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首页> 外文期刊>International Journal of Heat and Mass Transfer >Investigations on the penetration length of steam-air mixture jets injected horizontally and vertically in quiescent water
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Investigations on the penetration length of steam-air mixture jets injected horizontally and vertically in quiescent water

机译：水平和垂直注入静态水中蒸汽-空气混合物射流穿透长度的研究

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摘要

Gas submerged jet penetration length is a key parameter for many industrial applications. Many experimental and theoretical works have been performed on pure steam and non-condensable gas submerged jets. However, the steam-air mixture gas submerged jets are not yet fully understood. So, a series of visualization experiments are performed to investigate the effect of air mass fraction, jetting direction, water temperature and inlet pressure on mixture gas submerged jet penetration length. Two flow regimes are distinguished based on the evolution of the interface between water and mixture gas, which are referred to as stable regime and oscillation regime. A flow regime map is developed based on inlet pressure and air mass fraction. A momentum balance model for predicting jet penetration length is proposed. Results show that the mixture gas jet penetration length increases with the increasing inlet pressure and decreases with the increasing air mass fraction. The water temperature has little effect on the jet penetration length. A new correlation for dimensionless vertical jet penetration length is developed based on the form of model analysis. The discrepancy between predicted results and present experimental data is within ±5%. A new correlation for dimensionless horizontal jet penetration length is developed based on experimental results. The discrepancy between predicted dimensionless horizontal jet penetration length and experimental value is within ±18%.
机译：气体淹没式射流的穿透长度是许多工业应用的关键参数。在纯蒸汽和不凝性气体浸没式射流上进行了许多实验和理论研究。然而，蒸汽-空气混合气体浸没射流尚未完全被理解。因此，进行了一系列可视化实验，以研究空气质量分数，喷射方向，水温和入口压力对混合气体浸没式射流穿透长度的影响。基于水与混合气体之间的界面演化，区分了两种流动状态，分别称为稳定状态和振荡状态。基于入口压力和空气质量分数绘制了流态图。提出了用于预测射流穿透长度的动量平衡模型。结果表明，混合气体的射流穿透长度随着入口压力的增加而增加，而随着空气质量分数的增加而减少。水温对射流穿透长度影响很小。基于模型分析的形式，建立了无量纲垂直射流穿透长度的新关联。预测结果与当前实验数据之间的差异在±5％之内。基于实验结果，建立了无量纲水平射流穿透长度的新关联。预测的无量纲水平射流穿透长度与实验值之间的差异在±18％之内。

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