Nozzle and additive manufacturing apparatus

A nozzle comprising:

• a nozzle unit including an inner surface facing an outer side of an axis in a radial direction and an outer surface facing the inner surface with a space therebetween in the radial direction, and including a first passage that is distanced from the inner surface on an inner side in the radial direction, that extends along the axis, and through which an energy ray passes, and a second passage provided between the inner surface and the outer surface, and through which powder and fluid pass, wherein
• the first passage includes a first open end that is positioned on an end of the first passage in a first direction along the axis, and that opens to outside of the first passage,
• the second passage includes a second open end that is positioned on an end of the second passage in the first direction, that is more distanced from the axis than the first open end, on an outer side in the radial direction, and that opens to outside of the second passage,
• a first surface, that is the outer surface, includes a first edge that is positioned on one end of the first surface in the first direction,
• a second surface, that is the inner surface, includes a second edge that is positioned on one end of the second surface in the first direction, and that is distanced from the first edge on a side toward the first direction, in a direction along the axis,
• the nozzle unit ejects the fluid from the second open end so that the fluid flows along the second surface and departs from the nozzle unit with a flow separation at the second edge,
• the nozzle unit includes a first tubular portion including the inner surface and provided with the first passage, and a second tubular portion including the outer surface, and
• an end of the first tubular portion in the first direction is distanced from an end of the second tubular portion in the first direction on a side toward the first direction, in the direction along the axis.