Flame Structure and Chemiluminescence Emissions of Inverse Diffusion Flames under Sinusoidally Driven Plasma Discharges

Giorgi, Maria Grazia De; Sciolti, Aldebara; Campilongo, Stefano; Ficarella, Antonio

doi:10.3390/en10030334

Cited by 15 publications

(6 citation statements)

References 45 publications

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“…Nowadays, plasma ignited combustion is one of the most prominent and leading technology due to its growing interest in the applications of aeronautical engines [1]. Plasma discharge has the potential to enhance the combustion and flame stability by three ways: thermal effect due to Joule heating, kinetic effect with production of ions, electrons, excited species and free radicals, and the last one via transport (low temperature oxidation and fuel decomposition) [2][3]. Concerning the chemistry modification induced by plasma discharges, kinetic processes occur when electron gained additional energy and collides with gas mixture.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the impact of nanosecond plasma discharge on the combustion of methane air flames

et al. 2020

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At present, development of plasma assisted ignition and combustion is a very promising research area due to its wide applications in the field of aeronautical engines and power sector. Plasma discharge can improve the combustion because it produces large number of chemically active particles which affects the chemical reaction. Simulation is an effective tool to analyze the interaction between the plasma and the flame through the implementation of plasma-assisted combustion. This study focused on three main objectives. Initially a microscopic plasma model with detailed kinetic plasma mechanisms was developed, then the validation of these mechanisms in air/methane mixture has been performed. Finally, the effects of nano pulsed plasma discharge on combustion have been investigated. In order to accomplish the above task, two numerical tools Chemical Kinetic Solver (CHEMKIN) and Plasma Kinetic Solver (ZDPlasKin) are used. It was found that the kinetic model of plasma provides good overall agreement with experimental data and identify key processes for species (e.g. O atom) generation and decay. The results showed that with the increase of reduced electric field, active particles and intermediate species/radicals (in particular ozone) are increased. ZDPlasKin results were incorporated in CHEMKIN to investigate and compare the flame speed, thermal and chemical effect by using a GRI-Mech scheme modified with the addition of ozone reactions. It has been found that with the adding of plasma flame speed was increased up to 26% at stoichiometric ratio. The chemical heat release also showed increment at low temperatures that confirmed the combustion enhancement. Furthermore, ignition delay timings were significantly reduced with the plasma excitation.

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Section: Introductionmentioning

confidence: 99%

Assessment of the impact of nanosecond plasma discharge on the combustion of methane air flames

et al. 2020

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“…Mei et al [16] studied the effects of coflow velocity on flame shape and size by performing CFD calculation. Giorgi et al [17] observed the flame structure for an inverse diffusion combustion with a chemiluminescence emission method. Wang et al [18] examined the evolution of the flame length of a buoyant jet diffusion flame restricted by parallel sidewalls at reduced pressure; they pointed out that the flame length at decreased pressure is found to be slightly longer than that at normal pressure.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Flame Shape and Size for a High-Pressure Turbulent Non-Premixed Swirl Combustion

et al. 2018

Energies

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Flame shape and size for a high-pressure turbulent non-premixed swirl combustion were experimentally investigated over a wide range of varying parameters including fuel mass flow rate, combustor pressure, primary-air mass flow rate, and nozzle exit velocity. A CFD simulation was conducted to predict the flame profile. Meanwhile, a theoretical calculation was also performed to estimate flame length. It was observed that flame length increased linearly with increasing fuel mass flow rate but decreased with the increment of combustor pressure in the power function. The flame diminished at a larger primary-air mass flow rate but remained unaffected by the increasing nozzle exit velocity. Considering the global effect of all parameters at a particular pressure, the flame length generally decreased as the primary-air to fuel ratio increased. This was attributed to the reduced air entrainment required to dilute the fuel to stoichiometric proportions. The CFD simulation offered a good prediction of the variation trends of flame length, although some deviations from experimental values were observed. The theoretical calculation estimated the trends of flame length variation particularly well. Nevertheless the difference between the theoretical and experimental results was found to be due to the swirl influence. Hence, a swirl factor was proposed to be added to the original equation for swirl flames.

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“…A novel technology that emerged as an alternative to fluidic actuators at the end of the 1990s and is suitable for use in gas flows is to use dielectric barrier discharge (DBD) plasma [64][65][66][67][68]. The DBD plasma actuators can induce steady or unsteady jets tangential to the surface on which they are mounted causing a net flux of momentum to the exterior flow somewhat similar to the synthetic jet.…”

Section: Afc Local Actuatorsmentioning

confidence: 99%

Active Control of Bluff-Body Flows Using Plasma Actuators

Konstantinidis

2019

Actuators

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Actuators play an important role in modern active flow control technology. Dielectric barrier discharge plasma can be used to induce localized velocity perturbations in air, so as to accomplish modifications to the global flow field. This paper presents a selective review of applications from the published literature with emphasis on interactions between plasma-induced perturbations and original unsteady fields of bluff-body flows. First, dielectric barrier discharge (DBD)-plasma actuator characteristics, and the local disturbance fields these actuators induce into the exterior flow, are described. Then, instabilities found in separated flows around bluff bodies that controlled actuation should target at are briefly presented. Key parameters for effective control are introduced using the nominally two-dimensional flow around a circular cylinder as a paradigm. The effects of the actuator configuration and location, amplitude and frequency of excitation, input waveform, as well as the phase difference between individual actuators are illustrated through examples classified based on symmetry properties. In general, symmetric excitation at frequencies higher than approximately five times the uncontrolled frequency of vortex shedding acts destructively on regular vortex shedding and can be safely employed for reducing the mean drag and lift fluctuations. Antisymmetric and symmetric excitation at low frequencies of the order of the natural frequency can amplify the wake instability and increase the mean and fluctuating aerodynamic forces, respectively, due to vortex locking-on to the excitation frequency or its subharmonics. Results from several studies show that the geometry and arrangement of the electrodes is of utmost significance. Power consumption is typically very low, but the electromechanical efficiency can be optimized by input waveform modulation.

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Flame Structure and Chemiluminescence Emissions of Inverse Diffusion Flames under Sinusoidally Driven Plasma Discharges

Cited by 15 publications

References 45 publications

Assessment of the impact of nanosecond plasma discharge on the combustion of methane air flames

Assessment of the impact of nanosecond plasma discharge on the combustion of methane air flames

An Investigation on Flame Shape and Size for a High-Pressure Turbulent Non-Premixed Swirl Combustion

Active Control of Bluff-Body Flows Using Plasma Actuators

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