Fluidic Flame Stabilization in a Planar Combustor Using a Transverse Slot Jet

Ahmed, Kareem A.; Forliti, David

doi:10.2514/1.35825

Cited by 20 publications

(3 citation statements)

References 20 publications

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“…The concept of jet obstacles has been proposed in conventional combustor recirculation zone design for ensuring combustion stability, where it leads to less total pressure loss compared to solid obstacles [10]. Inspired by this, the fluidic jet is applied as a substitute for a solid obstacle in the detonation chamber.…”

Section: Introductionmentioning

confidence: 99%

Effects of jet in crossflow on flame acceleration and deflagration to detonation transition in methane–oxygen mixture

Han

Huang

Deiterding

et al. 2018

Combustion and Flame

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The fluidal jet turbulator has been a novel perturbation generator in the pulse-detonation engines research field for the past few years. In this paper, an experiment is performed to study the deflagration to detonation transition (DDT) process in a detonation chamber with a reactive transverse methane-oxygen mixture jet in crossflow (JICF). The jet injection arrangement is fundamentally investigated, including single jet and various double jets patterns. Corresponding two-dimensional direct numerical simulations with a multistep chemical kinetics mechanism are employed for analyzing details in the flow field, and the interaction between the vortex and flame temporal evolution is characterized. Both the experiments and simulations demonstrate that the JICF can distinctly accelerate flame propagation and shorten the DDT time and distance. The vortex stream induced by the jet distorts and wrinkles the flame front resulting in local flame acceleration. Moreover, the double jet patterns enhance flame acceleration more than the single jet injection because of the intrinsic counterrotating vortex pairs and enhanced turbulence intensity.

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Section: Introductionmentioning

confidence: 99%

Effects of jet in crossflow on flame acceleration and deflagration to detonation transition in methane–oxygen mixture

Han

Huang

Deiterding

et al. 2018

Combustion and Flame

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“…However, these approaches face vast challenges in the form of propulsion loss when the mixture has a high flow velocity [6], especially for an air-breathing detonation engine [7]. Therefore in recent years the transverse jet obstacle has been introduced to trigger DDT [8,9], which is advantageous compared to the fixed obstructions as confirmed by many previous studies [10,11]. While in most previous studies, the mixture has typically been considered at a steady and uniform state.…”

Section: Introductionmentioning

confidence: 99%

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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“…2,38 To overcome the above shortcoming of the obstacle-laden chamber in the DDT process, the fluidic transverse jet approach is introduced, which provides a similar function as the solid obstacle and has lower pressure loss. 17,39 These fluidic crossflow jets have an advantage to be adjusted easily to form different turbulent flows and eddies by changing the jet width and stagnation pressure, which can efficiently control the DDT process. 40 Prior work on the effects of a transverse jet in crossflow on the DDT process was successfully produced by Knox et al 17,41 They demonstrated that the transverse jet acts as a physical obstruction and introduces a high level of turbulence within the chamber.…”

Section: Introductionmentioning

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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Fluidic Flame Stabilization in a Planar Combustor Using a Transverse Slot Jet

Cited by 20 publications

References 20 publications

Effects of jet in crossflow on flame acceleration and deflagration to detonation transition in methane–oxygen mixture

Effects of jet in crossflow on flame acceleration and deflagration to detonation transition in methane–oxygen mixture

Detonation simulations in supersonic flow under circumstances of injection and mixing

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

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