Abstract:

The feasibility of counterflow scheme is validated by research on the internal aerodynamic characteristics of nozzle using numerical simulation. Without vectoring, the discharge coefficient achieves 99.2% and the thrust coefficient achieves 98.8% at the exit of main nozzle. With vectoring, the thrustvector angle exceeds 20°. The decline of thrust coefficient is less than 3.7%, and the maximum percent of the secondary weight flow rate to the primary weight flow rate is just 2.1%. Moreover, some basic flow characteristics of the scheme have been conducted. And the flow structures are discovered by a material explaination of the relationship between the percent of the secondary weight flow rate to the primary weight flow rate and the thrust vectoring angle. The characteristics of turbulent energy and eddy of counterflow shear layer are attained.

Key words: fluidic , thrust , vectoring , nozzle,  , counterflow , shear , layer,  , flow , control,  , suction , secondary , flow,  , flow , structure