Effects of inert gas jet on the transition from deflagration to detonation in a stoichiometric methane-oxygen mixture

Cheng, Jun; Zhang, Bo; Ng, Hoi Dick; Liu, Hong; Wang, Fuxing

doi:10.1016/j.fuel.2020.119237

Cited by 28 publications

(4 citation statements)

References 44 publications

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“…3(b-d), introducing vast mushroom vortices and turbulent perturbances. These are also confirmed by prior studies in FA triggered by transverse jets [11,27,28]. Although the surface area of the propagating flame is elongated dramatically owing to the intense turbulence, low temperature of the combustion products (see rectangle A) is formed as the detrimental mixing uniformity appears in the downstream tube, as revealed by Fig.…”

Section: Flame Acceleration and Ddtsupporting

confidence: 85%

Detonation simulations in supersonic flow under circumstances of injection and mixing

Zhao

Deiterding

Liang

et al. 2023

Proceedings of the Combustion Institute

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Section: Flame Acceleration and Ddtsupporting

confidence: 85%

Detonation simulations in supersonic flow under circumstances of injection and mixing

Zhao

Deiterding

Liang

et al. 2023

Proceedings of the Combustion Institute

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“…8(g2)]. Recent works 16,76 have conducted detailed research of the transverse jet on the DDT process in a smooth channel, and the results demonstrated that there are a lot of mushroom vortices in the jet exit downstream, but no significant K-H instabilities can be formed in the downstream tube.…”

Section: B the Mechanisms Of Flame Acceleration In Combined Obstaclesmentioning

confidence: 99%

Flame–turbulence interactions during flame acceleration using solid and fluid obstacles

et al. 2022

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A combination of solid and transverse jet obstacles is proposed to trigger flame acceleration and deflagration-to-detonation transition (DDT). A numerical study of this approach is performed by solving the reactive Navier-Stokes equations deploying an adaptive mesh refinement technique. A detailed hydrogen-air reaction mechanism with 12 species and 42 steps is employed. The efficiency and mechanisms of the combined obstacles on the flame acceleration are investigated comprehensively. The effects of multiple jets, jet start time, and jet stagnation pressure on the DDT process are studied. Results show that there is a 22.26% improvement in the DDT run-up time and a 33.36% reduction in the DDT run-up distance for the combined obstacles compared to that having only solid obstacles. The jet acts as an obstruction by producing a suitable blockage ratio and introducing an intense turbulent region due to the Kelvin-Helmholtz instability. This leads to dramatic flame-turbulence interactions, increasing the flame surface area dramatically. The dual jet produces mushroom-like vortices, leading to a significantly stretched flame front and intensive Kelvin-Helmholtz instabilities, and therefore these features produce a high flame acceleration. As the jet operation time decreases, the jet obstacle almost changes its role from both physical blockage ratio as well as turbulence and vorticity generator to a physical blockage ratio. There is a moderate jet stagnation pressure that reduces the run-up time to detonation and run-up distance to detonation in the obstacle-laden chamber. While further increasing the jet stagnation pressure, it does not have a positive effect on shortening the detonation transition.

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“…Morrison et al [6] carried out a one-dimensional theoretical evaluation and scheme design of the performance of the ODE machine. Compared with traditional scramjet, it has the advantages of high efficiency of the heat cycle, simple structure, reliability, and wide working scope [7][8][9][10]. In the process of ODE practice, the reliable initiation and standing of ODW in the combustor is the primary problem, so it is necessary to study the initiation characteristics and mechanism 2 of 16 of the ODW.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Accelerated Initiation of Oblique Detonation Wave Induced by Laser-Heating Hot-Spot

Xin,

Shang,

Xiang

et al. 2024

Aerospace

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A reliable initiation of oblique detonation is critical in oblique detonation engines, especially for oblique detonation engines under extreme conditions such as a high altitude and low Mach number, which may lead to excessive length of the induction zone and even the phenomenon of extinction. In this paper, surface ignition was applied to the initiation of oblique detonation, and a high-temperature region was set on the wedge to simulate the presence of a hot-spot induced by the laser heating. The two-dimensional multi-component Navier–Stokes equations considering a detailed H2 combustion mechanism are solved, and the oblique detonation wave accelerated by a hot-spot is studied. In this paper, hot-spots in the induction zone on the wedge, are introduced to explore the possibility of hot-spot initiation, providing a potential method for initiation control. Results show that these methods can effectively promote the accelerated initiation of the oblique detonation. Furthermore, the hot-spot temperature, size and position are varied to analyze their effects on the initiation position. Increasing the temperature and size of the hot-spot both can accelerate initiation, but from the perspective of energy consumption, a small hot-spot at a high temperature is preferable for accelerating ODW initiation than a large hot-spot at a low temperature. The initiated position of the oblique detonation is sensitive to the position of the hot-spots; if a 2000 K hotspot is at the beginning of the wedge, then the ODW’s initiation distance will be reduced to about 30% of that without hotspot acceleration.

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Effects of inert gas jet on the transition from deflagration to detonation in a stoichiometric methane-oxygen mixture

Cited by 28 publications

References 44 publications

Detonation simulations in supersonic flow under circumstances of injection and mixing

Detonation simulations in supersonic flow under circumstances of injection and mixing

Flame–turbulence interactions during flame acceleration using solid and fluid obstacles

Investigation on Accelerated Initiation of Oblique Detonation Wave Induced by Laser-Heating Hot-Spot

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