Small propeller duct and design method and related assemblies thereof

The embodiment of the invention discloses a small propeller duct, a design method thereof and related assemblies. The design method of the small propeller duct comprises the steps that S101, optimizing initial pressure distribution of an initial airfoil profile of the propeller duct according to constraint conditions and a design state to obtain target pressure distribution; S102, calculating theactual pressure distribution of the current airfoil of the propeller duct based on a CFD flow field solving method; S103, calculating a pressure residual value representing the difference between thetarget pressure distribution and the actual pressure distribution; S104, judging whether the pressure residual value is smaller than or equal to a set threshold value or not; S105, if not, reversely calculating a reverse correction amount required by the current airfoil based on a Takanashi margin correction method, correcting the current airfoil according to the reverse correction amount and thenreturning to the step S102