Research and modeling of the cooling system in steam turbine bearings

Abstract

A new porous cooling system in which coolant supply is produced by the combined action of capillary and gravitational forces, is proposed and studied for various technical devices and systems developed by the authors. Cooling surface is made of stainless steel, brass, copper, bronze, nickel, glass and alundum. The wall thickness was (0,05 - 2)∙10-3m. Visual observations were carried out by using high-speed cameras filming using SCS-IM. Experiments are carried out with water at pressures (0,01 - 10) MPa, sub cooling (0 - 20) K, excess liquid (1 - 14) of steam flow, thermal load (1 - 60)∙104 W / m2, temperature pressure (1 - 60) K and the system orientation (±0 ±90) degrees. The influence of liquid flow on heat exchange in porous materials has been studied. Calculated formulas for optimal fluid flow depending on the heat load and the type of porous structure are obtained. The design principles porous structures of evaporators are constructed. The mechanism of the vaporization process in the proposed porous cooling system using internal boiling characteristics is described.

Keywords

• Bearings turbines
• modeling
• cooling system
• temperature
• capillary-porous structure