Volume 42 Issue 12
Dec.  2022
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YU Jianliang, ZHAN Xiaobing, LYU Xianshu, HOU Yujie, YAN Xingqing, YU Xiaozhe. Propagation characteristics of hydrogen-air detonation in bifurcated tubes with different angles[J]. Explosion And Shock Waves, 2022, 42(12): 125401. doi: 10.11883/bzycj-2022-0100
Citation: YU Jianliang, ZHAN Xiaobing, LYU Xianshu, HOU Yujie, YAN Xingqing, YU Xiaozhe. Propagation characteristics of hydrogen-air detonation in bifurcated tubes with different angles[J]. Explosion And Shock Waves, 2022, 42(12): 125401. doi: 10.11883/bzycj-2022-0100

Propagation characteristics of hydrogen-air detonation in bifurcated tubes with different angles

doi: 10.11883/bzycj-2022-0100
  • Received Date: 2022-03-17
  • Rev Recd Date: 2022-08-07
  • Available Online: 2022-10-25
  • Publish Date: 2022-12-08
  • Study on propagation characteristics of detonation in bifurcated tubes is of great significance to the safety protection of gas explosion in pipelines and engineering application. The propagation states of detonation vary with the geometrical structure when passing through the bifurcated tee. Based on the detonation circular test tube, the stoichiometric hydrogen-air mixture gas with 29.5% H2 in the volume fraction under different initial pressures was ignited by a 10-kV double high-voltage electrode to be detonated before entering the 30°, 45° and 90° bifurcation tees, respectively. The propagation characteristics of the detonation in the bifurcated tubes were analyzed based on the propagation velocity and cellular structure evolution characteristics obtained from the feedback signals of flame sensors and smoke-foils records. The results show that the H2/air detonation will decay when it passes through a bifurcated tee which is affected by rarefaction wave, but it is only a local phenomenon. The detonation re-initiation is gradually completed from regular reflection to Mach reflection after collision of incident shock wave and wall. In the straight branch tube, the detonation decay is mainly affected by the inlet area of the collateral branch tube. With the increase of the bifurcation angle, the inlet area decreases, and the detonation decay and re-initiation distance decrease as well. In the collateral branch tube, the detonation decay is affected by both the inlet area of the collateral branch tube and the gradual expansion of the section. When the bifurcated angle exceeds the critical value, the inlet area becomes the main influence factor. In addition, it is proved that increasing the experimental initial pressure of premixed gas can significantly improve the detonation stability and weaken the influence of bifurcation geometry. The mechanism of detonation decay and re-initiation in the bifurcated tubes is clarified by this study, which enriches the study of detonation diffraction and contributes to provide a scientific reference for engineering application and taking proper measures of explosion safety protection of gas pipelines as well.
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