To study the occurrence conditions and propagation characteristics of deflagration to detonation transition (DDT) in linked vessels, two typical linked vessels were investigated in this study. The DDT of the methane–air mixture under different pipe lengths and inner diameters was studied. Results showed that the CJ detonation pressure of the methane–air mixture was 1.86 MPa, and the CJ detonation velocity was 1987.4 m/s. Compared with a single pipe, the induced distance of DDT is relatively short in the linked vessels. With the increase in pipeline length, DDT is more likely to occur. Under the same pipe diameter, the DDT induction distance in the vessel–pipe–vessel structure is shorter than that in the vessel–pipe structure. With the increase in pipeline diameter, the length of the pipe required to form the DDT is reduced. For linked vessels in which detonation formed, four stages, namely, slow combustion, deflagration, deflagration to detonation, and stable detonation, occurred in the vessels. Moreover, for a pipe diameter of 60 mm and a length of 8 m, overdriven detonation occurred in the vessel–pipe–vessel structure.

为研究连接容器中爆燃到爆轰转变（DDT）的发生条件和传播特性，本研究对两种典型的连接容器进行了研究。研究了不同管道长度和内径下甲烷-空气混合物的滴滴涕。结果表明，甲烷-空气混合物的CJ爆轰压力为1.86 MPa，CJ爆速为1987.4 m/s。与单管相比，DDT 在相连容器中的诱导距离相对较短。随着管道长度的增加，更容易发生DDT。在相同管径下，管-管-管结构的DDT感应距离短于管-管结构。随着管道直径的增加，形成滴滴涕所需的管道长度减少。对于形成爆震的连接容器，容器内发生了缓慢燃烧、爆燃、爆燃到爆震和稳定爆震四个阶段。此外，对于直径为 60 mm 和长度为 8 m 的管子，在容器-管-容器结构中发生了超速爆轰。