多孔質材料を用いた液膜ソールの静特性

概要

論文の詳細を見る
porous materials are widely used as surface materials of hydrodynamic (self-acting) and hydrostatic (externally-pressurized) bearings. In this study, porous materials with such functions are applied to the annular plain seals employed in pumps by inserting ones into the inlet part of the seal. The Reynolds equation for the fluid film in the seal clearance is modified to include a so-called filter term and the effect of tangential velocity slip, and the pressure equation for the porous medium is obtained from Darcy's law and the continuity equation. These equations are applied to the system and are numerically solved with the pressure drop mainly due to the axial acceleration of liquid at the inlet end of the seal being taken into account. It is found that the annular plain seals with porous materials have larger f_k (f_k : fluid film force component along the line of centers) and smaller f_θ( f_θ : fluid film force component perpendicular to the line of centers) than that of ordinary solid annular plain seals owing to the functions of hydrostatic lubrication and inducing seepage of liquid into the porous medium.
一般社団法人日本機械学会の論文
1989-03-25