Progress in Modeling Pulsed Detonations

Lu, Frank K.; Bellini, Rafaela

doi:10.1142/9789812837851_0003

Cited by 1 publication

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“…The understanding of the DDT process is therefore important for implementation and control of the detonation. In recent years, much interest has been focused on this phenomenon because of the direct potential application in the pulse detonation engines 1,2 . On the other hand, it is also useful in disaster prevention and loss prediction 3 .…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Deflagration to Detonation Transition in a Straight Duct: Effect of Energy Release

Dou

Khoo

2012

Int. J. Mod. Phys. Conf. Ser.

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Numerical simulation based on the Euler equation and one-step reaction model is carried out to investigate the process of deflagration to detonation transition (DDT) occurring in a straight duct. The numerical method used includes a high resolution fifth-order weighted essentially nonoscillatory scheme for spatial discretization, coupled with a third order total variation diminishing Runge-Kutta time stepping method. In particular, effect of energy release on the DDT process is studied. The model parameters used are the heat release at q =50, 30, 25, 20, 15, 10 and 5, the specific heat ratio at 1.2, and the activation temperature at Ti =15, respectively. For all the cases, the initial energy in the spark is about the same compared to the detonation energy at the Chapman-Jouguet (CJ) state. It is found from the simulation that the DDT occurrence strongly depends on the magnitude of the energy release. The run-up distance of DDT occurrence decreases with the increase of the energy release for q =50~20, and increases with the increase of the energy release for q =50~20. It is concluded from the simulations that the interaction of the shock wave and the flame front is the main reason for leading to DDT.

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Section: Introductionmentioning

confidence: 99%