Flame propagation in hydrogen-air mixtures in a tube

The propagation of a hydrogen-air flame in a closed tube 76 mm in diameter and 2500 mm in length with and without a water film moving along the tube walls was studied experimentally and theoretically, it has been found that in a smooth-wall tube the maximum turbulization factor ranges between 10 and 30 for mixtures with the volume concentrations of hydrogen 15–30%. The presence of a moving water film on the tube walls intensifies the combustion process, which manifests itself in the essential acceleration of the detonation pressure rise. However, at the same time, the maximum explosion pressure for near-stoichiometric mixtures increases, while that for leaner compositions decreases. The results obtained are interpreted qualitatively.