本期为大家推荐的内容为论文Characteristics of inclined negatively buoyant jet of dense gas leakage《重气泄漏倾斜负浮力射流特性研究》，发表在Physics of Fluids期刊，欢迎大家学习与交流。

在许多地下空间、工业受限空间场景的生产或使用过程中会产生或涉及重气（大比重气体）。一旦发生重气泄漏，具有负浮力的重气倾向于在人员活动区域积聚。本研究基于高速纹影成像实验和大涡模拟，选取二氧化碳和六氟化硫两种典型重气作为研究对象，深入探究了倾斜泄漏源下重气泄漏的特性。研究结果表明，倾斜重气射流上升高度、水平距离以及返回点的稀释度主要受射流角度和密度弗劳德数影响。其中，当气体泄漏角度θ= 60°时，可获得最大稀释比；而当θ=45°时，返回点具有最远的水平距离。同时，基于量纲分析提出了用于估算倾斜重气射流最大上升高度和水平距离的计算模型。最后，得到了倾斜重气射流中心轴线速度和稀释度的半经验公式。

题目：Characteristics of inclined negatively buoyant jet of dense gas leakage(重气泄漏倾斜负浮力射流特性研究)

作者：Yuanqing Ma, Angui Li, Tianqi Wang, Jigang Che, Changqing Yang, Xuan Zhang, Dingmeng Wu

发表刊物：Physics of Fluids

DOI：https://doi.org/10.1063/5.0251179

ABSTRACT

Many industrial products generate or utilize toxic gases. Once a dense gas leak occurs, hazardous gases with negatively buoyant tend to accumulate in areas of human activity. The investigation on characteristics of inclined negatively buoyant jet (INBJ) of dense gas leakage can contribute to hazard assessment and effective elimination. This study explores the characteristics of dense gas leaks from inclined sources on the basis of high-speed schlieren imaging experiment and large eddy simulation. Two dense gases, carbon dioxide (CO2) and sulfur hexafluoride (SF6), were selected as pollutants. The results suggest that the characteristics of INBJ are primarily influenced by jet discharge angle and the densimetric Froude number, including the rise height, distance, and dilution ratio of the terminal and return points. The gas leakage with θ=60° has the maximum dilution ratio, whereas the maximum distance of the return point is achieved at θ= 45°. A model is proposed to estimate the terminal rise height and distance of INBJ based on dimensional analysis. Finally, the semi-empirical formulas of the velocity distribution and dilution ratio were obtained. The reduced gravity of INBJ decreases exponentially from the source to the return point, while the X component of velocity decreases as a logistic function and the Z component of velocity decreases as a linear function. The findings of this study can contribute to the monitoring and assessing the impact of dense gas leakage.

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