Study was carried out for a slender body with rudders

with free stream Mach number of 2.0

attack angle of 0

10

20 degrees respectively

and the jet spout located between the×-shape rudders. First of all

numerical simulation and wind tunnel tests were carried out

and consistent radial pressure distribution near jet spout was obtained

verifying the feasibility of numerical simulation method. And then

the characteristics of change with attack angle of the interaction flow field were analyzed on the basis of flow field structure and flow parameters distribution obtained from numerical simulation. At last

influence of jet interaction on amplification factors was examined according to surface pressure distribution of slender body and rudders near jet spout. Results showed that

with increasing angle of attack

shock before jet moved towards jet spout with reduction of separation region

and pressure ratio increased with augmentation of penetration height. Amplification factors were larger than 1.0 and decreased with increasing angle of attack. When jet spout was located between×-shape rudders

jet interaction was beneficial to the enhancement of jet force. Existence of×-shape rudders eased the wraparound effect of jet

leading to favorable interference to the flow field.