ОСОБЕННОСТИ РЕАЛИЗАЦИИ ДОПОЛНИТЕЛЬНОГО СТРУЙНОГО ВОЗДЕЙСТВИЯ ВОДЫ НА ЛОПАСТИ ГРЕБНОГО ВИНТА ФИКСИРОВАННОГО ШАГА

Abstract

Oughening the requirements of the international Convention for the prevention of the sea from vessels of 1973, with amendments, demands to reduce the environmental pollution, which can be achieved by maintaining the operational coefficient of energy efficiency of the vessel constant during the voyage. The behavior of the main engine with the fixed pitch propeller in the ship power plant is determined by the operating conditions of the vessel. The dependence of thermal load of the main engine on the operating conditions leads to increased pollution of the environment by fuel combustion products and increased operative ratio of energy efficiency. The control of the thermal and mechanical intensity of the main engine when it is working on a non-nominal screw characteristic, under its “weighting” or “relief", ensures the preservation of the required energy efficiency indicators when operating conditions change. There have been analyzed the methods of implementing the system of additional water jet impact supplied through the slot nozzle of the blade on the propeller to control the thermal and mechanical intensity of the main engine, regardless of the influence of external operating conditions. The design factors dependent on the type of the helical-steering complex of the vessel and affecting the method of liquid supply to the slotted nozzle of the blade have been analyzed. The analysis of the design features of modern fixed pitch propellers, methods of making screw propellers has been given. The main criteria for the system have been determined in order to minimize the negative impact on the propeller system and to lower the useful effect of controlled response on heat load of the main engine. The proposed design of the system of liquid supply to the slotted nozzles of propeller blades is characterized by minimal impact on the propeller unit.