FLOW CHARACTERISTICS IN BOUNDARY-LAYER BLEED SLOTS WITH PLENUM

Numerical simulations were conducted to investigate the performance ch aracteristics of bleed through a normal slot and its effect on the tur bulent boundary-layer development under zero and strong adverse pressu re gradient caused by an Incident oblique shock, The solution to the c ompressible Navier-Stokes and k-epsilon equations was obtained in a do main that includes the regions inside the bleed slot and plenum in add ition to the external flow. The computational results demonstrate the interactions between the plenum, and bleed how and the effect of incid ent shock on the boundary-layer development downstream. The computed r esults are compared with the experimentally measured bleed mass flow a nd the pitot and static pressure distribution inside the slot, The com putations predicted the measured increase in bleed mass flow with inci dent shock, and agreed with the measured bleed slot pressure fields, e xcept in the regions of experimental uncertainties due to how curvatur e and bleed shock, Without incident shock the bleed mass flow was unde rpredicted by the computations over the range of plenum pressures.