Design and experiment of high pressure-ratio free-vortex aerodynamic window

Design ideas of supersonic transverse free-vortex aerodynamic window(ADW) were discussed, and the reason of a single-stage ADW not easily reaching high sealing pressure ratio was analyzed. Based on the pneumatic parameter distribution at the ADW diffuser inlet, an active diffuser with wall boost was designed and validated by tests, whose sealing pressure ratio reached 85 in the test.The results show that the air blowing in diffuser inlet is an efficient method for improving sealing pressure ratio; the blowing in the diffuser’s inner wall has more impact on sealing pressure ratio than that in the outer wall.