Spatial and radiative properties of an open-flame hydrogen plume
Spatial and radiative properties of an open-flame hydrogen plume
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DOI：
10.1016/j.ijhydene.2005.11.020
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发表时间：
2006-08
影响因子：
7.2
通讯作者：
R. Schefer;W. Houf;B. Bourne;J. Colton
中科院分区：
文献类型：
--
作者：
R. Schefer;W. Houf;B. Bourne;J. Colton
相当大的努力是针对更新安全规范和标准，为氢作为消费能源的生产、分配和零售做准备。在本研究中，测量进行了大规模的，垂直火焰的尺寸和辐射特性的特点点燃氢射流。这些数据与高压氢安全壳突然泄漏的安全情景有关。具体来说，这些数据将为确定与氢储存和配送中心的意外释放相关的危险长度尺度提供技术基础。采用可见光、红外视频和紫外火焰发光成像技术对火焰长度、直径和结构进行了测量。辐射计测量允许确定从火焰的辐射热通量。结果表明，火焰长度随射流总流量和喷嘴直径的增大而增大。当绘制为弗劳德数的函数时，弗劳德数测量射流动量和浮力的相对重要性，在一系列操作条件下测量的火焰长度塌陷到相同的曲线上。与碳氢化合物射流火焰长度的良好比较，证明了无量纲相关性是有效的各种燃料类型。氢火焰的辐射热通量的测量显示出良好的协议与无量纲的相关性和标度律开发的燃料和火焰条件的范围。这一结果验证了这种相关性可以用来预测辐射热通量从各种各样的氢火焰，并建立了一个基础，预测先验的特性，由意外释放造成的火焰。
Considerable effort is being directed toward updating safety codes and standards in preparation for production, distribution, and retail of hydrogen as a consumer energy source. In the present study, measurements were performed in large-scale, vertical flames to characterize the dimensional and radiative properties of an ignited hydrogen jet. These data are relevant to the safety scenario of a sudden leak in a high-pressure hydrogen containment vessel. Specifically, the data will provide a technological basis for determining hazardous length scales associated with unintended releases at hydrogen storage and distribution centers. Visible and infrared video and ultraviolet flame luminescence imaging were used to evaluate flame length, diameter and structure. Radiometer measurements allowed determination of the radiant heat flux from the flame. The results show that flame length increases with total jet mass flow rate and jet nozzle diameter. When plotted as a function of Froude number, which measures the relative importance of jet momentum and buoyancy, the measured flame lengths for a range of operating conditions collapse onto the same curve. Good comparison with hydrocarbon jet flame lengths is found, demonstrating that the non-dimensional correlations are valid for a variety of fuel types. The radiative heat flux measurements for hydrogen flames show good agreement with non-dimensional correlations and scaling laws developed for a range of fuels and flame conditions. This result verifies that such correlations can be used to predict radiative heat flux from a wide variety of hydrogen flames and establishes a basis for predicting a priori the characteristics of flames resulting from accidental releases.