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Pump jet propulsion (PJP) is a widely used propulsion method for underwater vehicles. Compared with traditional propeller propulsions, it has the characteristics of higher propulsion efficiency, lower noise, and better performance. A novel propeller with annular blades, named as 'the toroidal propeller', is designed and discussed with its characteristic parameters. Then the novel propeller is installed to the PJP and Suboff submarine to evaluate its performance with Computational Fluid Dynamics (CFD) simulations. The high-speed range of modified submarine with the toroidal propeller is also predicted and analyzed through propulsion parameters. The results indicate that when the toroidal propeller is applied to the PJP of underwater vehicle, its propulsion efficiency can reach 0.88 at the speed coefficient of 1.2. When the rotator speed is 5000 RPM, the pump jet thruster with toroidal propellers can continue to provide effective thrust, which will easily cause the speed of submarine to exceed 60 kn. • A novel propeller with annular blades, named as 'the toroidal propeller', is designed and discussed with its characteristic parameters. • Performance comparisons between the PJP with toroidal blades and traditional PJP is conducted and displayed. The results indicate that our PJP has a better hydrodynamic performance. • The modified Suboff submarine with a toroidal propeller is proposed and its hydrodynamic performance is evaluated. Its high speed is clearly more than 60 kn. [ABSTRACT FROM AUTHOR]

Numerical model of hybrid contra-rotating propeller (CRP) podded propulsion is built in numerical cavitation tunnel, and the hydrodynamics performance of hybrid CRP podded propulsion in uniform flow is predicted by RANS formula with SST k-w turbulence model based on sliding mesh method. The predicted results of open-water performance and unsteady performance of hybrid CRP podded propulsion are analyzed. Synchronously, a series of experimental investigations for open-water performance of hybrid CRP podded propulsion are carried out. Pod dynamical instrument and long-axis dynamical instrument are used in cavitation tunnel of the same size. The repeated tests' results are compared well with each other, indicating that the tests are stable. The average value of the repeated tests' results agree well with the prediction results of open-water performance. It is shown that the experimental method and the numerical method presented in this paper have good precision in the prediction of hybrid CRP podded propulsion's open-water performance. The average value of the repeated tests' results and predicted results are compared with the foreign experimental value of the same CRP without pod. The influence of pod on the open-water performance of the forward propeller and the after one are analyzed. It is shown that pod has no influence basically on open-water performance of the forward propeller, but has an obvious influence on the after one. [ABSTRACT FROM AUTHOR]