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Effects of Secondary Injection Pipe on Dual Throat Nozzle ThrustVectoring Performances

FAN Zhi-peng;XU Jing-lei;GUO Shuai;Jiangsu Province Key Laboratory of Aerospace Power System,College of Energy and Power,Nanjing University of Aeronautics and Astronautics;  
Numerical studies on 2D dual throat nozzle(DTN)were performed focusing on the secondary injection pipe to get the effects on the DTN's thrust-vectoring performances. Results show that the secondary injection pipe in the convergence and divergence shape can not improve the DTN's thrust-vectoring performances compared with the one with parallel pipe. As the mass of secondary injection increases,the DTN's vector angle has a maximum value and if it is larger than this value,it will lead to the reduction of the DTN's thrust-vectoring performances. The width of the secondary injection pipe has significant effects on the DTN's performances.The maximum vector angle of the DTN does not vary in different width of the secondary injection pipe. The DTN can get a larger vector angle with a low mass ratio of the secondary injection when the width of pipe is small,but the total pressure of the secondary injection is relatively high. Increasing the width can reduce the secondary injection total pressure,but the vector angle the DTN can get will be lower.
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