Numerical investigation for hazardous gas cloud form and dissipation behavior of hydrogen blended natural gas in a confined space

The safety of Hydrogen blended natural gas (HBNG) in confined space is an issue, especially for ventilation process. In this study, leakage and ventilation processes of low pressure HBNG with different hydrogen blended ratio(HBR) in confined space are simulated and validated by experiment based on similarity criteria. For leakage process, the leak direction and HBR does not significantly affect gas accumulation behavior. The required time for gas cloud to fill space decreases slightly with HBR rising and they generally show linear relationship. For ventilation process, the main influences on the leakage process are the total leakage mass and the ventilation conditions. The required time for hazardous gas cloud dissipate increases with total leakage mass and decreases with HBR. For different ventilation conditions, the ranking of required time to exhaust leaked gas is low > center > high > mix. Through the analysis of pressure distribution, it is found time difference is produce..., This study was done using CFD software called fluent. All data were obtained from post-processing of the CFD simulation results. The software chosen for post-processing in this study was Tecplot. The physical variables in the study, except for the hazardous gas cloud volume, can be easily obtained under conditions of some understanding of post-processing. The hazardous gas cloud volume is the sum of the approximate grid volumes, and the method of obtaining it is explained in detail in the manuscript., , # Numerical investigation for hazardous gas cloud form and dissipation behavior of hydrogen blended natural gas in a confined space [https://doi.org/10.5061/dryad.kh18932h8](https://doi.org/10.5061/dryad.kh18932h8) ## Description of the data and file structure 1 The uploaded data are labeled at the file corresponding to the location in the manuscript. 2 Note that some of the data is on the second and third pages of the xls file 3 For units of data, please refer to the notation in the manuscript ### Files and variables #### File: fig6.xlsx **Description:** Comparison of numerical simulation and experiment results. The first column is the leakage time. The second column is the experiment value and the third column is the silumation value. ##### Variables * Leakage time-VOL% #### File: fig7.xlsx **Description:** CH4 volume fraction variation at monitoring point. The first column is the leakage time. The number in the first row refers to the number of grid cells. ##### Variabl...受限空间内掺氢天然气（Hydrogen Blended Natural Gas, HBNG）的安全问题始终备受关注，尤以通风工况下为甚。本研究基于相似准则，对不同掺氢比（Hydrogen Blended Ratio, HBR）的低压掺氢天然气在受限空间内的泄漏与通风过程开展数值模拟与实验验证。 针对泄漏过程，泄漏方向与掺氢比均不会显著影响气体积聚行为。气云充满受限空间所需时长随掺氢比升高略有缩短，二者大致呈线性关系。 针对通风过程，总泄漏质量与通风条件是影响该过程的主要因素。危险气云消散所需时长随总泄漏质量增加而延长，随掺氢比升高而缩短。不同通风条件下，泄漏气体排出所需时长的排序为：低位通风＞中心通风＞高位通风＞混合通风。 通过压力分布分析，可发现时长差异产生…… 本研究采用计算流体动力学（Computational Fluid Dynamics, CFD）软件Fluent开展数值模拟，所有数据均来自CFD模拟结果的后处理流程。本研究用于后处理的软件为Tecplot。除危险气云体积外，本研究涉及的其余物理量均可通过掌握基础后处理流程便捷获取。危险气云体积为近似网格体积的总和，其获取方法在手稿中已有详细说明。 # 受限空间内掺氢天然气危险气云形成与消散特性的数值研究 [https://doi.org/10.5061/dryad.kh18932h8](https://doi.org/10.5061/dryad.kh18932h8) ## 数据与文件结构说明 1. 上传数据均按与论文手稿中对应位置的文件进行标注。 2. 请注意部分数据存储于xls文件的第二、第三页内。 3. 数据单位请参照手稿中的标注说明。 ### 文件与变量 #### 文件：fig6.xlsx **说明：** 数值模拟与实验结果的对比分析。第一列为泄漏时长，第二列为实验实测值，第三列为模拟计算值。 ##### 变量 * 泄漏时长-体积占比（VOL%） #### 文件：fig7.xlsx **说明：** 监测点处甲烷体积分数的变化情况。第一列为泄漏时长，第一行的数值代表网格单元总数。 ##### 变量……