Application of a laser induced fluorescence model to the numerical simulation of detonation waves in hydrogen–oxygen–diluent mixtures

Mével, Rémy; Davidenko, Dmitry; Austin, Joanna; Pintgen, F.; Shepherd, Joseph E.

doi:10.1016/j.ijhydene.2014.01.182

Cited by 42 publications

(21 citation statements)

References 61 publications

(58 reference statements)

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“…The achieved UV energy per pulse was of 0.5±0.05 mJ and the obtained laser sheet was circa 0.5 mm thick. The images were captured with a frame rate of 2000 fps for 1.5s, and the pixel intensity was corrected with an exponential function that accounts for the progressive light absorption by the OH radicals through the laser sheet path [10]. The resulting images are presented in fig.…”

Section: Thermoacoustics Under Stationary Conditionsmentioning

confidence: 99%

Effect of wall thermal inertia upon transient thermoacoustic dynamics of a swirl-stabilized flame

Bonciolini¹,

Ebi²,

Doll³

et al. 2019

Proceedings of the Combustion Institute

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This paper shows the importance of considering the thermal state of a combustor to investigate or predict its thermoacoustic stability. This aspect is often neglected or regarded as less important than the effect of the operating parameters, such as thermal power or equivalence ratio, but under certain circumstances it can have a dramatic influence on the development of the instabilities. The paper presents experimental results collected from a combustor featuring a lean swirl-stabilized flame exhibiting thermoacoustic instability at some operating conditions. It is shown that this instability is caused by a change of the flame topology that is induced by the progressive increase of the wall temperature with the thermal power. This dependence of the instability on wall temperature leads to inertial effects and hysteresis when the operating condition is changed dynamically. A low-order model of the system reproducing this remarkable dynamics is proposed and validated against the experimental data.

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Section: Thermoacoustics Under Stationary Conditionsmentioning

confidence: 99%

Effect of wall thermal inertia upon transient thermoacoustic dynamics of a swirl-stabilized flame

Bonciolini¹,

Ebi²,

Doll³

et al. 2019

Proceedings of the Combustion Institute

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“…Numerical simulations [48] and experimental observations [49][50][51] show that there are generally two types of detonation structures. According to the cellular structure regularity, they are usually classified as regular (weakly unstable) and irregular (unstable) structure [52][53][54][55][56][57][58][59] .…”

Section: Calculation Modelmentioning

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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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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“…A cavity is located downstream in the hot jet. Numerical simulations and experimental observations [41][42][43][44] indicate the existence of two types of detonation structures which are usually classified as regular (weakly unstable) and irregular (highly unstable) detonations based on the regularity of cellular structure [45][46][47][48][49][50][51][52] . Self-sustaining CJ (Chapman-Jouguet) detonations for hydrogen-oxygen mixtures highly diluted with argon in low pressure are ideal candidates for detonation simulations, because very regular cellular detonations can be generated [53] , which are relatively beneficial for investigations of cavity-based detonations.…”

Section: Computational Setupmentioning

confidence: 99%

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

Cai

Liang

Deiterding

et al. 2016

International Journal of Hydrogen Energy

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Two-dimensional reactive Euler equations with a detailed reaction modelwhere the molar ratio of the combustible mixture H2/O2/Ar is 2:1:7 under the condition of pressure 6.67 kPa and temperature 298 K, are solved numerically with adaptive mesh refinement method to investigate detonation combustion using a hot jet initiation in cavity-based channels filled with the supersonic combustible mixture.Results show that from the comparison between the simulations in a cavity-based channel and a straight channel without any cavity embedded, it is indicated that the cavity can help realize detonation initiation in the combustible mixture with a hot jet.It is suggested that detonation initiation can be realized using a relatively weaker hot jet in cavity-based channels filled with the supersonic combustible mixture compared with that in straight channels without a cavity embedded. The cavity also plays a significant role in detonation propagation in the supersonic combustible mixture.After the hot jet is shut down, the acoustic wave generated by the subsonic combustion in the cavity can accelerate detonation propagation through a subsonic Corresponding author. Email addresses: cai-chonger@hotmail.com, jhleon@vip.sina.com, r.deiterding@soton.ac.uk, linzy96@nudt.edu.cn, channel and result in the formation of a slightly overdriven detonation eventually. For a given flow with a shadow cavity embedded, there should exist a minimum cavity width Lmin. When the width is below Lmin, only some pressure oscillations in the cavity can make some impacts on detonation initiation and propagation. Otherwise, cavity oscillations can be generated which can greatly accelerate detonation initiation and propagation in the supersonic combustible mixture. For the shadow cavity, purely increasing the cavity depth does not have any more influence on detonation combustion. However, if the cavity is a deep one, it can play an important role in accelerating detonation initiation and propagation in the supersonic combustible mixture due to resonant oscillations.

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Application of a laser induced fluorescence model to the numerical simulation of detonation waves in hydrogen–oxygen–diluent mixtures

Abstract: Published in the International J of Hydrogen Energy, Vol. 30, 6044-6060, 2014

Cited by 42 publications

References 61 publications

Effect of wall thermal inertia upon transient thermoacoustic dynamics of a swirl-stabilized flame

Effect of wall thermal inertia upon transient thermoacoustic dynamics of a swirl-stabilized flame

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

Adaptive simulations of cavity-based detonation in supersonic hydrogen–oxygen mixture

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