Investigation on a hybrid SVC nozzle and coupling performance estimation with aero-engine

Higher vectoring efficiency is an important persuit of fluidic thrust vectoring (FTV) technology and has been focused on for decades. In the paper, a new conception of FTV was proposed by combining shock vector controlling (SVC) and a rotatable valve, named as a hybrid SVC nozzle. The working principle was discussed, and flow mechanism of a hybrid SVC nozzle, based on transverse injection in a confine space and mechanical control, was investigated numerically by solving 3D RANS equations. A coupling model of a hybrid SVC nozzle and aero-engine was conducted using design of experiment (DOE), response surface methodology (RSM) and aero-engine simulation program. Results show that, a vector efficiency of 2.91°/% (vector angle per secondary flow ratio) of a hybrid SVC nozzle was obtained. When extracting secondary flow of 5.3% from fan exit to a hybrid SVC nozzle, it caused thrust of aero-engine to decrease by 5.6%, SFC to increase by 0.5% and vector angle 14.1°.