Experimental Study on the Self-ignition of Pressurized Hydrogen Released into Three-way Tubes

To explore the effect of bifurcation structures on the spontaneous ignition and shock wave result from the sudden release of pressurized hydrogen. Three-way tubes with different bifurcation angles (90°, 120°, 150°) were used in the experiments. They are two Y-shape tubes and one T-shape tube. The photoelectric and pressure signals in the tube were recorded by the sensor. The results show that the reflected shock wave will be formed at the bifurcation. In addition, the intensity and velocity of the leading shock wave will attenuate sharply when it passes through the bifurcation.The smaller bifurcation angle of tube,the smaller overpressure decay rate of shock wave at bifurcation position.The smaller the bifurcation angle of tubes, the weaker the reflected shock wave transmitted downstream, and the greater attenuation of shock wave intensity. Experimental results have reference value for the safety of hydrogen storage at high-pressure, and are helpful to understand the influence of different tube structures on spontaneous ignition when hydrogen is transported at high pressure.