Fast gas combustion in systems with hydraulic resistance

Various aspects of the sonic velocity regime, one of the steady-state regimes of filtration combustion of gases, is analyzed. The conditions and region of existence of the regime, the velocity and structural characteristics of the combustion wave, the gas ignition and combustion mechanisms, conditions for the stabilization of the wave velocity, and regime transitions are considered. A characteristic feature of the regime is the presence of a pressure wave in the zone of turbulent flame due to the choking of channels and narrowings. The main factors determining the nature and properties of the sonic velocity regime are the hydraulic resistance, piezo diffusion, the energetics of the mixture, the compressibility and turbulence of the gas, and the reactivity of the mixture at high pressures and temperatures. The sonic velocity regime is a unique and intriguing combustion regime which is promising for applications.