Model tests of a vector-enhanced dual-throat thrust-vectoring nozzle were performed to obtain the internal flow characteristics

including the internal flow pattern and the static pressure distributions at different secondary flow pressure ratios.The test results indicate that after adding divergent part to the tail of traditional dual-throat vector-nozzle

the jet flow is deflected upwards beyond 20 degrees at a secondary flow ratio of 2.8%.Therefore the design concept of the vector-enhanced nozzle is feasible.In the concave cavity of the nozzle

the static pressure distribution of the vector-enhanced nozzle is basically the same as that of a traditional dual-throat nozzle.At the additional divergent part

the surface pressure of the bottom wall is obviously higher than that of the top wall

accounting for the vector angle augment.In addition

the vector angle increases monotonously with the pressure ratio of the secondary flow

but the vector enhancing effect of the divergent part remains basically unchanged.