To control the flow separation and effectively reduce outlet total pressure distortion of a S-shaped duct Bump inlet

vortex generators (VGs) were designed and installed at the entry of the S duct.The commercial CFD software was used to simulate the internal and external flow fields at the design point (Ma=2.0) and off design points (Ma=1.8

0.8)

and predict the effectiveness of VGs with different parameters.The simulation results indicate that

VGs installation can suppress flow separation and remarkably reduce the total pressure distortion at exit of Bump inlet at design point.At some off design points

it can increase the total pressure distortion at exit of Bump inlet.It can slightly increase the total pressure loss.And VGs with different vane distance make a similar influence on the total pressure loss.