Gotowe bibliografie tematyczne / Flame geometrics

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  1. Artykuły w czasopismach
  2. Rozprawy doktorskie
  3. Książki
  4. Części książek
  5. Streszczenia konferencji
  6. Raporty organizacyjne

Gotowa bibliografia na temat „Flame geometrics”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Flame geometrics"

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Sun, Y., N. Liu, and W. Gao. "Experimental Study on Geometrical Characteristics of a Square Turbulent Buoyant Jet Flame." Journal of Physics: Conference Series 2442, no. 1 (2023): 012020. http://dx.doi.org/10.1088/1742-6596/2442/1/012020.

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Abstract This paper gives the experimental results for the buoyant jet diffusion flame in square burners. The flame height and lift-off were measured and discussed. The results show that the normalized flame height and lift-off height of square flames are lower than that of round flames with the same experimental conditions, which indicates enhanced air entrainment in square flames. The model of flame height based on the flame Froude-number, which integrates a correction factor to account for the enhancement of air entrainment, reasonably collapses the square flame data under different experim
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Villani, Manfredi, and Phillip Aquino. "Turbulent Flame Geometry Measurements in a Mass-Production Gasoline Direct Injection Engine." Energies 13, no. 1 (2020): 189. http://dx.doi.org/10.3390/en13010189.

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Direct optical access to the combustion chamber of a gasoline direct injection (GDI) engine provides extremely valuable information about the combustion process. Experimental measurements of the geometric characteristics of the turbulent flame—such as the flame radius, flame center, flame edges and flame brush thickness—are of fundamental interest in support of the development and validation of any combustion model. To determine the macroscopic properties of sprays and flames, visualization and digital image processing techniques are typically used in controlled experimental setups like single
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Hicks, E. P. "Rayleigh–Taylor unstable flames at higher Reynolds number." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 36–51. http://dx.doi.org/10.1093/mnras/stz2080.

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ABSTRACT Rayleigh–Taylor (RT) unstable flames are a key component of Type Ia and Iax supernovae explosions, but their complex hydrodynamics is still not well understood. These flames are affected not only by the RT instability, but also by the turbulence it generates. Both processes can increase the flame speed by stretching and wrinkling the flame. This makes it hard to choose a subgrid model for the flame speed in full star Type Ia or Iax simulations. Commonly used subgrid models get around this difficulty by assuming that either the RT instability or turbulence is dominant and sets the flam
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Thiesset, F., F. Halter, C. Bariki, et al. "Isolating strain and curvature effects in premixed flame/vortex interactions." Journal of Fluid Mechanics 831 (October 13, 2017): 618–54. http://dx.doi.org/10.1017/jfm.2017.641.

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This study focuses on the response of premixed flames to a transient hydrodynamic perturbation in an intermediate situation between laminar stretched flames and turbulent flames: an axisymmetric vortex interacting with a flame. The reasons motivating this choice are discussed in the framework of turbulent combustion models and flame response to the stretch rate. We experimentally quantify the dependence of the flame kinematic properties (displacement and consumption speeds) to geometrical scalars (stretch rate and curvature) in flames characterized by different effective Lewis numbers. Whilst
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Smyth, N. F. "Propagation of flame fronts." Journal of the Australian Mathematical Society. Series B. Applied Mathematics 31, no. 4 (1990): 385–96. http://dx.doi.org/10.1017/s0334270000006743.

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AbstractThe propagation of a flame front in a combusting gas is considered in the limit in which the width of the reaction-zone is small compared with some overall flow dimension. In this approximation, the front propagates along its normals at a speed dependent on the local curvature of the front and is governed by a nonlinear equivalent of the geometric optics equations. Some exact solutions of this equation are found and a numerical scheme is developed to solve the equation for more complicated geometries.
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Adebiyi, Abdulafeez, Olatunde Abidakun, and V’yacheslav Akkerman. "Acceleration of Premixed Flames in Obstructed Pipes with Both Extremes Open." Energies 13, no. 16 (2020): 4094. http://dx.doi.org/10.3390/en13164094.

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Premixed flame propagation in obstructed channels with both extremes open is studied by means of computational simulations of the reacting flow equations with a fully-compressible hydrodynamics, transport properties (heat conduction, diffusion and viscosity) and an Arrhenius chemical kinetics. The aim of this paper is to distinguish and scrutinize various regimes of flame propagation in this configuration depending on the geometrical and thermal-chemical parameters. The parametric study includes various channel widths, blockage ratios, and thermal expansion ratios. It is found that the interpl
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Chien, Yu-Chien, and Derek Dunn-Rankin. "Combustion Characteristics of Methane Hydrate Flames." Energies 12, no. 10 (2019): 1939. http://dx.doi.org/10.3390/en12101939.

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This research studies the structure of flames that use laboratory-produced methane hydrates as fuel, specifically for the purpose of identifying their key combustion characteristics. Combustion of a methane hydrate involves multiple phase changes, as large quantities of solid clathrate transform into fuel gas, water vapor, and liquid water during burning. With its unique and stable fuel energy storage capability, studies in combustion are focused on the potential usage of hydrates as an alternative fuel source or on their fire safety. Considering methane hydrate as a conventional combustion en
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Abam, D. P. S. "Methane Combustion in Laminar Diffusion Flames." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power Engineering 203, no. 1 (1989): 65–72. http://dx.doi.org/10.1243/pime_proc_1989_203_008_02.

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This paper is concerned with methane combustion in laminar diffusion flames. Data on methane concentration distributions in different diffusion flame geometries are correlated against a conserved scalar called mixture fraction. The correlation is used to determine a global methane combustion rate applicable in the rich to stoichiometric regions of laminar diffusion flames. The global rate is consistent with methane disappearance through the forward kinetic step: CH4 + H → CH3 + H2 with [H] equilibrated according to [Formula: see text] on the rich side. This equilibration results from the three
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Sattelmayer, T., W. Polifke, D. Winkler, and K. Do¨bbeling. "NOx-Abatement Potential of Lean-Premixed GT Combustors." Journal of Engineering for Gas Turbines and Power 120, no. 1 (1998): 48–59. http://dx.doi.org/10.1115/1.2818087.

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The influence of the structure of perfectly premixed flames on NOx formation is investigated theoretically. Since a network of reaction kinetics modules and model flames is used for this purpose, the results obtained are independent of specific burner geometries. Calculations are presented for a mixture temperature of 630 K, an adiabatic flame temperature of 1840 K, and 1 and 15 bars combustor pressure. In particular, the following effects are studied separately from each other: • molecular diffusion of temperature and species; • flame strain; • local quench in highly strained flames and subse
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Winkler, Dieter, Weiqun Geng, Geoffrey Engelbrecht, Peter Stuber, Klaus Knapp, and Timothy Griffin. "Staged combustion concept for gas turbines." Journal of the Global Power and Propulsion Society 1 (September 27, 2017): CVLCX0. http://dx.doi.org/10.22261/cvlcx0.

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AbstractGas turbine power plants with high load flexibility are particularly suitable to compensate power fluctuations of wind and solar plants. Conventional gas turbines suffer from higher emissions at low load operation. With the objective of improving this situation a staged combustion system has been investigated. At low gas turbine load an upstream stage (first stage) provides stable combustion at low emissions while at higher loads the downstream stage (second stage) is started to supplement the power. Three injection geometries have been studied by means of computational fluid dynamics
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Rozprawy doktorskie na temat "Flame geometrics"

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Bjorkhaug, M. "Flame acceleration in obstructed radial geometries." Thesis, City University London, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374279.

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Gabriel, Silva Vitor [Verfasser], and Ulrich [Gutachter] Krause. "Flame propagation in complex geometries / Vitor Gabriel Silva ; Gutachter: Ulrich Krause." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2020. http://d-nb.info/1219966495/34.

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Gabriel, Silva Vitor Verfasser], and Ulrich [Gutachter] [Krause. "Flame propagation in complex geometries / Vitor Gabriel Silva ; Gutachter: Ulrich Krause." Magdeburg : Universitätsbibliothek Otto-von-Guericke-Universität, 2020. http://d-nb.info/1219966495/34.

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Kučiš, Michal. "Simulace vlastností objektivu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2012. http://www.nusl.cz/ntk/nusl-236575.

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Computer vision algorithms typically process real world image data acquired by cameras or video cameras. Such image data suffer from imperfections cause by the acquisition process. This paper focuses on simulation of the acquisition process on simulation of the acquisition process in order to enable rendering of images based on a 3D generated model. Imperfections, such as geometry distorion, chromatic aberration, depth of field effect, motion blur, vignetting and lens flare are considered.
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Harshavardhana, A. U. "Flame Particle Tracking Analysis of Turbulence-Premixed Flame Interaction." Thesis, 2018. http://etd.iisc.ac.in/handle/2005/4187.

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This work describes the computational and theoretical developments made in the understanding of turbulence-premixed flame interaction, using both lean and rich H2-air mixtures, in a flow field of near-isotropic turbulence. Two classical flame geometries are considered for the present study viz., 1) statistically planar flame in an in flow-out flow channel (type-I) and 2) premixed igniting flame kernel in a box (type-II). These simple geometries, which could be considered as building blocks of turbulent flames in practical combustors, elucidate the intricate physics of turbulence-premixed ame i
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Książki na temat "Flame geometrics"

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1947-, Evans James W., Setiabudi Dody, and Forest Products Laboratory (U.S.), eds. Flake furnish characterization: Modeling board properties with geometric descriptors. U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1999.

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Flake Furnish Characterization, Modeling Board Properties With Geometric Descriptors... Research Paper FPL-RP-577... U.S. Department Of Agriculture. s.n., 1999.

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Części książek na temat "Flame geometrics"

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Xing, V., and C. J. Lapeyre. "Deep Convolutional Neural Networks for Subgrid-Scale Flame Wrinkling Modeling." In Lecture Notes in Energy. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-16248-0_6.

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AbstractSubgrid-scale flame wrinkling is a key unclosed quantity for premixed turbulent combustion models in large eddy simulations. Due to the geometrical and multi-scale nature of flame wrinkling, convolutional neural networks are good candidates for data-driven modeling of flame wrinkling. This chapter presents how a deep convolutional neural network called a U-Net is trained to predict the total flame surface density from the resolved progress variable. Supervised training is performed on a database of filtered and downsampled direct numerical simulation fields. In an a priori evaluation on a slot burner configuration, the network outperforms classical dynamic models. In closing, challenges regarding the ability of deep convolutional networks to generalize to unseen configurations and their practical deployment with fluid solvers are discussed.
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Kupervasser, Oleg. "Dynamics and Wrinkling of Radially Propagating Fronts Inferred from Scaling Laws in Channel Geometries." In Pole Solutions for Flame Front Propagation. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18845-4_4.

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Conceição, Eusébio, João Gomes, Maria Manuela Lúcio, Domingos Xavier Viegas, and Maria Teresa Viegas. "Two-dimensional model of heat transfer in a pine trunk under the influence of a forest fire environment." In Advances in Forest Fire Research 2022. Imprensa da Universidade de Coimbra, 2022. http://dx.doi.org/10.14195/978-989-26-2298-9_277.

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This paper presents a study on two-dimensional model of heat transfers in a pine tree trunk under the influence of a forest fire environment. In this study, a thermal response model of the tree trunk was developed, starting from a geometric model of complex topology of the trunk obtained using mesh generation. The thermal response model of the tree trunk is founded on energy and mass equations. In energy equations, heat exchanges are considered by conduction inside the tree trunk, by convection between the outside surface of the tree trunk and the surrounding environment and by radiation between the outside surface of the tree trunk and the surrounding area including the fire front. The heat exchanges by radiation between the tree trunk and the fire front are calculated using view factors obtained taking into account the geometric model of the tree trunk. In the numerical simulation, the forest fire environment is represented by a fire front, 10 m wide and 1 m high, which moves, with an inclination of 45º, at a constant speed. The numerical results of the temperature distribution tree trunk were obtained for a wind speed of 5 m/s and an average flame temperature of 500ºC. These results allow us to locate the tissues of the tree trunk that will reach lethal conditions.
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"Simple Models of Constant Flames in Three Partially Confined Geometries." In Dynamics of Reactive Systems Part I: Flames and Configurations; Part II: Modeling and Heterogeneous Combustion. American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/5.9781600865794.0180.0191.

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Paquet, A. F., and B. M. Paquet. "Estimating an Enclosure Temperature During Solid Propellant Fires." In Future Developments in Explosives and Energetics. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781788017855-00176.

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In any industrial energetic facility, it is useful to predict the effect of an accidental fire. Solid propellants are designed to quickly transform into high temperature gases. It is therefore necessary to predict the pressure evolution during a confined fire. Some methods are semi-empirical and thus do not depend on many thermodynamic variables. Other methods are numerical and require that many variables be defined. In any safety application, choosing the right method will depend on the risks involved, possible consequences and means available. Lack of precise knowledge of these variables is often what discourages facilities and equipment designers from modelling the behaviour of their systems. One such variable is the temperature in an enclosure during a fire for which the pressure generation is the main concern. For events involving low charge densities, using the flame temperature is an over-approximation. Assuming instantaneous perfect mixing of the enclosure air and combustion gases results in an under-approximation. In this paper, these approximations will first be considered compared to an event sequence. Three temperature models will be reviewed. Firstly, a simple model will consider the geometric mean of the previously described extreme values. Secondly, the radiative heating of the enclosure air due to a localized fire source will be studied. Finally, a finite volume multidimensional numerical model which includes turbulence effects will be presented. These three methods are seen to be of increasing complexity and will be compared to the event timescale. This timescale will help indicate if the level of complexity is warranted.
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Paquet, A. F., and B. M. Paquet. "Estimating an Enclosure Temperature During Solid Propellant Fires." In Future Developments in Explosives and Energetics. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781839162350-00176.

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In any industrial energetic facility, it is useful to predict the effect of an accidental fire. Solid propellants are designed to quickly transform into high temperature gases. It is therefore necessary to predict the pressure evolution during a confined fire. Some methods are semi-empirical and thus do not depend on many thermodynamic variables. Other methods are numerical and require that many variables be defined. In any safety application, choosing the right method will depend on the risks involved, possible consequences and means available. Lack of precise knowledge of these variables is often what discourages facilities and equipment designers from modelling the behaviour of their systems. One such variable is the temperature in an enclosure during a fire for which the pressure generation is the main concern. For events involving low charge densities, using the flame temperature is an over-approximation. Assuming instantaneous perfect mixing of the enclosure air and combustion gases results in an under-approximation. In this paper, these approximations will first be considered compared to an event sequence. Three temperature models will be reviewed. Firstly, a simple model will consider the geometric mean of the previously described extreme values. Secondly, the radiative heating of the enclosure air due to a localized fire source will be studied. Finally, a finite volume multidimensional numerical model which includes turbulence effects will be presented. These three methods are seen to be of increasing complexity and will be compared to the event timescale. This timescale will help indicate if the level of complexity is warranted.
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Streszczenia konferencji na temat "Flame geometrics"

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Knapton, Jonathan N., Simon Blakey, and Frank Nicolleau. "Understanding the Effects of Fractal Blockage Geometries on Flame Acceleration in Propane-Air Flames." In 51st AIAA/SAE/ASEE Joint Propulsion Conference. American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-4147.

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Hariharan, P., C. Periasamy, and S. R. Gollahalli. "Aspect Ratio Effects on Partially Premixed Flames From Elliptic Burners in Coflow." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13109.

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In this paper, partially premixed flames of propane-hydrogen blends from elliptic burner geometries in coflow environment have been experimentally studied. Two different elliptic burner geometries with aspect ratios (AR) of 3:1 and 4:1 were used. A circular burner with the same discharge area as that of the elliptic burner was employed for comparison. Measurements were taken at stoichiometric and three other equivalence ratios. Global flame characteristics such as visible height, emission indices, and flame radiation were measured. Flame structure data such as transverse profiles of inflame co
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Yalcinkaya, Yagiz, Ogeday E. Bozkurt, and Ayse G. Gungor. "Influence of Pressure Gradient on Flame-Vortex Interaction and Flame Stability." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82517.

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Abstract This study presents numerical investigations of turbulent premixed bluff-body stabilized flame by emphasizing the influence of pressure gradient on flame-vortex interaction and flame stability for lean combustion applications. Large eddy simulations of four different geometrical configurations, diffuser 3°, diffuser 1.5°, nominal, and nozzle that resulted in mild to strong pressure gradients are presented. Numerical investigations allowed determining the effects of geometry-induced pressure gradient on the flame structure, development of the flame-front vorticity and turbulent structu
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Zhu, Shengrong, and Sumanta Acharya. "Effects of Hydrogen Addition on Swirl-Stabilized Flame Properties." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23686.

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The role of hydrogen addition to swirl-stabilized methane flames is studied experimentally. Of specific interest are flame properties including flame surface density and curvature. The measurements are based on Particle Image Velocimetry (PIV), Mie-scattering and CH-chemiluminescence imaging. Identification of the flame front and its geometric characterization provides an understanding of the flame properties. Compared to the non-reacting flow, the methane flame broadens the central recirculation zone. Hydrogen enriched flames reduce the central recirculation zone and scales down the character
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Noda, Susumu, Yuzuru Nada, I. Gede Parwatha, and Shingo Fukushige. "Effects of Flow Field on Combustion Characteristics of Confined Jet Nonpremixed Flames." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32638.

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Confined flames are widely used in the industrial field. The flame characteristics can be strongly dominated by the combination of a burner and furnace geometries, which were not paid much attention before. In the present study, flow fields in confined flames are discussed in terms of the flame characteristics. The flow characteristics of confined flames have been investigated for propane nonpremixed flames in cylindrical furnaces. The effects of the inner diameter of the cylindrical furnace D1, the turbulence at the flame boundary, and the global equivalence ratio φ are examined in terms of t
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Ahmed, K. A., and D. J. Forliti. "Flame Holding and Combustion Characteristics of a Geometrical Flame Holder." In ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56304.

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Flame Stabilization in a high-speed premixed environment requires the presence of a mechanism to stabilize the flame. Bluff bodies or geometrical flame holders introduce a recirculation zone that anchor the flame. The current study considers the influence of equivalence ratio and the boundary layer state at the trailing edge of the flame holder on the flowfield and combustion characteristics. It was found that the recirculation zone is shortened as the equivalence ratio increases towards unity. A secondary shear region emerges downstream of the recirculation zone and is caused by the accelerat
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Baird, Benjamin D., and S. R. Gollahalli. "Effects of Temperature and Hydroxyl Radical Concentration Distributions on Emissions of Partially Premixed Flames From Elliptical Burners." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90065.

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Non-circular burner geometries have shown some promise of reducing pollutant emissions form combustion systems. The use of non-axisymmetric geometries has the potential to alter the behavior of a flame through modification of the flow field. To investigate these flow field effects on combustion performance, a study of the partially premixed flames emitted from a circular burner and a 3:1 aspect ratio (major axis / minor axis) elliptical burner of equal exit area was performed. For laminar conditions, the elliptical and circular burner produced similar global emissions of carbon monoxide and ni
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Bade, Stefanie, Michael Wagner, Christoph Hirsch, Thomas Sattelmayer, and Bruno Schuermans. "Design for Thermo-Acoustic Stability: Modeling of Burner and Flame Dynamics." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95058.

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A Design for Thermo-Acoustic Stability (DeTAS) procedure is presented, that aims at selecting a most stable burner geometry for a given combustor. It is based on the premise that a thermo-acoustic stability model of the combustor can be formulated and that a burner design exists, which has geometric design parameters that sufficiently influence the dynamics of the flame. Describing the flame dynamics in dependence of the geometrical parameters an optimization procedure involving a linear stability model of the target combustor maximizes the damping and thereby yields the optimal geometrical pa
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Hariharan, P., and S. R. Gollahalli. "Effect of Equivalence Ratio and Burner Geometry on the Characteristics of Laminar Premixed Flames at Moderate Coflow." In ASME 2004 Power Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/power2004-52015.

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The importance of studying laminar premixed flames lies in applications such as gas ranges and ovens, heating appliances and Bunsen burners. With the current demand for large amounts of economical, clean power, there is a need for research in increasing the combustion efficiency. Laminar premixed Propane/Hydrogen/Air flames with 3 m/s coflow and without coflow, with a variation of jet equivalence ratio (JEQ) from 0.5 to 4 for 20 m/s jet velocity, have been studied experimentally to determine the interactions of burner geometry of premixed flames and coflow. Two different burner geometries (cir
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Hariharan, P., and S. R. Gollahalli. "Characteristics of Partially Premixed Elliptic Burner Flames in Coflow-Velocity Air Streams." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60336.

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This paper presents the results of an extension of the previous study where the effects of jet equivalence ratio and burner geometry on the characteristics of partially premixed propane/hydrogen/air flames at a coflow air velocity of 3 m/s were presented. The results here pertain to the experiments where the coflow velocity was doubled to understand the effects of coflow. Two different burner geometries (Circular, and 3:1 aspect ratio-AR elliptical burners) were used in the experiments with circular burner flames as baseline condition. During the study, the exit velocity was held constant at 2
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Raporty organizacyjne na temat "Flame geometrics"

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Beshouri. PR-309-04200-R01 Modeling Methodology for Parametric Emissions Monitoring System for Combustion Turbines. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0010731.

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Prior attempts to develop a generic Parametric Emissions Monitoring methodology for combustion turbines, particularly low emissions units, have failed due either to the reduction of a complex problem to too few degrees of freedom or the brute force reliance on regression analysis. Field test data collected by the research team clearly illustrated that a successful PEMS model will need to incorporate multiple zones to account for pilot fuel versus pre-mixed combustion, and changes in air/fuel ratio at the flame front. The information reported herein shows that, ideally, the PEMS model should re
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