The flow fields

thrust coefficient and infrared radiation characteristics of exhaust systems with funnel-shaped mixer were analyzed

and compared with annular mixer. The flow fields were calculated by Fluent commerical software

and the infrared radiation characteristics were calculated by by reverse Monte-Carlo method. Effects of funnel-shaped mixer on thrust coefficient and infrared characteristics of exhaust system were analyzed. The results show that: (1) When the funnel-shaped mixer is used

low temperature bypass stream is easy to eject into high temperature core stream

and the temperature distribution on cross section of exhaust system is similar to chrysanthemum. (2) When the funnel-shaped mixer is used

the infrared thrust coefficient of exhaust system decreases by 0.2%. (3) When the funnel-shaped mixer is used

the infrared radiation of plume decreases at all detection angles

down by 44.6% at detection angle of 90 degree

meanwhile the infrared radiation of wall increases little at large detection angles.