A Comparative Study of Dual Throat Nozzles for Fluidic Thrust Vectoring Applications

Thrust vectoring is the technique by which the jet coming out of the nozzle is made to deflect to control the vehicle. Fluidic thrust vector control by dual throat nozzle is found to have the highest thrust efficiency with minimum pressure losses. The present study involves the design and simulation of a dual throat nozzle (DTN), a DTN with injection (I-DTN), and a bypass dual throat nozzle with a V-shaped bypass duct (V-BDTN) and with an arc-shaped bypass duct (A-BDTN). The arc-shaped bypass duct design idea is taken from the author Wu and Kim (J Mech Sci Technol 35:3435–3443, 2021). It is found that I-DTN has the highest deflection angle of 12° for NPR = 4 and the highest coefficient of the thrust of 0.96. But implementing DTN with injection has the starting problem as mentioned in the research literature. To overcome this, A-BDTN and V-BDTN are introduced. Also, A-BDTN’s coefficient of thrust is very close to that of a DTN which means the thrust penalty for vectored state is negligible.