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In the process of steel production, jet stirring is very important, and the core velocity of jet determines the stirring ability of jet. In jet flow, due to the influence of the gas viscosity, the kinetic energy of the jet will be dissipated, which makes the length of the velocity core region unable to reach a large length. In this paper, the adjoint nozzle is set around the main nozzle, which can protect the core jet by adjoint flow, slow down the energy consumption of the core flow and extend the length of the core area of the jet. The results show that the velocity attenuation of the jet with and without adjoint flow is not obvious compared with that of the non accompanying flow. When the temperature of the accompanying flow reaches a certain level, the protection effect of the wake on the core jet is more obvious.