Methodology of investigation of thermal-hydraulic processes under the influence of external dynamic forces

In connection with the development of nuclear shipbuilding in the Russian Federation, the need arose for a comprehensive analysis of the processes taking place in reactor facilities, for their modernization, extension of the service life, and increase in technical and economic indicators. The purpose of this work is to create a methodology for studying thermohydraulic processes in ship nuclear power plants under the influence of external dynamic forces. The methodology is based on mathematical and experimental methods. For this, a stand was created for simulating thermohydraulic processes in rolling conditions. The main task that had to be solved was to find the kinematic characteristics of the research stand. So, to analyze the effect of external forces on a thermohydraulic model, it is necessary to know the law of motion of material points of the model, as well as, in general form, the law of distribution of temperatures, the velocity of the flowing medium in the model. In its most general form, this field will be non-stationary and three-dimensional. The rolling law is specified in the form of a harmonic law with dependences on the amplitude and period of oscillations. It is proposed to describe thermohydraulic processes in a system associated with coordinates in a fixed coordinate system when the position of the center of mass of the model changes. It was determined that the form of this trajectory depends on the ratio of periods and amplitudes of oscillations, as well as the phase difference between oscillations. The equations of kinematics were obtained, which are then planned to be used when describing the mathematical model of the stand.