Effects of a jet turbulator upon flame acceleration in a detonation tube

Zhao, Shilong; Fan, Yuxin; Lv, Haojie; Jia, Bingyue

doi:10.1016/j.applthermaleng.2016.12.068

Cited by 18 publications

(9 citation statements)

References 6 publications

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“…Whereas in another study, the jet made by pure air deteriorates the local kerosene-air ratio and fuel distribution, which was observed experimentally and found to be disadvantageous for flame propagation. On the other hand, a jet made by a kerosene-air mixture can effectively accelerate the flamepropagation [13]. Apart from that, the experiments, methane-air flame acceleration in duct with JICF, demonstrate that the jet is more effective at transitioning the laminar flame to a fast-propagating turbulent flame than the solid object according to PIV and Schlieren imaging results [14].…”

Section: Introductionmentioning

confidence: 93%

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: 93%

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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“…[23], in which Kumar and Sahu [23] experimentally studied the impact of the geometry of coaxial injectors of jet fluids, widely used in rocket engines to mix fuel with oxidants, in other important factors of the process, such as the average length of jet separation (mean jet breakup length) and primary jet instabilities, attributed to the separation of airflow highlight considerations to be analyzed in the possibility of using injectors as obstacles in order to generate turbulence. Thus, in the analysis of Zhao et al [17], the insertion of jets in a detonation tube led, both in the air-only jets, and in those that expelled a mixture of air with kerosene, to periodic vortexes in the flow, causing turbulence within the detonation tube, and the mixture jets obtained a higher intensity of turbulence.…”

Section: Flowmentioning

confidence: 99%

“…Disturbances in the flow can also be generated by inserting angled flows in relation to the main axis of the flow [17]. Since such elements are usually subjected to severe temperature and pressure conditions, as well as cyclic loading, which can lead to fatigue failure, it is recommended to use materials with high fatigue resistance, which have a high melting point and are tenacious [18,19].…”

Section: Introductionmentioning

confidence: 99%

Bibliographic Review: The Influence of Obstacles Inside the Ducts on the Flow Proprieties

Caetano¹,

Pozzebon²,

França³

et al. 2022

MMEP

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This work aims to evaluate the possibility of adding obstacles to ducts with isothermal flows and their effects on the performance of the flowfield. This literature review was performed based on several articles exploring obstacles and their geometries inside ducts and chambers or channels and analyzing the obstacle distribution in a nozzle. The main utility of the obstacle is in the pipes and boilers of the metal-mechanical and petrochemical industry. In these industries, results are mostly positive since the obstacles allow manipulating the temperature inside channels and on their walls. Besides, they are correlated to increasing the acceleration of the exhaust gases and turbulence of the flow. In addition, an optimal preliminary nozzle geometry was found for applications in the aerospace industry. However, this information is useful for other applications. Thus, the possible use of obstacles in cases where the combustion reactions are considered seems promising, indicating an excellent opportunity to further research this topic in more specific areas.

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“…Experiments about the fluidic obstacle made by pure air and kerosene-air were carried out to investigate the effect of jet on local fuel-air ratio, which indicated that a pure air jet deteriorates the local kerosene-air ratio and has an adverse influence on flame propagation. On the other hand, a jet made by a keroseneair mixture can effectively accelerate the flame propagation (Zhao et al, 2017). The methane-air flame acceleration and DDT process in a duct with jet in crossflow was experimentally studied by PIV and Schlieren photography, which showed that the fluidic obstacles are more effective at transitioning the laminar flame to a turbulent flame than the solid obstacles.…”

Section: Introductionmentioning

confidence: 99%

Effects of Transverse Jet Parameters on Flame Propagation and Detonation Transition in Hydrogen–Oxygen–Argon Mixture

Han

Huang

Deiterding

et al. 2019

Combustion Science and Technology

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Effects of transverse jet parameters on flame propagation and detonation transition in hydrogen-oxygen-argon mixtureTwo-dimensional numerical simulation is performed with the open-source program AMROC to study the effects of transverse jets (act as fluidic obstacles within a detonation tube) on the flame acceleration and deflagration to detonation transition (DDT). The slot transverse jets have been studied and compared with conventional solid obstacles in tubes. The jet initial parameters, such as mixture composition, stagnation temperature, pressure and mass flow rate, are investigated.The results demonstrate that a hydrogen-oxygen-argon reactive fluidic obstacle leads to the shortest DDT distance and time compared with solid obstacles and fluidic obstacles composed of pure oxygen or argon. The fluidic obstacles can induce more vorticities to accelerate flame propagation. The DDT distance and time decrease with the jet initial temperature, pressure and mass flow rate rise, while a high jet initial stagnation temperature is counterproductive to shorting DDT distance and time. The local static pressure rise plays an important role in flame acceleration when increasing the initial pressure of the fluidic obstacle. Higher jet pressure and a wider jet induce more compression waves, which can make the initial flame front more unstable and accelerate the flame as well.

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Effects of a jet turbulator upon flame acceleration in a detonation tube

Cited by 18 publications

References 6 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

Bibliographic Review: The Influence of Obstacles Inside the Ducts on the Flow Proprieties

Effects of Transverse Jet Parameters on Flame Propagation and Detonation Transition in Hydrogen–Oxygen–Argon Mixture

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