The influence of screen mesh interception device on hydrogen-oxygen explosion in closed detonation tube

Hydrogen-oxygen mixture gas is a green explosive source, which is commonly used in the preparation of nanomaterials by gaseous detonation method. However, the growth mechanism of nanomaterials restricts the application of hydrogen-oxygen detonation controlled preparing nanomaterials. Detonation interception is an effective method to study the growth mechanism of nanomaterials. In order to study the influence of screen mesh interception device on the detonation wave propagation and nanoparticles interception efficiency, the variation characteristics of detonation velocity, velocity loss ratio (VLR), and re-ignition distance for 15 different screen mesh styles were analyzed by numerical simulation method. The results show that the wire diameter and pore size of the screen mesh would alter the blockage ratio (BR) and significantly affect the characteristics of the hydrogen-oxygen explosion. Under the same wire diameter, the VLR of detonation wave decreases with the increase of the BR. The blockage-loss ratio (B-L = BR/VLR) was proposed as an indicator for optimizing the screen mesh interception devices. For a given BR, a higher B-L corresponds to a lesser effect on the propagation of explosion waves. When the wire diameter is 1 mm, the B-L initially decreases first and then increases as the BR increases; when the wire diameter is 2 mm and 3 mm, the B-L increases first and then decreases with increasing BR. The influence of screen mesh style on the B-L is obvious: the smaller wire diameters are preferred for lower BRs, while the larger wire diameters are necessary for higher BRs. With the increase of BR, the re-ignition distance usually shows a fluctuating change of first decreasing, then increasing and then decreasing. The optimal BR for mesh interception devices is between 40% and 48%, and the recommended designs include a mesh with a 2 mm wire diameter and a pore size of 2 mm or a 3 mm wire diameter and a pore size of 3 mm.