Effect of porous size on detonation wave attenuation of hydrogen-air mixture

This study numerically investigates the influence of hole geometry on the attenuation of detonation waves in porous tubes filled with stoichiometric hydrogen-air mixtures at initial conditions of 300 K and 1 atm. Cell structure analysis is employed to verify the suppression of transverse waves by the holes and, consequently, to evaluate resulting impact on the detonation wave. The numerical results are analyzed to identify patterns and extend the suppression laws through normalization. The results indicate that reducing the hole spacing increases the average cell size within the porous section, thereby simultaneously enhancing the suppression of both transverse and detonation waves. A strong correlation is observed between hole depth and width, wherein an increase in either parameter leads to a larger cell size. However, when one dimension significantly exceeds the other, the cell size decreases from its peak value. Nevertheless, within the investigated range, the cell size remains larger than that observed in a straight tube. The study demonstrates that, within the investigated range, the most effective suppression of the detonation wave is achieved by maintaining equal hole depth and width, while concurrently reducing the hole spacing and increasing both the depth and width. The findings provide engineering guidance for the safety design of hydrogen energy facilities.