Bump foil hydrodynamic thrust bearing

A rotary machine comprising:

• a housing;
• a shaft rotatable about an axis relative to the housing, and a thrust runner secured to the shaft and extending radially outward from the axis;
• and
• a thrust bearing arranged between the housing and the shaft, the thrust bearing including first, second and third layers, the first layer adjacent to the thrust runner and the third layer adjacent to the housing, the second layer including a corrugated foil arranged between the first and third layers, the corrugated foil including a wall providing peaks engaging the first layer and valleys engaging the third layer, and a depression arranged in the wall between first and second peaks, the depression spaced from the first and third layers, wherein the thrust bearing includes a single corrugated foil layer, wherein the first layer includes arcuate top foils and the third layer includes an annular main plate, a leading edge of the top foils secured to the main plate, the second layer providing arcuate corrugated foils engaging the top foils and the main plate.