The influence of outlet with single chevron on the aerodynamic and infrared performances of a spherical convergent two dimensional nozzle used in turbofan engine exhaust system is analyzed by numerical calculation.Within the range of parameters presented in this study,the results show that:the use of single chevron results in a reduction in thrust coefficients compared to the reference nozzle,and the 90° angle single chevron will cause a greater thrust coefficient reduction.Compared with the reference nozzle,the speed attenuation caused by the expansion of the velocity core area of the single chevron nozzle exit wake is more rapid.Single chevron affects the infrared radiation intensity of the wake in the direction 15° from the center of the nozzle to both sides of the main horizontal direction.The overall infrared radiation of the non deflection single chevron nozzle in the horizontal direction is close to the intensity of the reference nozzle,and the single chevron effect is reflected when the nozzle is deflected.At 20° vector deflection,the horizontal 90° detection angle position of the 60° top angle saw tooth nozzle decreases by 95%,and the 90° and 120° angles decrease by 25.6% and 12.3%,respectively.