In order to better assess the hazards of explosion accidents, propane-air mixture deflagrations were conducted in a large-scale straight rectangular chamber (with a cross-section of 1.5 m × 1.5 m, length of 10 m, and total volume of 22.5 m³). The effect of initial volume, ignition position, and initial restraints on the explosion characteristics of the propane-air mixtures was investigated. The explosion overpressure, flame propagation, and flame speed were obtained and the computational fluid dynamics (CFD) software was used to simulate the flame-propagation process and field flow for auxiliary analysis. The hazards of large-scale propagation explosion under weak and strong constraints were evaluated and the different phases of flame propagation under weak and strong constraints were discriminated. Results indicate that the hazards caused by propane deflagration under weak constraint are mainly caused by flame spread. And the maximum overpressure under strong constraint appeared at the front part of the chamber under the large-scale condition, which is consistent with the previous small-scale test. Moreover, the simulations of flame structures under weak and strong constraint are in good agreement with experimental results, which furthers the understanding of large-scale propane deflagration under different initial conditions in large-scale spaces and provides basic data for three-dimensional CFD model improvement.

为了更好地评估爆炸事故的危害，丙烷-空气混合物爆燃是在大型直角矩形腔室内进行的（横截面为1.5 m×1.5 m，长度为10 m，总容积为22.5 m ³）。研究了初始体积，点火位置和初始约束条件对丙烷-空气混合物爆炸特性的影响。获得了爆炸超压，火焰传播和火焰速度，并使用计算流体力学（CFD）软件来模拟火焰传播过程和场流，以进行辅助分析。评估了在弱约束和强约束条件下大规模传播爆炸的危害，并区分了在弱约束和强约束条件下火焰传播的不同阶段。结果表明，在弱约束下丙烷爆燃造成的危害主要是火焰蔓延引起的。在大规模条件下，强约束条件下的最大超压出现在腔室的前部，这与以前的小规模测试是一致的。此外，在弱约束和强约束下的火焰结构仿真与实验结果吻合良好，这进一步了解了在大空间内不同初始条件下大规模丙烷爆燃的现象，为三维CFD模型的改进提供了基础数据。 。