Study On Manipulation Strategy Of Propulsion System For Wing-assisted Motor Vessel

The assisted-wing, which is made of rigid material, will be installed on the deck of motor vessel, then the wing works as the assisted propulsion system of the vessel, which will push the vessel forward. The assisted propulsion system will make an effect on decreasing the fuel oil consumption as the sailing speed of the vessel is constant. There are many technological challenges to solve before the wing-assisted motor vessel is widely used. The manipulation strategy of the hybrid propulsion system, which includes wings and main engine-propeller, is extremely important. The strategy aims to solve the problem of matching operation of the hybrid propulsion system.Firstly, based on the sailing and force characteristic of wing-assisted vessel, ship manoeuvring mathematical model (MMG) was established in three dimensions, which confirm the mathematical relations of every parts of wing-assisted vessel.Secondly, based on the wind tunnel experiment of the wing, the aerodynamic characteristics were accomplished, and then the aerodynamic coefficients were analyzed. According to the limitations of wind field applicable for wing-assisted vessel, wind field applicable range was solved in two methods of graphs and mathematical equations based on true wind field. The optimizing swing angle of the wings was calculated based on vessel coordinate system. And then, decreasing the optimizing attach angle to avoid aerodynamic stall effectively, which modified the optimizing swing angle of the wings.Thirdly, the matching operation and manoeuvring characteristics of main engine and propeller were analyzed based on modes of constant sailing speed constant power of main engine. The manoeuvring mode of constant rotation speed of main engine in every divided sailing segment was put forward, in which sailing speed was modified. This manoeuvring mode was proved to be practical in theory.At last, the draft angle and rudder angle were calculated in different sailing condition, in which added resistance characteristics were analyzed. Rotation speed of main engine was calculated in different sailing condition based on MMG balance model. The manipulation strategy of wing-assisted vessel propulsion system was made in different sailing speed and wind field as the target vessel in fully loaded. And then, manipulation strategy tables were calculated based on true wind field.The target wing used in the thesis could provide large propulsion force in a wide wind angle range, which proves its high propulsion characteristics. According to the manipulation strategy of wing-assisted vessel propulsion system, rotation speed of main engine and the optimizing swing angle of the wing were calculated in different wind field condition when the target vessel’s sailing speed is 15Kn,12Kn,8Kn and 4Kn. The manipulation strategy made in this thesis can make full use of the wings’assisted propulsion force and also solve the problem of matching operation of the hybrid propulsion system.