Subsonic/supersonic jet spraying gun for molten pool smelting side blowing

The invention relates to a subsonic/supersonic jet spraying gun for molten pool smelting side blowing, and belongs to the technical field of metallurgy. The subsonic/supersonic jet spraying gun for molten pool smelting side blowing comprises a gun body, a nozzle, an outer sleeve, a refractory material layer, a gas way and a gas inlet; the gun body is arranged on the outer periphery of one side of the side wall of the furnace body, and is provided with the outer sleeve; the nozzle is arranged on a port of one end of the gun body; the refractory material layer is arranged on the surface of the nozzle; the gas way is transversely positioned in the middle position in the gun body, and is communicated with the nozzle; the gas inlet is formed in the upper side of the gun body, and is communicated with the gas way; the gas inlet is tightly connected with a gas supply pipeline; and the gas way takes the shape of a Lavel nozzle expanding after shrinking. An air flue of the spraying gun adopts the Lavel nozzle, so that