This paper examines the flame dynamics of vented deflagration in stratified hydrogen layers. It also compares the measured combustion pressure transients with 3D GOTHIC simulations to assess GOTHIC's capability to simulate the associated phenomena. The experiments were performed in the Large-Scale Vented Combustion Test Facility at the Canadian Nuclear Laboratories. The stratified layer was formed by injecting hydrogen at a high elevation at a constant flow rate. The dominant parameters for vented deflagrations in stratified layers were investigated. The experimental results show that significant overpressures are generated in stratified hydrogen–air mixtures with local high concentration even though the volume-averaged hydrogen concentration is non-flammable. The GOTHIC predictions capture the overall pressure dynamics of combustion very well, but the peak overpressures are consistently over-predicted, particularly with higher maximum hydrogen concentrations. The measured combustion overpressures are also compared with Molkov's model prediction based on a layer-averaged hydrogen concentration.

本文研究了分层氢层中泄燃爆燃的火焰动力学。它还将测得的燃烧压力瞬变与3D GOTHIC仿真进行比较，以评估GOTHIC仿真相关现象的能力。实验是在加拿大核实验室的大型通风燃烧试验设施中进行的。分层层是通过以恒定流速高高度注入氢而形成的。研究了分层中通风爆燃的主要参数。实验结果表明，即使体积平均氢浓度不可燃，在局部高浓度的分层氢-空气混合物中也会产生明显的超压。GOTHIC的预测很好地反映了燃烧的总体压力动态，但峰值超压始终被高估，尤其是在最大氢浓度更高的情况下。还将测得的燃烧超压与基于层平均氢浓度的Molkov模型预测进行比较。