Numerical study on variable area afterburner with wide bypass ratio

To investigate the impact of variable geometry components on the performance of afterburner, the afterburner of triangular variable connotation components was designed, and the effects of the different state points and duct ratio on the total pressure recovery coefficient and combustion efficiency of afterburner were studied by using the CFD numerical simulation. The results show that the change of working state has significant influence on the working performance of afterburner, the total pressure recovery coefficient of the three state points is above 0.96 and the combustion efficiency is above 0.9 under the small bypass ratio, the difference from the performance parameters among the three state points increases with the increasing of bypass ratio, when the bypass ratio is 0.9 to 1.2, the total pressure loss of the afterburner is smaller, the combustion efficiency is better, the total pressure recovery coefficient is the lowest 0.962, the combustion efficiency is the lowest 0.897, and when the bypass ratio is 1.2 to 1.5, The pressure loss of afterburner is in the tolerance range, but the combustion efficiency begins to decrease greatly, and the combustion efficiency is only 0.58 when the total pressure recovery coefficient is 0.941, and when the duct ratio is 1.5 to 1.8, the afterburner is very poor in both pressure loss and combustion efficiency, and the total pressure recovery coefficient is 0.92, while the combustion efficiency is only 0.446.