... This paper presents the analysis of the performance for various ducted propellers using a hybrid numerical method, which couples a vortex lattice method (VLM) for the analysis of propellers and a Reynolds-Averaged Navier-Stokes solver for the prediction of the viscous fluid flow around the duct...

... Potential propulsors for current applications may vary in complexity from traditional open propellers to podded propulsors, multiple blade-row ducted units, and waterjets. In the past, the lifting-line theory has been an effective tool in establishing the principal characteristics of an optimum...

.... electrical industrial apparatus subsea system thruster good agreement turnock sr propeller tip diameter duct application panel method section shape southampton optimisation numerical model hydrodynamic propeller experimental data method workshop interaction wake contraction Design...

... thrust coefficient duct coefficient water tunnel high speed ship ventilated waterjet cavity propeller propulsor torque coefficient VENTILATED WATERJETS FOR HIGH SPEED SHIPS J. F. McMahon1(V), C. M. Dai1(V), S. Gowing1(M), G. Lin1(V), F. P. Peterson1(M) ABSTRACT A ventilated waterjet (VW...

... This paper describes a potential-based panel method formulated for the prediction of the steady performance of a waterjet propulsor. The method employs normal dipoles and sources distributed on the solid surfaces such as the impeller/stator blades, hub and duct, and normal dipoles in the shed...

... solvers. This methodology can be applied to both axisymmetric and three-dimensional afterbodies. A ducted preswirl integrated propuls01· will be used as an example to demonstrate the design procedure. upstream oil & gas circulation thickness calculation afterbody design process design...

... A special procedure is presented to account for the influence of the flow through the tip gap of a ducted propulsor when the analysis of the ducted propulsor is performed using a boundary element method. Boundary element methods or panel methods have achieved a high /eve/ of refinement over...

... A method is presented for the three-dimensional inverse design of single or multi-blade row ducted propulsor blades for a specified blade circulation in axisymmetric inlet shear flow conditions. The method computes the flow through the duct and the propulsor blades simultaneously...

... Several computational approximations for the hydrodynamic design and analysis of ducted propellers are developed, with the objective of capturing the important flow physics of ducted units within computer codes suitable for preliminary design use. Applications to both steady and unsteady flow...

... A systematic procedure for the design of a class of marine propulsors is described. This class of propulsors includes traditional propellers, ducted propellers, contra-rotating propellers, vane-wheel propulsors, and propellers operating with pre-or post-swirl stators. The topic of optimum...

... A method is developed to analyze the flow around a ducted propeller operating in combination with a set of pre-swirl stator vanes. The method uses a boundary element method to solve for the flow around the duct and the hub and a lifting surface vortex lattice method to solve for the flow around...

... During the past ten years, the world’s shipping business has been affected greatly by the increasing price of fuel. Energy-saving research has been increased in order to find ways of reducing operating costs of ships. Wake equalizing ducts. Grim wheels, rudder--balls added thrust fins. reaction...

... The design of a ducted propeller operating behind a body of revolution is a complex problem which requires design iterations in order to achieve suitable self-propelled conditions. The interaction of stern and propulsor cannot be handled in a traditional way for the case of a very full afterbody...

... A numerical approach to determine the optimum circulation distribution of a propeller inside a given duct 18 presented. The propeller blades are modelled by lifting lines. The duct is represented in non-linear theory by using a potential based panel method. The propeller lifting lines...

... The paper presents an outline of a new theoretical method for the calculation of the off-design performance characteristics of ducted propellers. The model for the duct performance calculation is an advanced non-linear model based on surface vorticity distribution techniques. The propeller model...

... The unsteady lifting surface theory has been utilized in the study of the hydrodynamic interaction of a propeller and enshrouding nozzle when both lifting surfaces are immersed in a non-uniform inf low field (hull wake). The actual geometry of propeller and enshrouding duct, including...