An axisymmetric bend duct was investigated numerically and experimentally to obtain the flow field characteristics in its internal passage with/without struts. The wake characteristics and influences of exit Mach numbers were also analyzed in detail. Results indicate that experiments agree well with simulations. The airflow accelerated at first and then decelerated in the bend duct. And two local low-pressure areas were generated respectively at both leeward sides of the two bends. Moreover

struts had a great effect on the flow structure in the bend duct

inducing wake and vortexes. At different radial positions near the wake

the total pressure distributions were quite different. In addition

with the increase of exit Mach number

the static pressure on the wall surface and the total pressure recovery of the outlet cross section decreased

but the adverse pressure gradients near the two bends increased. So this indicates a greater risk of boundary layer separation.