Effects of a Vortex Flow on Characteristics of Deflagration-to-Detonation Transition

Abstract

The effects of a vortex flow (VF) on the characteristics of deflagration-to-detonation transition (DDT) were examined in order to achieve the shortest distance of DDT for a pulse detonation engine (PDE). The DDT distances in a vortex flow were shortened by 15-47 % than those in a counterflow. The shortening effect becomes remarkable as the rotating velocity increases. Formation of the area of higher energy density in the ignition domain of the tube, and flame acceleration due to rapid flame propagation in the vortex flow and promotion of turbulence near the tube wall by the rotating velocity in the transition domain of the tube are considered to be the governing factors in shortening the DDT distance.