Transient electric field response of laminar premixed flames

Kuhl, Johannes; Jovičić, Gordana; Zigan, Lars; Leipertz, Alfred

doi:10.1016/j.proci.2012.07.016

Cited by 27 publications

(14 citation statements)

References 16 publications

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“…Additionally, the understanding of the analysis on the modification of flame responses and structure under the electric field would be a benefit. Especially research on the response time [25,26] of the flame can give information about how fast the electric field can be applied to control a flame, which is important for technical applications. The objective of this paper is to study the effects of the electric fields on premixed methane-air combustion under lean conditions based on the spherical flame pattern.…”

Section: Introductionmentioning

confidence: 99%

Effects of Electric Fields on the Combustion Characteristics of Lean Burn Methane-Air Mixtures

Fang

Duan

et al. 2015

Energies

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Abstract:In this work, the effects of the electric fields on the flame propagation and combustion characteristics of lean premixed methane-air mixtures were experimentally investigated in a constant volume chamber. Results show that the flame front is remarkably stretched by the applied electric field, the stretched flame propagation velocity and the average flame propagation velocity are all accelerated significantly as the input voltage increases. This indicates that the applied electric field can augment the stretch in flame, and the result is more obvious for leaner mixture. According to the analyses of the combustion pressure variation and the heat release rate, the peak combustion pressure Pmax increases and its appearance time tp is advanced with the increase of the input voltage. For the mixture of λ = 1.6 at the input voltage of −12 kV, Pmax increases by almost 12.3%, and tp is advanced by almost 31.4%, compared to the case of without electric fields. In addition, the normalized mass burning rate and the accumulated mass fraction burned are all enhanced substantially, and the flame development duration and the rapid burning duration are remarkably reduced with the increase of the input voltage, and again, the influence of electric field is more profound for leaner mixtures. The results can be explained by the electric field-induced stretch effects on lean burn methane-air mixture. OPEN ACCESSEnergies 2015, 8 2588

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Section: Introductionmentioning

confidence: 99%

Effects of Electric Fields on the Combustion Characteristics of Lean Burn Methane-Air Mixtures

Fang

Duan

et al. 2015

Energies

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“…This mechanism could also contribute to a controlled growth and aggregation of nano-particles in flame synthesis described in Section 2.3. Many fundamental experiments using lab-scale burners have been carried out for studying electric field enhanced combustion using premixed (see, e.g., [22][23][24][25][26][27][28][29][30]) and non-premixed flames [31,32]. Attempts for a technical application at higher thermal load were conducted by Weinberg et al for a meso-scale burner [33], by Sakhrieh et al for a Bunsen flame array [34] and Altendorfner et al [35] for a swirl flame that is usually applied in gas-turbine burners.…”

Section: Electric Field Assisted Combustionmentioning

confidence: 99%

“…Furthermore, particle image velocimetry (PIV) was used for measurement of the flow field variation in the flame that was subjected to the electric field. It was described that the flame responds to the e-field within 2-4 ms [25,26], while the shape of the flame was not significantly changed. After activation of the electric field, a disturbance was initialized at the bottom of the flame.…”

Section: Flame Stabilisationmentioning

confidence: 99%

“…In Refs. [25,26], it was shown that the flame can adopt the frequency of a transient weak electric field up to 200 Hz. For 200 Hz, the period between activation and deactivation of the e-field is much shorter than the flame response time (which is about 2-4 ms, as mentioned above).…”

Section: Flame Stabilisationmentioning

confidence: 99%

“…Furthermore, a higher flame temperature is expected as also increased NO x -emissions were observed when electric flames were applied to flames [34]. For clarification, manifold fundamental studies were conducted in lab-scale flames using various optical diagnostics [24][25][26][27] (see also Section 5).…”

Section: Electric Fields For Controlling Pollutant Emissions Of Flamesmentioning

confidence: 99%

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Overview of Electric Field Applications in Energy and Process Engineering

Zigan

2018

Energies

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Heat and mass transfer as well as chemical reactions in technical processes can be enhanced by using electric fields. This paper provides an overview of current fundamental and applied research as well as potential technical applications of electric fields in energy and process engineering. This includes electrosprays, technical combustors as well as electrochemical reforming and plasma gasification of waste or biomass. Other emerging fields are plasma technologies for treatment of water, surfaces and gases including flue gases. In particle or aerosol-laden flows, plasmas are used to promote particle nucleation and surface growth for controlled nanomaterial synthesis. Furthermore, non-invasive diagnostics based on electromagnetic fields and electric fluid properties are relevant techniques for online control and optimization of technical processes. Finally, an overview of laser-based techniques is provided for studying electro-hydrodynamic effects, temperature, and species concentrations in plasma and electric-field enhanced processes.

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