Numerical investigation was performed to study the influence of outlet delta-chevrons on the aerodynamic and infrared characteristics of a spherical convergent two-dimensional nozzle in turbofan engine exhaust system. Results showed that the trust coefficient and total pressure recovery coefficient decreased by the outlet shaped-chevrons in relative to the baseline nozzle

especially for the larger base angle of delta-chevron. By comparison

the inner-recessed-chevron mode had a least influence on the aerodynamic performance of exhaust system. However

it resulted in an obvious enhancement both for the exhaust plume and total infrared radiation at the detective angle in the vicinity of ±15°. The outer-extended-chevron mode had a most influence on the aerodynamic performance of exhaust system. The equal-area-chevron mode with a base angle of 30° seemed to be advantageous

as it had a weak influence on the trust coefficient and total pressure recovery coefficient

and also showed certain infrared radiation suppression in the detective angles of -30°-0° and 0°-30°.