Supersonic jet characteristics of oxygen lance nozzles have a significant influence on smelting; however, presently, little research has been carried out to investigate the influence of wear on the jet characteristics at the nozzle exit. A numerical model and aerodynamic testing platform were developed to analyze supersonic jet characteristics under different inlet pressures and wear levels at the nozzle exit. The numerical model was first validated by comparing the numerical results with the measured data of the aerodynamic testing experiment. Then, the effects of the inlet pressure and nozzle exit wear on the jet velocity and degree of aggregation were studied. An increase in the nozzle inlet pressure is conducive to an increase in jet velocity but also causes earlier jet convergence. An increase in the nozzle exit wear results in the faster attenuation of jet velocity, not only reducing the jet velocity but also leading to an earlier convergence point for each jet. The results of this study can provide theoretical support for the design of an oxygen lance nozzle and process optimization of smelting in industrial application.

中文翻译：

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喷嘴出口磨损对超声速氧枪流体流动特性的影响

氧枪喷嘴的超音速射流特性对熔炼有显着影响；然而，目前，关于磨损对喷嘴出口处射流特性的影响的研究很少。建立了数值模型和气动试验平台，分析了不同入口压力和喷嘴出口磨损水平下的超音速射流特性。首先通过将数值结果与空气动力测试实验的测量数据进行比较来验证数值模型。然后，研究了入口压力和喷嘴出口磨损对射流速度和聚集度的影响。喷嘴入口压力的增加有利于射流速度的增加，但也会导致更早的射流收敛。喷嘴出口磨损的增加导致射流速度的更快衰减，不仅降低了射流速度，而且导致每个射流的更早收敛点。该研究结果可为氧枪喷嘴的设计及工业应用中的冶炼工艺优化提供理论支持。