Detonation propagation, re-initiation, and flame propagation in acetylene–air mixtures were investigated in a channel with a transverse dimension that is comparable with the width of the detonation cell. Experiments were carried out in a channel with a square cross-section of 5 mm \(\times \) 5 mm. The detonation wave passed from the driver section into the transparent test section. The trajectories of the propagation of glowing combustion products (high-speed image sequences) were recorded, and high-speed schlieren image sequences of the reaction zone and shock waves were obtained. The flame front velocity was measured. The intensity of the shock waves was measured with piezoelectric pressure transducers. Depending on the equivalence ratio ER, four modes of combustion propagation were detected: (1) steady detonation; (2) decay and re-initiation of detonation; (3) detonation decay and flame acceleration; and (4) detonation decay and the absence of flame acceleration. Quantitative evaluation of the boundary layer thickness was carried out. The intensity of the shock wave and the flame front velocity were analysed for different modes. It was shown that the re-initiation of detonation in a mixture of acetylene and air with \(\text {ER} = 1.6\) is characterized by a spatial interval of \(1000\pm 50\) mm and a time interval of \(1300\pm 100~\upmu \hbox {s}\).

乙炔-空气混合物中的爆轰传播，重新初始化和火焰传播在通道中进行了研究，该通道的横向尺寸与爆轰单元的宽度相当。实验是在方形横截面为5毫米\（\ times \）的通道中进行的  5毫米 爆炸波从驱动器部分传递到透明测试部分。记录发光燃烧产物（高速图像序列）的传播轨迹，并获得反应区和冲击波的高速席勒图像序列。测量了火焰前沿速度。用压电压力传感器测量冲击波的强度。根据当量比ER，检测到四种燃烧传播模式：（1）稳定起爆；（2）衰减并重新起爆；（3）爆炸衰减和火焰加速；（4）爆炸衰减和没有火焰加速。进行边界层厚度的定量评估。分析了不同模式下的冲击波强度和火焰前沿速度。\（\ text {ER} = 1.6 \）的特征是\（1000 \ pm 50 \）  mm的空间间隔和\（1300 \ pm 100〜\ upmu \ hbox {s} \）的时间间隔。