Effects of argon dilution on detonation diffraction in branch tube

With a third-order upwind TVD and Strang-splitting operator splitting method, two-dimensional numerical calculations of detonation combustion with the mixture of H₂/O₂/Ar was carried out, in order to study the effects of diluted gases Ar on the propagation of detonation from the straight tube to the branch tube and in the straight tube. The results show that under the four component ratios at 298K, 6670Pa initial conditions, the downstream of main detonation tube will produce different degrees of decoupling because of the effects of rarefaction wave, but plane detonation will regain through the wall Mach reflection. When the volume ratio of H₂/O₂/Ar is 2:1:7, the detonation wave is diffracted into the branch tube and decoupled into deflagration flame wave. Under the conditions of volume ratio of 2:1:0, 2:1:0 and 2:1:1, the detonation wave of level tube is diffracted into the vertical tube, self-sustaining detonation wave will be regained from decoupling detonation wave to the secondary ignition by the several times of wall Mach reflection.