A experiment model of S shaped 2D nozzle was designed based on axisymmetric exhaust system and studied on the infrared characteristic experiment rig. Flow parameters and the far field infrared radiation characteristics of the experiment model were measured under experimental conditions

and compared with the baseline axisymmetric nozzle experiment data. Results showed that

infrared radiation power of S shaped 2D nozzle was mainly in the upper detection plane

and the maximum radiation was in 15 degrees

due to the largest radiation contribution of solid walls in this direction angle. Infrared radiation power in lower and side detection plane was much less than that in upper detection plane because of the shielding effect of S shaped 2D nozzle. Compared with the axisymmetric nozzle

S shaped 2D nozzle had significant effect of infrared suppression

the infrared signature of the S shaped 2D nozzle reduced by 81% in the rear direction

and the maximum radiation intensity reduced by 47%

while the gas radiation reduced by 50%.