CALCULATION OF COMBINED HYDROSTATIC BEARINGS OF DOUBLE TYPE AT STATIONARY EXTERNAL LOAD

Abstract

The relevance of the application of combined hydrostatic bearings of the twin type in various units and power plants is shown, the loads in which reach ten tons. The most complicated modes of operation of rotor supports associated with starting and stopping are described. The current method for improving the liquid friction regime at nuclear power plants, associated with the use of auxiliary containers with a working fluid, which are set at a certain height, provides the working fluid to the bearings by gravity and thus improves the friction regime. The design of a combined bearing is proposed that improves the operation of turbines in the start-up and shutdown modes and allows for the abandonment of additional containers with working fluid, and also increases the reliability and durability of turbine operation. It is the objective of this work, which consists in calculating characteristics of a combined hydrostatic bearing tandem type, providing reliable operation of the turbine in all possible modes of its operation. Shows a structural scheme of the combined hydrostatic bearing tandem type and the principle of its operation is described in case of overloads, failure of hydraulic fluid supply system as well as to start and stop modes, these modes are included in the operation of hydrostatic bearings instead of bearings. Theoretical dependences have been developed that allow determining the main characteristics of a combined hydrostatic bearing of a dual type with a stationary external load. It is shown that the basis for determining the characteristics of the bearing is the function of the distribution of pressure along the working surface of the bearing, by means of which the bearing capacity of the bearing, the flow rate of the working fluid and the loss of power for friction are determined. A mathematical model is presented, brought to a kind adapted for numerical realization. The most rational numerical methods for implementing mathematical dependencies are applied. A generalization of the mathematical model to the case of non-laminar flow of a working fluid is carried out using the turbulence coefficients proposed by V. N. Konstantinesku. The analysis of the results of calculation of combined hydrostatic bearings of a twin type in a wide range of external loads and bearing diameters is given