Numerical investigation on thrust reverse flow field of podded engines on blended wing body

Reverse thrust is an efficient deceleration braking method to shorten the taxiing distance.Based on RANS （Reynolds averaged Navier-Stokes） method，SST （shear stress transport） turbulence model and inlet/exhaust boundary conditions were used to simulate the flow field around the thrust reverser.The variation law of aerodynamic load under the influence of the thrust reverser was explored，the drag increasing effect of the thrust reverser under different engine power was evaluated，and the distortion characteristics of the inlet flow field were preliminarily analyzed.The results showed that the thrust reverser flow can significantly affect the distribution of aerodynamic load，and the surface pressure in front of the engine increased gradually.Behind the thrust reverser flow belt，the surface pressure decreased sharply，and the influence weakened along spanwise direction.In a certain range，the larger axial deflection angle of the thrust reverser flow indicated the stronger influence of thrust reverser flow on the distribution of aerodynamic load，and the better drag increasing effect.The distortion characteristics of the inlet flow field would be affected by the changes of the axial deflection angle of reverse flow and the Mach number of freestream.