Study on mechanism of lubrication in porous journal bearings (static characteristics of porous journal bearings with sealed ends at start of operation)

摘要

A theoretical investigation of static characteristics at the start of operation is develoepd for a porous journal bearing with sealed ends lubricated only by the oil initially provided within its structures. numerical results show that a negative pressure region exists in the porous matrix just below the oil-film rupture zone. Hence, air penetrates into the porous matrix at the oil-film rupture zone as the oil in the porous matrix moves inwards, which causes the reduction of oil content within the porous matrix.