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集束氧槍環流布置模式對射流流場影響規律研究

Effect of shrouding nozzle arrangement on the flow field characteristics of coherent jet

  • 摘要: 為進一步提高集束氧槍對熔池的沖擊攪拌效果, 重點分析了在兩種環境下, 不同環流布置模式對超音速氧氣射流流場與沖擊能力的作用效果.通過對比在高溫噴射試驗與數值模擬研究結果, 分析射流軸向速度與射流總溫流動狀態, 研究不同環流布置模式下集束射流沖擊特性.通過分析不同數量網格的可靠性, 選取合適的數值模擬模型, 并采用渦耗散概念模型和多步燃燒反應機理計算超音速狀態下氧氣與甲烷的混合與燃燒過程.研究結果表明數值模擬結果與高溫噴射試驗數據吻合程度較好.環流布置對拉瓦爾管出口流速無明顯影響, 主氧射流核心段隨環流孔徑與主氧射流間距的增大, 有先提高后下降的趨勢, 且不同環流布置模式對主氧核心段均有延長效果.

     

    Abstract: The coherent lance technology is widely used in the electric arc furnace (EAF) steelmaking process.It achieves a better metallurgical effect compared with the conventional supersonic lance technology.Herein, to further improve the stirring ability of the coherent lance, the effects of shrouding nozzle arrangement on the flow field and stirring ability of coherent jet were analyzed under two environment temperatures.Based on the results of the numerical simulation and combustion experiment, the characteristics of axial velocity and total temperature distributions has been introduced for researching the impaction ability of coherent jet using various shrouding nozzle arrangements.The appropriate simulation model was built by testing three types of mesh levels.The eddy dissipation concept (EDC) model and chemical kinetic mechanism were adopted to represent the combustion reactions of the O2-CH4jet flame in the numerical simulation process.Resultsreveals that the numerical simulation data shows good agreement with combustion experiment.The initial velocity at the exit of main oxygen Laval nozzle does not change with different shrouding nozzle arrangements.With increase in the distance between the main oxygen and shrouding nozzles, the length of the velocity potential core first increases and then reduces.Moreover, all shrouding nozzle arrangements increase the length of velocity potential core.

     

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