Initiation and propagation of detonation waves in combustible high speed flows

Ishii, Kotaro; Kataoka, Hidefumi; Kojima, Takashi

doi:10.1016/j.proci.2008.05.029

Cited by 43 publications

(11 citation statements)

References 8 publications

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“…In the Y direction after the reflections on the side walls the two triple 17 lines both change the propagating direction, as is shown in Fig.15(c). In Fig.14(d), the two triple lines in the Y direction are getting close to each other and prepare for a new collision while in the Z direction after the collision the two triple lines are also propagating to each other, which are simplified in Fig.15(d).…”

Section: Cj Detonationmentioning

confidence: 70%

“…Researches on detonation initiation with a hot jet have been numerously investigated [11][12][13][14][15][16] , but most of them are carried out only in quiescent combustible mixtures. Detonation initiation and propagation using a hot jet were conducted experimentally by Ishii et al [17] , where the Mach numbers of combustible mixtures were 0.9 and 1.2. Detonation initiation and deflagration to detonation transition (DDT) were investigated experimentally using a hot jet by Han et al [18] [19] in supersonic combustible mixtures, where detonations were directly initiated through shock or shock reflection [20][21][22][23] induced by the hot jet.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Cai

Liang

Deiterding

et al. 2016

International Journal of Hydrogen Energy

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Although the overdrive degree of the 3D detonation is smaller than that of the 2D case, more complex and irregular detonation fronts can be observed in the 3D case compared with the 2D detonation, which is likely because of the propagation of transverse waves and collisions of triple lines in multi-directions in 3D detonations. After the hot jet is shut down, the newly formed 2D Chapman-Jouguet (CJ) detonation has almost the same characteristic parameters with the corresponding 3D case, indicating that the 2D instabilities can be perfectly preserved in 3D simulations. However, the slapping wave reflections on the side walls in the 3D detonation result in the second oscillation along with the main one, which presents stronger instabilities compared with the 2D case. The inherent stronger 3D instabilities is also verified through the quantitative comparison between the 2D and 3D cases where the 3D result always shows stronger fluctuations than the 2D case.

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Section: Cj Detonationmentioning

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Cai

Liang

Deiterding

et al. 2016

International Journal of Hydrogen Energy

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show abstract

“…The TOF method appears to be suitable for strong, distinct transient signals such as shock and detonation waves. [4][5][6] In situations where the signal is weak, the TOF method requires further treatment or may even have to be replaced by more powerful methods.…”

Section: CCCmentioning

confidence: 99%

Detection of Wave Propagation by Nonstationary Cross-Correlation and Cross-Spectral Density Phase

Ortiz

Lu²

2009

39th AIAA Fluid Dynamics Conference

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The accurate determination of the speed of a propagating disturbance is important for a number of applications. A nonstationary cross-spectral density phase (NCSDP) technique was developed to provide a statistical estimate of the propagation time of sharp discontinuities such as steps or spikes that model shock or detonation waves. The uncertainty of the phase estimate is dependent on the coherence between the signals. For discrete implementation of the NCSDP technique, a "weighted-resetting-unwrap" of the phase angle was proposed to discard values of the coherence below a threshold value, that is, only the unwrapped phase angle above the threshold was accepted. In addition, an envelop function was used which improved the technique. The technique was found to be unsuitable for step disturbances but was more effective in estimating the time delay with a small standard deviation if the sharp disturbance also showed a rapid decay.

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“…Hot jet initiation has been investigated numerously (Medvedev et al, 2005;Liu et al, 2012;Iglesias et al, 2012); yet, only a few studies have been carried out in supersonic combustible mixtures. Ishii et al (Ishii et al, 2009) investigated experimentally detonation initiation and propagation using a hot jet in high-speed combustible flows where the Mach numbers are 0.9 and 1.2. Han et al (Han et al, 2012;Han et al, 2013) conducted experiments of detonation initiation and deflagration to detonation transition (DDT) using a hot jet in supersonic combustible mixtures with the Mach number above 4.0, and detonations A c c e p t e d M a n u s c r i p t 3 were initiated exactly through shocks or shock reflections (Gamezo et al, 2008;Jackson and Shepherd, 2008;Gavilanes et al, 2011;Gavilanes et al, 2013;Chaumeix et al, 2014;Liu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Detonation Control Using a Pulse Hot Jet in Supersonic Combustible Mixture

Cai

Liang

Deiterding

2016

Combustion Science and Technology

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Abstract:To investigate the mechanism of detonation control using a pulse hot jet in the supersonic hydrogen-oxygen mixture, high-resolution simulations with a detailed reaction model were conducted using an adaptive mesh refinement method. After the successful detonation initiation, a contractive passway was generated between the hot jet and the main flow field behind the detonation front. Due to the contractive passway, the expansion of detonation products was prevented, hence resulting in overdriven detonation. By setting up various contractive passways through adjusting the width of the hot jet, the overdrive degree of overdriven detonation also changes. It is suggested that the width of the hot jet has approximately linear relation with the relative and absolute propagation velocities. When the contractive passway gradually disappeared after the shutdown of the hot jet, overdriven detonation attenuated to the dynamically stable Chapman-Jouguet (CJ) detonation. When the contractive passway was re-established once again after the re-injection of the hot jet, the CJ detonation developed to the same overdriven detonation, indicating that the contractive passway controlled by the pulse hot jet can indeed control detonation propagation in the A c c e p t e d M a n u s c r i p t 2 supersonic combustible mixture to some extent.

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Initiation and propagation of detonation waves in combustible high speed flows

Cited by 43 publications

References 8 publications

Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Adaptive mesh refinement based simulations of three-dimensional detonation combustion in supersonic combustible mixtures with a detailed reaction model

Detection of Wave Propagation by Nonstationary Cross-Correlation and Cross-Spectral Density Phase

Numerical Investigation on Detonation Control Using a Pulse Hot Jet in Supersonic Combustible Mixture

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