Designing of Optimal Annular Nozzles with Multiphase Flows

The problem of profiling of optimal (i.e. securing maximum value of thrust) configurations for annular nozzles of the external expansion with a multiphase medium is considered. Direct methods of a calculus of variations are applied to the solution of a problem in view. The variational problem of search of an optimal annular nozzle configuration is reduced to a problem of a nonlinear programming. Optimal configurations of annular nozzles for different working mediums and operating conditions were built as a result of optimization. The result may be used for searching of the optimal configuration of different gas-dynamic devices.