In order to reduce the infrared radiation, and to improve the survival rates of the fighter, it is necessary to further enhance the mixing of the nozzle exhaust jet with the ambient air. A novel technology known as air-tab is adopted to enhance the exhaust mixing with the environment air in high bypass turbofan nozzle model. Numerical results show that: l)The technology can flexibly adapt to the every condition of nozzle and keep the best mixing effect all the time, with very little flowfield loss; 2)The parameters present zigzag distribution. 3) High temperature region area has been reduced nearly 50% by the air-tab with the second mass flow rate only about 3% of total mass flow rate.
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