An atmospheric-pressure plasma treatment system includes a plasma source including at least one electrode, a gas in a gas chamber, and an AC power supply that supplies power to the at least one electrode to form a plasma in the gas. A radial-flow surface has a jet nozzle through which the gas flows and the radial-flow surface has a surface profile that conforms to a nonplanar treatment surface of an object. The radial-flow surface is separated from the nonplanar treatment surface by a gap that is less than 2 times a diameter of the jet nozzle so that the gas flows radially outward from the nozzle and between the radial-flow surface and the nonplanar treatment surface.