NOZZLE FOR DEVICE TO INJECT OXYGEN AND TECHNOLOGICAL GASES AND INVERSE DIMENSIONING METHOD

摘要

Nozzle for device to inject oxygen and technological gases used in metallurgical processing of metal melting, the nozzle being suitable to emit a gassy flow at supersonic velocity, the nozzle having a conformation symmetrical to a central axis (x) defined by a throat (12) arranged between the inlet and the outlet, the throat (12) defining an upstream part with a convergent development and a downstream part with a divergent development which ends in the outlet mouth (11), the nozzle (10) with the convergent/divergent development having a geometry such that the fall in pressure of the gassy flow from inlet to outlet has a hyperbolic tangent development. Dimensioning method for the nozzle as above, the method providing an inverse dimensioning approach wherein the geometry of the nozzle (10) is adapted to the natural profile of the fall in pressure of the gassy flow according to a hyperbolic tangent development, thus obtaining an optimum variation of the aerodynamic parameters according to the natural laws of expansion.