A computational study of 2-D dual-throat fluidic thrust-vectoring nozzles

Numerical studies on 2-D dual-throat fluidic thrust-vectoring nozzles were performed to obtain the key design rules.Results show that length of primary nozzle cavity,divergent cavity ramp angle,convergent cavity ramp angle and height of upstream primary nozzle throat have great influence on thrust ratio,thrust vectoring efficiency and the internal flow patterns.The optimal package of parameters is: 2.61,10°,30°,1.0 and 150°,respectively(the length scale is normalized by the height of downstream primary nozzle throat).This package can achieve a pitch thrust vector angle of 14.34° and a thrust ratio of 0.967 in the case of a primary flow pressure ratio 4,secondary/primary flow pressure ratio 1.08 and mass consumption of 2.5%.