As a mixed exhaust nozzle was taken as the research object

the mapping relation between the arbitrary shape deformation volume and a mixed exhaust nozzle sketch was built. Through movement of the control points

synchronously large curvature deformation of the profiles and grid was realized. Whats more

experimental samples were established with application of the optimal Latin hypercube design (OLHD) method. On this basis

as the free form deformation (FFD) and CFD modules were driven by the Isight software

all the sample points were calculated. According to the simulation results

optimum sketch was selected with 0.6% increase of the thrust coefficient and 0.6% reduction of the total pressure loss. Finally

multi-lines and arcs were adopted to parameterize the optimum sketch with no performance degeneration

which can be used in engineering practice.