Numerical Study of Electric Field Enhanced Combustion

dc.contributor.advisorBisetti, Fabrizio
dc.contributor.authorHan, Jie
dc.contributor.committeememberIm, Hong G.
dc.contributor.committeememberFarooq, Aamir
dc.contributor.committeememberSarathy, Mani
dc.contributor.committeememberv.Oijen, A. Jeroen
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.date.accessioned2016-12-26T12:13:01Z
dc.date.available2016-12-26T12:13:01Z
dc.date.issued2016-12-26
dc.description.abstractElectric fields can be used to change and control flame properties, for example changing flame speed, enhancing flame stability, or reducing pollutant emission. The ions generated in flames are believed to play the primary role. Although experiments have been carried out to study electric field enhanced combustion, they are not sufficient to explain how the ions in a flame are affected by an electric field. It is therefore necessary to investigate the problem through numerical simulations. In the present work, the electric structure of stabilized CH4/air premixed flames at atmospheric pressure within a direct current field is studied using numerical simulations. This study consists of three parts. First, the transport equations are derived from the Boltzmann kinetic equation for each individual species. Second, a general method for computing the diffusivity and mobility of ions in a gas mixture is introduced. Third, the mechanisms for neutral and charged species are improved to give better predictions of the concentrations of charged species, based on experimental data. Following from this, comprehensive numerical results are presented, including the concentrations and fluxes of charged species, the distributions of the electric field and electric potential, and the electric current-voltage relation. Two new concepts introduced with the numerical results are the plasma sheath and dead zone in the premixed flame. A reactive plasma sheath and a Boltzmann relation sheath are discovered in the region near the electrodes. The plasma sheath penetrates into the flame gas when a voltage is applied, and penetrating further if the voltage is higher. The zone outside the region of sheath penetration is defined as the dead zone. With the two concepts, analytical solutions for the electric field, electric potential and current-voltage curve are derived. The solutions directly describe the electric structure of a premixed flame subject to a DC field. These analytical solutions, together with the discovery of the plasma sheath and dead zone in flames, are the novel contributions of this work.
dc.identifier.citationHan, J. (2016). Numerical Study of Electric Field Enhanced Combustion. KAUST Research Repository. https://doi.org/10.25781/KAUST-989EI
dc.identifier.doi10.25781/KAUST-989EI
dc.identifier.urihttp://hdl.handle.net/10754/622070
dc.internal.reviewer-noteORCID request sent to Jie Han. - DG
dc.language.isoen
dc.person.id115864
dc.subjectElectric Field
dc.subjectCombustion
dc.subjectPlasma Shealth
dc.subjectPremixed flame
dc.subjectDead Zone
dc.titleNumerical Study of Electric Field Enhanced Combustion
dc.typeDissertation
display.details.left<span><h5>Type</h5>Dissertation<br><br><h5>Authors</h5><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0002-6176-8684&spc.sf=dc.date.issued&spc.sd=DESC">Han, Jie</a> <a href="https://orcid.org/0000-0002-6176-8684" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><br><h5>Advisors</h5><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0001-5162-7805&spc.sf=dc.date.issued&spc.sd=DESC">Bisetti, Fabrizio</a> <a href="https://orcid.org/0000-0001-5162-7805" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><br><h5>Committee Members</h5><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0001-7080-1266&spc.sf=dc.date.issued&spc.sd=DESC">Im, Hong G.</a> <a href="https://orcid.org/0000-0001-7080-1266" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0001-5296-2197&spc.sf=dc.date.issued&spc.sd=DESC">Farooq, Aamir</a> <a href="https://orcid.org/0000-0001-5296-2197" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br><a href="https://repository.kaust.edu.sa/search?query=orcid.id:0000-0002-3975-6206&spc.sf=dc.date.issued&spc.sd=DESC">Sarathy, Mani</a> <a href="https://orcid.org/0000-0002-3975-6206" target="_blank"><img src="https://repository.kaust.edu.sa/server/api/core/bitstreams/82a625b4-ed4b-40c8-865a-d6a5225a26a4/content" width="16" height="16"/></a><br>v.Oijen, A. Jeroen<br><br><h5>Program</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.program=Mechanical Engineering,equals">Mechanical Engineering</a><br><br><h5>KAUST Department</h5><a href="https://repository.kaust.edu.sa/search?spc.sf=dc.date.issued&spc.sd=DESC&f.department=Physical Science and Engineering (PSE) Division,equals">Physical Science and Engineering (PSE) Division</a><br><br><h5>Date</h5>2016-12-26</span>
display.details.right<span><h5>Abstract</h5>Electric fields can be used to change and control flame properties, for example changing flame speed, enhancing flame stability, or reducing pollutant emission. The ions generated in flames are believed to play the primary role. Although experiments have been carried out to study electric field enhanced combustion, they are not sufficient to explain how the ions in a flame are affected by an electric field. It is therefore necessary to investigate the problem through numerical simulations. In the present work, the electric structure of stabilized CH4/air premixed flames at atmospheric pressure within a direct current field is studied using numerical simulations. This study consists of three parts. First, the transport equations are derived from the Boltzmann kinetic equation for each individual species. Second, a general method for computing the diffusivity and mobility of ions in a gas mixture is introduced. Third, the mechanisms for neutral and charged species are improved to give better predictions of the concentrations of charged species, based on experimental data. Following from this, comprehensive numerical results are presented, including the concentrations and fluxes of charged species, the distributions of the electric field and electric potential, and the electric current-voltage relation. Two new concepts introduced with the numerical results are the plasma sheath and dead zone in the premixed flame. A reactive plasma sheath and a Boltzmann relation sheath are discovered in the region near the electrodes. The plasma sheath penetrates into the flame gas when a voltage is applied, and penetrating further if the voltage is higher. The zone outside the region of sheath penetration is defined as the dead zone. With the two concepts, analytical solutions for the electric field, electric potential and current-voltage curve are derived. The solutions directly describe the electric structure of a premixed flame subject to a DC field. These analytical solutions, together with the discovery of the plasma sheath and dead zone in flames, are the novel contributions of this work.<br><br><h5>Citation</h5>Han, J. (2016). Numerical Study of Electric Field Enhanced Combustion. KAUST Research Repository. https://doi.org/10.25781/KAUST-989EI<br><br><h5>DOI</h5><a href="https://doi.org/10.25781/KAUST-989EI">10.25781/KAUST-989EI</a></span>
orcid.id0000-0002-3975-6206
orcid.id0000-0001-5296-2197
orcid.id0000-0001-7080-1266
orcid.id0000-0001-5162-7805
orcid.id0000-0002-6176-8684
refterms.dateFOA2018-06-13T15:01:08Z
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorKing Abdullah University of Science and Technology
thesis.degree.nameDoctor of Philosophy
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