Abstract
The dynamic characteristics of supersonic double-parameter jets and their interaction with the molten pool were experimentally studied. The effects of jet inclination angles and gas flow ratios on gas intensity, coalescence characteristics, and dynamic parameter distributions were discussed. The characteristics of the cavity formed by the interaction of the jet and molten pool were revealed. The results show that the jet inclination angle has more influence on the jet coalescence compared with the gas flow rate. However, the gas flow ratio plays a decisive role in the velocity distribution along the jet centerline compared with the jet inclination angle. The velocity peaks of the double-parameter jets were obviously different at fixed axial distances. Compared with other variables, the small-nozzle inclination has a greater impact on the cavity diameter, while the large-nozzle flow ratio has a greater impact on the cavity depth. The depth and width of the cavity formed by the double-parameter jets are more advantageous than that formed by the single-parameter jets. Furthermore, the double-parameter jets were applied to the actual smelting of a 260t converter.
Highlights
In many industrial engineering applications, the impingement of a high-speed jet onto a liquid surface is commonly encountered
Two jets from the main pipe of the gas tank were used for the jet test experiment and water model test experiment, respectively
When the multi-nozzle jets proceed, the center of each individual jet gradually deviates from its nozzle axis and tends to converge into a whole
Summary
In many industrial engineering applications, the impingement of a high-speed jet onto a liquid surface is commonly encountered. Increased demand for improving production efficiency and reducing cost, these normal jets cannot provide satisfactory solutions for further optimization of the device due to their inherent characteristics and limitations in operational factors and for controlling metallurgical performance. These problems have resulted in the consideration of novel jets for improving the dynamic performance, and an important innovative design, namely, “double-parameter jets,” has been developed. The following three aspects were discussed in detail: (i) characteristics of jet dynamics including jet trajectory, velocity along an individual jet centerline, radial distribution of jet velocity, and effective impact area; (ii) interaction between the double-parameter jets and the molten bath including the splashing capacity, cavity shape, and cavity size; and (iii) metallurgical properties in the actual smelting process
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