Numerical study of a dual-throat fluidic thrust-vectoring nozzle

Fluidic thrust vectoring technique is an advanced thrust vectoring concept, it has many potential benefits, such as light weight, control convenience, low manufacturing cost and high ratio of thrust to weight, comparing with conventional mechanical thrust vectoring technique. The effects of several flow parameters on the internal flow of the dual-throat fluidic thrust-vectoring nozzle (DTN) are analyzed by numerical simulation method. The results indicate that DTN can provide high thrust vectoring efficiency with nozzle pressure ratio (NPR) of 3~4 (system thrust ratio arrives 0.968, discharge coefficient 0.93) under non-vectoring thrust state. Increase in NPR decreases system thrust ratio rapidly. When NPR is constant, thrust angle increases with the increase in the secondary injection flux under vectoring thrust state. However, discharge coefficient, system thrust ratio and thrust vectoring efficiency will decrease simultaneously. When the secondary injection flux is constant, thrust angle decreases with the increase in NPR, whereas discharge coefficient may increase lightly, and system thrust ratio first increases and then decreases.