Experimental research on the Characteristics of Hydrogen-Air Explosion Pressure in Spherical Vessel-Pipe

In this paper, the spherical vessel-pipe gas explosion test system is developed to study the effects of initial pressure, vessel volume and pipe length on the explosion of hydrogen-air premixed gas. The experimental system consists of an explosive device, an ignition device, a data acquisition device and an automatic gas distribution device. The explosive device consists of a 113 L or 22 L spherical vessel connected with pipe. The experimental results showed that, the maximum explosion pressure in the spherical vessel connected with pipe decreases with pipe length, the hydrogen maximum explosion pressure at the end of the pipe decreased when the spherical vessel is connected. The maximum explosion pressure in the isolated spherical vessel and the isolated pipe terminal increased linearly with the initial pressure. In the spherical vessel connected with pipe, the maximum explosion pressure in the spherical vessel and pipe terminal increased with the initial pressure, but there is no linear relationship between the maximum explosion pressure and the initial pressure. In the spherical vessel connected with pipe, the change in maximum explosion pressure in the spherical vessel is small, and the maximum explosion pressure at the pipe terminal clearly increased as the volume of the vessel increased. When a hydrogen explosion occurs in the spherical vessel connected with pipe, there is a significant oscillation in the spherical vessel and terminal of the pipe. The maximum explosion pressure rising rate in spherical vessel increases with the vessel volume, The maximum explosion pressure rise rate at the pipe terminal decreases with the vessel volume. The maximum hydrogen explosion pressure rising rate at the pipe terminal increases with the pipe length, the maximum hydrogen explosion pressure rising rate in the large spherical vessel decreases with the pipe length. In the spherical vessel connected with pipe, the maximum explosion pressure in the spherical vessel decreases with the pipe length. The maximum hydrogen explosion pressure in the pipe terminal increased with the pipe length. When the spherical vessel is connected with the three-section pipe, the maximum hydrogen explosion pressure in the pipe terminal reaches 1.78 MPa, which is a quasi-detonation state.