Анализ работоспособности радиальных подшипников скольжения турбомашин на водяной смазочной жидкости

Abstract

Предложено в качестве альтернативной смазочной жидкости в опорах скольжения турбин ТЭС и АЭС использовать воду. Проведены экспериментально-теоретические исследования радиальных подшипников при смазывании их водосодержащей жидкостью. Численные исследования выполнены на базе трехмерного неизотермического течения смазочной жидкости в зазоре радиального подшипника с учетом теплообмена между смазочным слоем и ограничивающими его элементами подшипника. Малая вязкость воды обуславливает турбулентный режим течения, что было учтено при помощи модели Рейхардта.The purpose of studies described in this scientific paper was to investigate the mechanisms of the behavior of thermal and hydrodynamic processes that occur in slide bearings in water and their influence on the reliability and operation efficiency of friction bearings in different modes of turbine operation and also to develop reliable techniques for the design of bearings based on up-to-date achievements of the theory of lubrication. Lately, the problem of the use of alternative lubricating liquids for the slide bearings of TPS and NPS turbines becomes more and more vital. This problem is vital because the fire safety and ecological safety of power stations should be increased and because of the deficiency of oils. One of the possible trends in the solution of this problem is related to the use of water lubricating liquid for the lubricating systems of turbogenerators. The experimental and theoretical studies of radial bearings lubricated with the water-containing liquid have been carried out. Numerical studies were carried out using the three-dimensional nonisothermal flow of the lubricant liquid in the radial bearing clearance taking into account the heat exchange between the lubricating layer and the bearing elements restricting it. A low viscosity of water provides turbulent mode of the flow, which was taken into account using the Reyhardt model.