No abstract

The paper considers the possibility of increasing the efficiency of wind power plants through the use of jet mechanization of propeller blades. The study of jet mechanization of the blade was carried out for the aerodynamic profile of NACA 0012 by numerical simulation in the Flow Vision software. The calculations were carried out by solving the plane problem of a completely compressible fluid or gas flow around the blade profile. The results of numerical simulation confirmed the change in the profile characteristics when additional air is supplied to the profile suction surface. The results obtained have been verified with the results of other authors. The data obtained as a result of modeling can be used both in the creation of new wind stations and in the capital improvement of the existing ones.

The analysis of operational and constructive methods for changing the power of the main engine working on a fixed pitch propeller has been carried out. To purposefully change the operating mode of the main engine, additional (special) jet action of water on the propeller blades of a fixed pitch can be used. The physical effect of supplying additional water to the blades and its effect on the effective power of the main engine is explained. The mutual arrangement of the propeller load curves of the characteristic modes of the engine when additional water is supplied to the blades is analysed. The additional modes of operation of the main engine, implemented with the help of an additional jet effect, are determined. Purposeful change in power consumption at a constant speed prevents possible overloading of the main engine in case of deterioration of operating conditions. Of further interest is the assessment of the thermal and mechanical tension of the main engine operating in varying operating conditions.

The choice of the design operational points of the main engine to achieve the design speed of the ship determines the efficiency of the propulsion plant. At the same time, the limits recommended by the engine manufacturer for selecting the design operational points do not fully take into account current trends and can be changed. The problem of the rational use of the nominal power and specified maximum continuous rating power of the main engine operating on a fixed pitch propeller is relevant.