Experiment was conducted to study the distribution of wall temperature and infrared radiation characteristics on twodimensional convergentdivergent (2DCD) vectoring nozzle exhaust system with cone film cooling and nozzle impingementfilm cooling

in three geometric deflection states

namely deflection of 0°

10°

20°

and the results were compared with nocooling state. The experimental results showed that film holes with pre dense and after thinning arrangement form can effectively reduce the hot side temperature region size. For cone cooling state，under the conditions of density flow ratio of 08

cooling efficiency reached 45%-63%

the infrared radiation intensity of exhaust system decreased by 20%

in the tail direction ±10°，but due to the cooling air flow injection

the temperature of heat shield wall and nozzle wall increased

and infrared radiation intensity increased by 15%

in 30° detection direction. In nozzle cooling state

convergent section (density flow ratio of 0.25) cooling efficiency reached 19%-33%

the expansion section (density flow ratio of 065) cooling efficiency reached 755%-835%

the side wall sections (density flow ratio of 065) cooling efficiency reached 78%-90%

infrared radiation intensity decreased by more than 30%

in the tail direction 15°-75°

the maximum decrease reached 80% (geometric deflection angle of 20°

detection direction of 30°).