Research On The Hydrodynamic Performance Of Hybrid CRP Podded Propulsion

The large-scale and high-speed ship is a significant development tendency of theshipbuilding industry, the limitations of traditional propulsion mode is more and moremarkedly, as the ship power source, the propulsion system receives wider attention, hybridCRP podded propulsion is a new-type propulsion which integrates the design concept ofcontra-rotating propellers to pod module, because of it’s comprehensive technical advantagesof the contra-rotating propellers and the podded propulsion, such as lower vibration noise,higher propulsive efficiency, good stability,etc, it is endowed with a promising future, so it issignificant to research on it’s hydrodynamic performance.Based on the study of the ordinary podded propulsion and single propeller propulsion,the purpose of this paper is to build the numerical model of the hybrid CRP poddedpropulsion and analyse it’s hydrodynamic performance variability compared to ordinarypodded propulsion. The MRF model is used to simulate the mutual interference betweensupport and propeller in the hydrodynamic performance calculation of ordinary poddedpropeller, the computational domain and meshing, boundary condition settings and thesolving methods are introduced in detailed, finally the calculation data is consistent withexperimental data, the results also shows the correctness of calculation methods, then theMRF model is used to calculate the single propeller. Based on these data and experience, thehydrodynamic performance of hybrid CRP podded propulsion including open-water effiency,pressure distribution and fluid field characteristic is analysed in detailed, the hydrodynamicperformance diffrence between hybrid CRP podded propulsion and ordinary poddedpropulsion is dicussed.Then the unsteady hydrodynamic performance is predicted by movingmesh method, and the regular of force and torque variation following the change of therotation angle is analysed, in the end, the influence of space between two propellers andformer propeller blade numbers on the hydrodynamic performance of hybrid CRP poddedpropulsion is researched.