Parametric Design Of Additional Thrust Fins And Experimental Analysis

With the increasing emphasis on environmental protection, the International Maritime Organization (IMO) has made harsh restrictions on the ship of energy-saving and emission-reduction. Every country urgently requires the development and application of the ship energy saving technologies to reduce fuel costs and environmental impact. The technology of energy saving appendages is an important part of energy-saving technologies. There are many kinds of energy-saving appendages have been developed from the ’60s, such as catheter before the paddle, impeller, the rudder with additional thrust fins and so on. These devices have varying degrees to improve the propulsion efficiency of the ships. The rotational energy of propeller accounts for about10%of the total energy, and it has great practical significance to research how to recycle this part of the rotation energy.The additional thrust fins are one kind of devices that install on both sides of the rudder and recycle the rotation energy in the wake of the propeller, it has a lot of advantages such as structure simple, easy installation, significant effects, short return period, easy to ship alteration and so on, and it is worth large-scale promotion and application of better economic and social values.This paper summarized and analyzed the results through the existing model tests of both at home and abroad, and theories of surface panel method theory, means of the thick wing theory, nonlinear vortex lattice method, etc to determine the main points of design parameters of the additional thrust fins and the design parameters are divided into impact parameters, shape parameters and positional parameters. Based on CATIA as the design platform, VB as programming language, we developed the design platform of the additional thrust fins by using the method of parametric design, achieved the objective of parametric design of the thrust fins. After that, we used the parametric design platform to design a kind of additional thrust fins for a ship, then, made model test of the thrust fins. Through the analysis of the model test results, we verified the feasibility of the design platform and the energy conservation of the thrust fins installation.