The present study reports the detonation behaviors of syngas-oxygen mixtures in three 2 m long tubes, including two circular tubes ($D$ = 32 mm and 18.5 mm, $D$ is the inner diameter) and a square tube ($H$ = 32 mm, $H$is the inner side). Three stoichiometric syngas-oxygen mixtures, i.e., CO+H₂+O₂, 2CO+H₂+1.5O₂, 3CO+H₂+2O₂ were used. Evenly spaced photodiodes were used to determine the detonation velocity while the soot foil technique was adopted to record the cellular structure. The results indicate that well with the limits, the detonation propagates at a steady velocity close to the Chapman-Jouguet value. The velocity deficits are more prominent at decreased initial pressure (equivalently, larger cell size and less sensitivity). At the limiting pressure, the velocity deficits of three mixtures in various tubes are approximate 14%–17%. The experimental velocity deficits were compared with a modified model based on Fay's theory, in which the cell size as well as the corresponding cell length are measured. The experimental velocity deficit is in excellent agreement with the theoretical prediction. The effective diameter, $D_e$, rather than the hydraulic diameter, is found to be a more appropriate parameter for the characterization of the detonation velocity in both round and square tubes. Further, a linear correlation between the normalized detonation velocity and ${(D_e·p_0)}^{-1}$ is observed. The cellular structure shows that the single-headed spin occurs in all tubes when the detonation limits are approached.

本研究报告了在3个2 m长的试管中的合成气-氧气混合物的爆炸行为，其中包括2个圆形试管（$d$ = 32毫米和18.5毫米， $d$ 是内径）和一个方管（$H$ = 32毫米， $H$是内侧）。三化学计量的合成气-氧气混合物，即，CO + H ₂ + O ₂，2CO +ħ ₂ + 1.5O ₂，3CO + H ₂ + 2O ₂被使用。使用均匀间隔的光电二极管确定爆轰速度，同时采用烟灰箔技术记录细胞结构。结果表明，在极限条件下，爆轰以接近Chapman-Jouguet值的稳定速度传播。速度缺陷在初始压力​​降低时更为明显（等效地，较大的细胞大小和较低的灵敏度）。在极限压力下，各种管中三种混合物的速度不足约为14％–17％。将实验速度缺陷与基于Fay理论的改进模型进行了比较，其中测量了细胞大小以及相应的细胞长度。实验速度不足与理论预测非常吻合。有效直径$d_{Ë}$而不是水力直径，被发现是表征圆管和方管中爆轰速度的更合适的参数。此外，归一化爆震速度与${（d_{Ë}·p_0）}^{-\mathrm{1个}}$被观察到。细胞结构表明，当接近爆轰极限时，所有管中都发生单头旋转。