The field of research in this article is small-capacity hydropower conversion plants. The object of the study is the turbines of low-pressure micro hydro power plants (micro HPP) that convert the energy of velocity head into electrical energy. The purpose of the study is to study the features of the operation of rotary turbines and determine the dependence of the rotational speed on the load and efficiency. The influence of the central gap in the turbine blades on its efficiency was also evaluated. During the research, the results of three-dimensional modeling of three types of hydraulic turbines using the Kompasflow software product and the results of experimental studies obtained on a specially created hydraulic stand were used. Based on the results obtained, it was found that, regardless of the types of turbines under consideration, the rotational speed decreases with increasing load, and there is a certain load interval at which the maximum efficiency is achieved. The presence of a central gap in the turbine blades does not lead to a significant increase in the efficiency of the turbine.

The invention relates to hydropower installations, which are designed to convert hydraulic energy into electrical energy. Birotornaya implies the presence of two rotating hydraulic turbines simultaneously rotating the rotor and stator of the hydrogenerator relative to each other in opposite directions, thereby increasing the frequency of crossing the electric winding of the generator by the magnetic field, which makes it possible to increase its power and reduce the weight and overall dimensions. The invention may be promising for providing electricity to small autonomous facilities located in remote foothill and mountainous areas. The objective of the invention is to improve designs, increase efficiency and improve the energy performance of birotor type hydropower plants.

This paper is dedicated to comparative analysis and description of a micro hydroelectric power plant with bi-rotor hydro generator. Based on the characteristics analysis, this paper describes a renewable energy source for a small watercourse; the feasibility of micro hydroelectric power plants with bi-rotor hydro generator is demonstrated. The features of their operation require in-depth research to substantiate parameters of such installations. This paper presents the analysis of the usage of micro hydroelectric solutions with bi-rotor hydro generator. The lattice theory problem was solved, which made it possible to determine the shape of the profile according to a given law of velocity distribution (pressure) on the contour. The experimental stand was developed, and the experiments were conducted to identify the dependence of the frequency of rotation from the flow and the dependence of the rotational frequencies of hydro turbines from various loads. Based on the results obtained, the optimum values of the rotational speed were identified. Presented results of experimental research are of significance and can be applied practically in design of micro hydroelectric power plants with bi-rotor hydro generator. Keywords: Bi-Rotor Hydro Generator; Differential Equation; Rotational Flows; Function; Hydraulic Models; Kinetic Energy; Renewable Energy Sources; Velocity Measurements. This paper is dedicated to comparative analysis and description of a micro hydroelectric power plant with bi-rotor hydro generator. Based on the characteristics analysis, this paper describes a renewable energy source for a small watercourse; the feasibility of micro hydroelectric power plants with bi-rotor hydro generator is demonstrated. The features of their operation require in-depth research to substantiate parameters of such installations. This paper presents the analysis of the usage of micro hydroelectric solutions with bi-rotor hydro generator. The lattice theory problem was solved, which made it possible to determine the shape of the profile according to a given law of velocity distribution (pressure) on the contour. The experimental stand was developed, and the experiments were conducted to identify the dependence of the frequency of rotation from the flow and the dependence of the rotational frequencies of hydro turbines from various loads. Based on the results obtained, the optimum values of the rotational speed were identified. Presented results of experimental research are of significance and can be applied practically in design of micro hydroelectric power plants with bi-rotor hydro generator.