Effects of disturbance on detonation initiation in H 2 / O 2 / N 2 mixture

摘要: Detonation initiation has been extensively investigated in the past several decades. In literature, there are many studies on detonation using a large amount of blast energy and obstacles to respectively achieve direct or deflagration transition (DDT). However, few with non-uniform zone. this work, two-dimensional numerical simulations considering detailed chemistry transport conducted investigate effects disturbance stoichiometric H2/O2/N2 mixture. The high-pressure high-temperature regime is imposed by sinusoidal disturbance. Introduction such found promote onset reduce time distance for formation. This mainly because can induce shock wave interaction, which generates transverse waves. reflected waves result local autoignition/explosion. coherent coupling between autoignition pressure resulting from heat release eventually leads development. It that duration become shorter when smaller wavelength larger amplitude enforced. When ratio fixed, change little influence initiation. Therefore, either small be used