Radial double-bump foil air bearing

The invention relates to a radial double-bump foil air bearing, and belongs to the technical field of air bearings. In the radial double-bump foil air bearing, a bottom foil, a double-bump foil and a shaft sleeve are sequentially sleeved on the inner wall of a bearing seat; the plurality of double-bump foils are fixed on the surface of the bottom foil, the double-bump foils comprise first bump foils and second bump foils, first bulges are arranged on the surface of each first bump foil, and a first channel is formed between every two adjacent first bulges; a second bulge and a third bulge are arranged on the surface of the second bump foil at intervals, and a second channel and a third channel are formed between the second bulge and the third bulge; in the static state, the first protrusion is attached to the third protrusion, and two fourth channels are formed between the first protrusion and the third protrusion. By arranging the protrusions and the channels of different types, when external air flows throu