A 3D numerical study of detonation wave propagation in various angled bending tubes. (November 2016) - Luo, C.
Abstract: This paper conducts a numerical study of detonation wave propagations in 30 m and 73 m long straight/varying angle bending detonation tubes with inner diameters of 0.5 m and 1.05 m, respectively, which are filled with varying stoichiometric methane-air mixtures. In the study a 3D numerical model was established by combining a compressible one-step global reaction hot model with the k-ω shear-stress transport (SST) turbulent model. In order to resolve the thin detonation wave front, a dynamically refined mesh near the high pressure gradient is adopted. The initial conditions of the model are obtained from the 1D detonation model. The present model was first verified by comparing the numerical results against the published measurements. The pressure distributions and detonation wave speeds across the tubes and bends were then predicted by using this 3D model. Graphical abstract: Highlights: The predicted detonation wave speed is consistent with the measurements. Higher pressure at the outer surface is caused by the reflection of the main shock wave colliding with the outer wall surface. The detonation wave speed does not change greatly after passing the detonation bending section. The planar detonation wave damage/restoration process after passing through the tube bend is divided into three stages