The numerical simulation on convergent flap length

nozzle throat arc radius

divergent flap length and nozzle expansion ratio affecting the internal performance of an axisymmetric convergent-divergent nozzle was conducted by applying a three-dimensional(3-D) viscous flow program that the results of the simulation were compared with that of the scale model experiments.The investigation shows that:convergent flap length and nozzle throat arc radius have some effects on the flow coefficient under the condition of a big convergent half angle

and convergent flap length can be properly reduced on condition that convergent half angle is less than 45 degrees;divergent flap length and nozzle expansion ratio have big effect on the thrust coefficient

and selected divergent flap length and nozzle expansion ratio shall work hard for fully expanded nozzle flow on condition that divergent half angle is less than 16 degrees.