On detonation waves supported by diffusion flames.

An eigenvalue condition to determine propagation velocity of detonation waves in a tube is derived for the case where the oxidizer and fuel are in the gaseous and condensed phase, respectively, so that the combustion occurs only within the peripheral boundary layer. It is shown that the self-sustained shock propagation is possible if core streamtube constriction, due to combustion in the boundary layer, is strong enough to form a converging nozzle, and for a sonic throat to exist.