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On penetration depth of an oxidizing agent jet into the melt of LD-converter

Journal: Reporter of the Priazovskyi State Technical University. Section: Technical sciences (Vol.30, No. 1)

Publication Date:

Authors : ; ;

Page : 122-135

Keywords : a tuyere; nozzle; supersonic flow; melt; penetration depth;

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The influence of discharge regime parameters (full pressure differential, surplus impulse, consumption etc.) through the tuyere nozzles and their design on change of the subsonic jet with natural initial degree of turbulence penetration depth and the supersonic jet under discharge conditions without acoustic-feedback into the melt through the nozzles with various Mach numbers, the generatrix and the supersonic widening nozzle forming an angle, at different distances from the melt surface and the slag layer have been analyzed. The received relations agree very closely with experimental data received both from models and in practice. Thus the penetration depth is peak at the nozzle, in which pressure differential given gas expansion being maximum. However penetration depth functional dependence on Mach number is such that Mach number decreasing substantially, the penetration depth decreasing little. With the nozzle expansion angle increase the jet penetration depth decreases over the total range of the pressure differential drop. degree off-design). From the analysis of the received data it should be noted, that the dimensions of the interaction zone decrease both in width (the crater diameter) and in penetration depth if there is a slag layer. It also points to the fact that if there is a slag layer the degree of the oxygen assimilation by the melt decreases as well as the metal mass joining the downward jet of the oxidizer while the carbon critical concentration grows. The received dependences of the jet penetration depth into the melt on such various factors as: discharge regime parameters, blowing devices design etc., can be used to select the design peculiarities of nozzles in blowing devices and proper blowing regimes. The given results must be taken into account to design, improve and operate blowing devices

Last modified: 2015-11-26 21:34:55