism and influence of parameters (i.e. blowing location, blowing mass flow, blowing angle) variation on effect of blowing flow control were analyzed in detail. Results show that location selected for blowing has significant influence on effect of blowing, the 1st bend just before the separation point is the best blowing location. The total pressure recovery coefficient has a little rise about 0.56% and circumferential total pressure distortion coefficient and swirl distortion coefficient at exit reduce about 43.14% and 83.60% respectively in comparison with the prototype when blowing at 1st bend with blowing angle of 20° and ratio of blowing mass flow to air intake design mass flow about 1.75%. In addition, bigger angle doesn't mean better, on the contrary, little blowing angle should be selected for avoiding the high-energy air from pipes mixing with mainstream in the air intake. Moreover, blowing mass flow rise has different effects on total pressure recovery, circumferential total pressure distortion and swirl distortion. The improvement of first two becomes more obvious with the increase of blowing mass flow, while the third declines rapidly firstly, then falls slowly and even presents an increasing trend at last.