Relevant bibliographies by topics / Premixed Combustion

Academic literature on the topic 'Premixed Combustion'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Premixed Combustion"

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Steele, Robert C., Luke H. Cowell, Steven M. Cannon, and Clifford E. Smith. "Passive Control of Combustion Instability in Lean Premixed Combustors." Journal of Engineering for Gas Turbines and Power 122, no. 3 (May 15, 2000): 412–19. http://dx.doi.org/10.1115/1.1287166.

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A Solar fuel injector that provides lean premixed combustion conditions has been studied in a combined experimental and numerical investigation. Lean premixed conditions can be accompanied by excessive combustion driven pressure oscillations which must be eliminated before the release of a final combustor design. In order to eliminate the pressure oscillations the location of fuel injection was parametrically evaluated to determine a stable configuration. It was observed that small axial changes in the position of the fuel spokes within the premix duct of the fuel injector had a significant positive effect on decoupling the excitation of the natural acoustic modes of the combustion system. In order to further understand the phenomenon, a time-accurate 2D CFD analysis was performed. 2D analysis was first calibrated using 3D steady-state CFD computations of the premixer in order to model the radial distribution of velocities in the premixer caused by non-uniform inlet conditions and swirling flow. 2D time-accurate calculations were then performed on the baseline configuration. The calculations captured the coupling of heat release with the combustor acoustics, which resulted in excessive pressure oscillations. When the axial location of the fuel injection was moved, the CFD analysis accurately captured the fuel time lag to the flame-front, and qualitatively matched the experimental findings. [S0742-4795(00)01103-0]
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Libby, P. A., S. Sivasegaram, and J. H. Whitelaw. "Premixed combustion." Progress in Energy and Combustion Science 12, no. 4 (January 1986): 393–405. http://dx.doi.org/10.1016/0360-1285(86)90007-9.

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Anand, M. S., and F. C. Gouldin. "Combustion Efficiency of a Premixed Continuous Flow Combustor." Journal of Engineering for Gas Turbines and Power 107, no. 3 (July 1, 1985): 695–705. http://dx.doi.org/10.1115/1.3239791.

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Experimental data in the form of radial profiles of mean temperature, gas composition and velocity at the combustor exit and combustion efficiency are reported and discussed for a swirling flow, continuous combustor. The combustor is composed of two confined, concentric independently swirling jets: an outer, annular air jet and a central premixed fuel-air jet, the fuel being propane or methane. Combustion is stabilized by a swirl-generated central recirculation zone. The primary objective of this research is to determine the effect of fuel substitution and of changes in outer flow swirl conditions on combustor performance. Results are very similar for both methane and propane. Changes in outer flow swirl cause significant changes in exit profiles, but, surprisingly, combustion efficiency is relatively unchanged. A combustion mechanism is proposed which qualitatively explains the results and identifies important flow characteristics and physical processes determining combustion efficiency. It is hypothesized that combustion occurs in a thin sheet, similar in structure to a premixed turbulent flame, anchored on the combustor centerline just upstream of the recirculation zone and swept downstream with the flow. Combustion efficiency depends on the extent of the radial propagation, across mean flow streamtubes, of this reaction sheet. It is concluded that, in general, this propagation and hence efficiency are extremely sensitive to flow conditions.
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Brookes, S. J., R. S. Cant, I. D. J. Dupere, and A. P. Dowling. "Computational Modeling of Self-Excited Combustion Instabilities." Journal of Engineering for Gas Turbines and Power 123, no. 2 (January 1, 2001): 322–26. http://dx.doi.org/10.1115/1.1362662.

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It is well known that lean premixed combustion systems potentially offer better emissions performance than conventional non-premixed designs. However, premixed combustion systems are more susceptible to combustion instabilities than non-premixed systems. Combustion instabilities (large-scale oscillations in heat release and pressure) have a deleterious effect on equipment, and also tend to decrease combustion efficiency. Designing out combustion instabilities is a difficult process and, particularly if many large-scale experiments are required, also very costly. Computational fluid dynamics (CFD) is now an established design tool in many areas of gas turbine design. However, its accuracy in the prediction of combustion instabilities is not yet proven. Unsteady heat release will generally be coupled to unsteady flow conditions within the combustor. In principle, computational fluid dynamics should be capable of modeling this coupled process. The present work assesses the ability of CFD to model self-excited combustion instabilities occurring within a model combustor. The accuracy of CFD in predicting both the onset and the nature of the instability is reported.
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Yang, Yao, Gaofeng Wang, Yuanqi Fang, YIfan Xia, and Liang Zhong. "IMAGING DIAGNOSTICS OF COMBUSTION INSTABILITY IN PREMIXED SWIRLING COMBUSTION." Journal of the Global Power and Propulsion Society 4 (May 22, 2020): 80–93. http://dx.doi.org/10.33737/jgpps/120536.

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An experimental study on combustion instability is presented with focus on propane-air premixed swirling flames. Swirling flames under self-excited oscillation are studied by imaging of visible light and OH* chemiluminescence filter under several typical conditions. The dynamical characteristics of swirling flames were analysed by Dynamic Mode Decomposition (DMD) method. Three types of unstable modes in the combustor system were observed, which correspond to typical acoustic resonant modes (LF mode, C1/4 mode and P1/2 mode) of the combustor system. The combustion instability is in the longitudinal mode. Furthermore, the structure of downstream hot burnt gas under stable combustion and unstable combustion is studied by imaging of visible light and near-infrared light. Results show that there is a significant difference in the downstream flow under stable combustion and unstable combustion. The DMD spectrum of the flame and the downstream hot burnt gas obtained is the same, which is close to the characteristic frequency of acoustic pressure captured by the microphone signal. The visible light and near-infrared light imaging observation method adopted in this paper provides a new imaging method for the investigation of thermo-acoustic instability.
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Dutta, P., J. P. Gore, and P. E. Sojka. "Emissions Characteristics of Liquid-Fueled Pilot Stabilized Lean Premixed Flames in a Tubular Premixer-Combustor." Journal of Engineering for Gas Turbines and Power 119, no. 3 (July 1, 1997): 585–90. http://dx.doi.org/10.1115/1.2817024.

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Global emissions of NOx in a liquid-fueled lean-premixed tubular combustor with a tubular premixer operating under atmospheric pressure are studied experimentally. The effects of equivalence ratio, premixer length, residence time, fuel type, and fuel atomization and dispersion characteristics on NOx emissions are studied. Measurements of exhaust species concentrations are used as the primary indicator of the effectiveness of premixing-prevaporization upstream of the combustor. Qualitative levels of prevaporization-premixing are determined from Mie-scattering signals measured at the exit of the premixer. Emission measurements show that the equivalence ratio is the dominant operating parameter, with premixing length and residence time being less significant within the present operating range. Ultra low NOx operation (<10 ppmv @ 15 percent 02) is feasible for equivalence ratios less than 0.5. More significantly, small drops persist beyond the premixer even for very long premixers, and Mie-scattering measurements show considerable spatial inhomogeneity, while allowing ultralow NOx operation. One-dimensional evaporation calculations for single drop trajectories confirm that complete evaporation for typical drop size distributions is not possible with reasonable premixer lengths under atmospheric pressure. Fuel dispersion is found to be the most critical parameter for high combustion efficiency, and adverse effects of poor fuel dispersion cannot be overcome by using longer premixers.
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Chein, Reiyu, Yen-Cho Chen, Jui-Yu Chen, and J. N. Chung. "Premixed Methanol–Air Combustion Characteristics in a Mini-scale Catalytic Combustor." International Journal of Chemical Reactor Engineering 14, no. 1 (February 1, 2016): 383–93. http://dx.doi.org/10.1515/ijcre-2014-0061.

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AbstractMethanol catalytic combustion in a mini-scale tubular quartz-made combustor is investigated in this study. An alumina sphere was employed as the support for the platinum catalyst. The experimental results showed that the combustion can be self-ignited at room temperature. Using the combustor wall temperature to characterize the combustor performance, it was found that the combustion temperature can reach a high value within a short time. The experimental results indicated that the combustor performance depends greatly on the fuel/air supply. A higher temperature can be obtained with a higher fuel/air flow rate. The insulated and non-insulated combustor experimental results indicated that heat loss to the environment is an important factor in governing the combustion characteristics due to the large surface/volume ratio. A higher temperature can also be obtained when the combustor is insulated. Because most of the combustion took place at the combustor entrance region, the experimental result suggested that the combustor length can be shortened, leading to a more compact design allowing the combustor integration with various applications. A simple numerical model was built to provide a greater understanding of the combustion characteristics and examine the heat loss effect on combustor performance.
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Clavin, P. "Premixed Combustion and Gasdynamics." Annual Review of Fluid Mechanics 26, no. 1 (January 1994): 321–52. http://dx.doi.org/10.1146/annurev.fl.26.010194.001541.

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Correa, S. M., A. J. Dean, and I. Z. Hu. "Combustion Technology for Low-Emissions Gas-Turbines:Selected Phenomena Beyond NOx." Journal of Energy Resources Technology 118, no. 3 (September 1, 1996): 193–200. http://dx.doi.org/10.1115/1.2793862.

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Since recent reviews cover the issues in NOx formation under gas-turbine canditions, and since regulations essentially dictate use of the premixed mode of combustion for minimum NOx, this review concentrates on phenomena that can arise in premixed combustion. Specifically, 1) the initial unmixedness in a fuel-air premixer has been shown to make overall lean mixtures autoignite sooner than might be expected based on the overall fuel-air ratio, because the richer portions of the mixture lead the process;2) combustion pressure oscillations caused by the interplay between acoustic waves and unsteady heat release in a one-dimensional system can be calculated in good accordance with measured data, and set the stage for multi-dimensional CFD;3) carbon deposition arising from the flow of liquid fuel over metal surfaces such as found in fuel injectors and swirl cups has been described as a function of temperature and of surface composition; and 4) quenching and subsequent emissions of carbon monoxide can be minimized by preservation of a boundary-layer rather than an impingement type of flow over combustor liners.
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Wirawan, I. K. G., I. N. G. Wardana, Rudy Soenoko, and Slamet Wahyudi. "Premixed Combustion of Coconut Oil on Perforated Burner." International Journal of Renewable Energy Development 2, no. 3 (October 30, 2013): 133–39. http://dx.doi.org/10.14710/ijred.2.3.133-139.

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Coconut oil premixed combustion behavior has been studied experimentally on perforated burner with equivalence ratio (φ) varied from very lean until very rich. The results showed that burning of glycerol needs large number of air so that the laminar burning velocity (SL) is the highest at very lean mixture and the flame is in the form of individual Bunsen flame on each of the perforated plate hole. As φ is increased the SL decreases and the secondary Bunsen flame with open tip occurs from φ =0.54 at the downstream of perforated flame. The perforated flame disappears at φ = 0.66 while the secondary Bunsen flame still exist with SL increases following that of hexadecane flame trend and then extinct when the equivalence ratio reaches one or more. Surrounding ambient air intervention makes SL decreases, shifts lower flammability limit into richer mixture, and performs triple and cellular flames. The glycerol diffusion flame radiation burned fatty acids that perform cellular islands on perforated hole. Without glycerol, laminar flame velocity becomes higher and more stable as perforated flame at higher φ. At rich mixture the Bunsen flame becomes unstable and performs petal cellular around the cone flame front. Keywords: cellular flame; glycerol; perforated flame;secondary Bunsen flame with open tip; triple flame
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Dissertations / Theses on the topic "Premixed Combustion"

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Porumbel, Ionut. "Large Eddy Simulation of premixed and partially premixed combustion." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14050.

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Large Eddy Simulation (LES) of bluff body stabilized premixed and partially premixed combustion close to the flammability limit is carried out in this thesis. The LES algorithm has no ad-hoc adjustable model parameters and is able to respond automatically to variations in the inflow conditions. Algorithm validation is achieved by comparison with reactive and non-reactive experimental data. In the reactive flow, two scalar closure models, Eddy Break-Up (EBULES) and Linear Eddy Mixing (LEMLES), are used and compared. Over important regions, the flame lies in the Broken Reaction Zone regime. Here, the EBU model assumptions fail. The flame thickness predicted by LEMLES is smaller and the flame is faster to respond to turbulent fluctuations, resulting in a more significant wrinkling of the flame surface. As a result, LEMLES captures better the subtle effects of the flame-turbulence interaction. Three premixed (equivalence ratio = 0.6, 0.65, and 0.75) cases are simulated. For the leaner case, the flame temperature is lower, the heat release is reduced and vorticity is stronger. As a result, the flame in this case is found to be unstable. In the rich case, the flame temperature is higher, and the spreading rate of the wake is increased due to the higher amount of heat release Partially premixed combustion is simulated for cases where the transverse profile of the inflow equivalence ratio is variable. The simulations show that for mixtures leaner in the core the vortical pattern tends towards anti-symmetry and the heat release decreases, resulting also in instability of the flame. For mixtures richer in the core, the flame displays sinusoidal flapping resulting in larger wake spreading. More accurate predictions of flame stability will require the use of detailed chemistry, raising the computational cost of the simulation. To address this issue, a novel algorithm for training Artificial Neural Networks (ANN) for prediction of the chemical source terms has been implemented and tested. Compared to earlier methods, the main advantages of the ANN method are in CPU time and disk space and memory reduction.
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Porumbel, Ionuţ. "Large Eddy Simulation of premixed and partially premixed combustion." Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11042006-042840/.

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Thesis (Ph. D.)--Aerospace Engineering, Georgia Institute of Technology, 2007.
Yeung, Pui-Kuen, Committee Member ; Lieuwen, Tim, Committee Member ; Menon, Suresh, Committee Chair ; Seitzman, Jerry, Committee Member ; Syed, Saadat, Committee Member.
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Mann, Kenneth R. C. "Premixed ammonia-methane-air combustion." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ62250.pdf.

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Chew, Tuan Chiong. "Aspects of premixed tubulent combustion." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292973.

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Haq, Md Zahurul. "Fundamental studies of premixed combustion." Thesis, University of Leeds, 1998. http://etheses.whiterose.ac.uk/1545/.

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The thesis comprises a fundamental study of spherical premixed flame propagation,originating at a point under both laminar and turbulent propagation. Schlieren cine photography has been employed to study laminar flame propagation, while planar mie scattering (PMS) has elucidated important aspects of turbulent flame propagation. Thrbulent flame curvature has also been studied using planar laser induced fluorescence (PLIF) images. Spherically expanding flames propagating at constant pressure have been employed to determine the unstretched laminar burning velocity and the effect of flame stretch, quantified by the associated Markstein lengths. Methane-air mixtures at initial temperatures between 300 and 400 K, and pressures between 0.1 and 1.0 MPa have been studied at equivalence ratios of 0.8, 1.0 and 1.2. Values of unstretched laminar burning velocity are correlated as functions of pressure, temperature and equivalence ratio. Two definitions of laminar burning velocity and their response to stretch due to curvature and flow strain are explored. Experimental results are compared with two sets of modeled predictions; one model considers the propagation of a spherically expanding flame using a reduced mechanism and the second considers a one dimensional flame using a full kinetic scheme. Data from the present experiments and computations are compared with those reported elsewhere. Comparisons are made with iso-octane-air mixtures and the contrast between fuels lighter and heavier than air is emphasized. Flame instability in laminar flame propagation become more pronounced at higher pressures, especially for lean and stoichiometric methane-air mixtures. Critical Peclet numbers for the onset of cellularity have been measured and related to the appropriate Markstein number. Analyses using flame photography clearly show the flame to accelerate as the instability develops, giving rise to a cellular flame structure. The underlying laws controlling the flame speed as cellularity develops have been explored. PMS images have been analysed to obtain the distributions of burned and unburned gas in turbulent flames. These have enabled turbulent burning velocities to be derived for stoichiometric methane-air at different turbulent r.m.s. velocities and initial pressures of 0.1 MPa and 0.5 MPa. A variety of ways of defining the turbulent burning velocity have been fruitfully explored. Relationships between these different burning velocities are deduced and their relationship with the turbulent flame speed derived. The deduced relationships have also been verified experimentally. Finally, distributions of flame curvature in turbulent flames have been measured experimentally using PMS and PLIF. The variance of the distribution increases with increase in the r.m.s. turbulent velocity and decrease in the Markstein number. Reasons for these effects are suggested.
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Undapalli, Satish. "Large eddy simulation of premixed and non-premixed combustion in a stagnation point reverse flow combustor." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22625.

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Thesis (Ph. D.)--Aerospace Engineering, Georgia Institute of Technology, 2008.
Committee Chair: Suresh, Menon; Committee Member: Ben T, Zinn; Committee Member: Jeff Jagoda; Committee Member: Jerry Seitzman; Committee Member: Thorsten Stoesser.
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Shelil, Nasser. "Flashback studies with premixed swirl combustion." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/55494/.

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The important conclusion was reached that when combusting H2/CH 4 fuel mixes flashback behaviour approaches that of pure methane for equivalence ratios less than about 0.65, all pressures investigated up to 7 bara and air inlet temperatures of 300 and 473K. Significant deleterious changes in flashback behaviour for H2/CH4 fuel mixes occurred for air inlet temperatures of 673K, although operation at weak equivalence ratios less than 0.65 was still beneficial.
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Kostiuk, Larry William. "Premixed turbulent combustion in counterflowing streams." Thesis, University of Cambridge, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305530.

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Keays, John F. "Large eddy simulation of premixed combustion." Thesis, Imperial College London, 2007. http://hdl.handle.net/10044/1/11284.

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Lim, Kian Min. "DNS of inhomogeneous reactants premixed combustion." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/247342.

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The search for clean and efficient combustors is motivated by the increasingly stringent emissions regulations. New gas turbine engines are designed to operate under lean conditions with inhomogeneous reactants to ensure cleanliness and stability of the combustion. This ushers in a new mode of combustion, called the inhomogeneous reactants premixed combustion. The present study investigates the effects of inhomogeneous reactants on premixed combustion, specifically on the interactions of an initially planar flame with field of inhomogeneous reactants. Unsteady and unstrained laminar methane-air flames are studied in one- and two-dimensional simulations to investigate the effects of normally and tangentially (to the flame surface) stratified reactants. A three-dimensional DNS of turbulent inhomogeneous reactants premixed combustion is performed to extend the investigation into turbulent flames. The methaneair combustion is represented by a complex chemical reaction mechanism with 18 species and 68 steps. The flame surface density (FSD) and displacement speed S_d have been used as the framework to analyse the inhomogeneous reactants premixed flame. The flames are characterised by an isosurface of reaction progress variable. The unsteady flames are compared to the steady laminar unstrained reference case. An equivalence ratio dip is observed in all simulations and it can serve as a marker for the premixed flame. The dip is attributed to the preferential diffusion of carbon- and hydrogen- containing species. Hysteresis of S_d is observed in the unsteady and unstrained laminar flames that propagate into normally stratified reactants. Stoichiometric flames propagating into lean mixture have a larger S_d than lean flames propagating into stoichiometric mixtures. The cross-dissipation term contribution to S_d is small (~~10%) but its contribution to the hysteresis of S_d is not (~~50%). Differential propagation of the flame surface is observed in the laminar flame that propagates into tangentially stratified reactants. Stretch on the flame surface is induced by the differential propagation, which in turn increases the flame surface area.
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Books on the topic "Premixed Combustion"

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Turbulent premixed flames. Cambridge: Cambridge University Press, 2011.

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Santavicca, D. A. Premixed turbulent flame propagation. University Park, PA: Pennsylvania State University, 1987.

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Green, James M. A premixed hydrogen/oxygen catalytic igniter. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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Chinitz, Wallace. Experimental requirements for the study of shock-induced premixed combustion. Washington, D. C: American Institute of Aeronautics and Astronautics, 1994.

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V, Bracco Frediano, ed. Two-dimensional visualization of premixed-charge flame structure in an IC engine. Warrendale, PA: Society of Automotive Engineers, 1987.

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Wong, Chung-Nin Channy. HECTR analyses of the Nevada Test Site (NTS) premixed combustion experiments. Washington, DC: Division of Systems Research, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1988.

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Mantzaras, John. Three-dimensional visualization of premixed-charge engine flames: Islands of reactants and products, fractal dimensions, and homogeneity. Warrendale, PA: Society of Automotive Engineers, 1988.

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Xie, Lin. Effects of jet strength on NOx formation in premixed impinging jet combustion with minimum heat losses. Tokyo, Japan: National Aerospace Laboratory, 1994.

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Nguyen, Hung Lee. Evaluation of a hybrid kinetics/mixing-controlled combustion model for turbulent premixed and diffusion combustion using KIVA-II. [Washington, DC: National Aeronautics and Space Administration, 1990.

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Herrmann, Marcus. Numerical simulation of premixed turbulent combustion based on a level set flamelet model. Aachen: Shaker, 2001.

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Book chapters on the topic "Premixed Combustion"

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Premixed Flames." In Combustion, 201–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-98027-5_14.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Laminar Premixed Flames." In Combustion, 111–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-98027-5_8.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Premixed Flames." In Combustion, 193–204. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-97668-1_14.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Laminar Premixed Flames." In Combustion, 107–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-97668-1_8.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Turbulent Premixed Flames." In Combustion, 201–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04508-4_14.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Laminar Premixed Flames." In Combustion, 111–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-662-04508-4_8.

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Date, Anil Waman. "Premixed Flames." In Analytic Combustion, 195–233. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1853-9_8.

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McAllister, Sara, Jyh-Yuan Chen, and A. Carlos Fernandez-Pello. "Premixed Flames." In Fundamentals of Combustion Processes, 111–37. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-7943-8_6.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Mathematical Description of Premixed Laminar Flat Flames." In Combustion, 23–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-98027-5_3.

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Warnatz, Jürgen, Ulrich Maas, and Robert W. Dibble. "Mathematical Description of Laminar Flat Premixed Flames." In Combustion, 21–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-97668-1_3.

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Conference papers on the topic "Premixed Combustion"

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Matalon, M. "Instabilities in non-premixed combustion." In 37th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-584.

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Noehre, Christof, Magnus Andersson, Bengt Johansson, and Anders Hultqvist. "Characterization of Partially Premixed Combustion." In Powertrain & Fluid Systems Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2006. http://dx.doi.org/10.4271/2006-01-3412.

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Dimitriu, Dan G., Mariusz Ziejewski, and Hans J. Goettler. "Apparatus for Premixed Combustion Analysis." In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1993. http://dx.doi.org/10.4271/932477.

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Arghode, Vaibhav, and Ashwani K. Gupta. "Non-Premixed and Premixed Colorless Distributed Combustion for Gas Turbine Application." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-38209.

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Non-premixed and premixed modes of Colorless Distributed Combustion (CDC) are investigated for application to gas turbine combustors. The CDC provides significant improvement in pattern factor, reduced NOx emission uniform thermal field in the entire combustion zone for it to be called as a isothermal reactor, and lower sound levels. Basic requirement for CDC is mixture preparation through good mixing between the combustion air and product gases so that the reactants are at much higher temperature to result in hot and diluted oxidant stream at temperatures that are high enough to auto-ignite the fuel and oxidant mixture. With desirable conditions one can achieve spontaneous ignition of the fuel with distributed combustion reactions. Distributed reactions can also be achieved in premixed mode of operation with sufficient entrainment of burned gases and faster turbulent mixing between the reactants. In the present investigation two non-premixed combustion modes and one premixed combustion mode that provide potential for CDC is examined. In all the configurations the air injection port is positioned at the opposite end of the combustor exit, whereas the location of fuel injection ports is changed to give different configurations. The results are compared for global flame signatures, exhaust emissions, acoustic signatures, and radical emissions using experiments and flow field, gas recirculation and mixing using numerical simulations. Ultra low NOx emissions are observed for both the premixed and non-premixed combustion modes, and almost colorless flames (no visible flame color) have been observed for the premixed combustion mode. The non-premixed mode was also provided near colorless distributed combustion. The reaction zone is observed to be significantly different in the two non-premixed modes.
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Lovett, Jeffery A., and Kevin T. Uznanski. "Prediction of Combustion Dynamics in a Staged Premixed Combustor." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30646.

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Combustion instabilities are a major challenge in the development of low-emissions premixed gas turbine combustors. The development and demonstration of predictive capabilities for instabilities has progressed considerably. One of the major fundamental mechanisms demonstrated in several instances is the convection of fuel concentration fluctuations from the fuel injector to the reaction zone. A one-dimensional model has been developed which captures this mechanism coupled to solutions for standing acoustic waves. Since many real combustion systems include multiple flow paths for mixing and/or staged fuel injection, the model has been extended to include a parallel acoustic path and two fuel injection locations. Splitting of fuel between two injection positions is a common method to influence combustion dynamics toward a more operable system. A relatively simple model which only partially couples acoustics and heat release was applied to an axially staged combustor and the predictions are compared with the experimental behavior. The results from this model successfully predict the overall dynamics behavior as a function of the fuel split between the two injection locations.
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Smith, Kenneth, and Anthony Fahme. "Back Side-Cooled Combustor Liner for Lean-Premixed Combustion." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-239.

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This paper describes the design and initial testing of a second generation, lean-premixed combustor for a 6100 horsepower industrial gas turbine. The full scale, prototype combustor liner employed augmented backside cooling (ABC) as a means of reducing NOx and CO emissions. A thermal barrier coating (TBC) was applied on the liner hot side to reduce thermal flux from the flame zone. The goal of the effort was to demonstrate that the avoidance of film-cooling for the combustor liner would allow emissions reductions in a lean-premixed combustion system. Testing of the combustor was conducted in both low and high pressure environments. The testing demonstrated that the use of trip-strips for backside cooling provides an effective means of reducing CO emissions. The lower CO levels can be exploited by lowering flame temperatures to achieve lower NOx emissions. Reaction quenching associated with film cooling is indicated as the cause of the higher CO emissions in more conventional liners. Cyclic rig testing showed the TBC to have good short-term durability. Long-term field testing is getting underway.
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Murota, Tomoya, and Masaya Ohtsuka. "Large-Eddy Simulation of Combustion Oscillation in Premixed Combustor." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-274.

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To analyze combustion oscillation in the premixed combustor, a large-eddy simulation program for premixed combustion flow was developed. The subgrid scale (SGS) model of eddy viscosity type for compressible turbulence (Speziale et al., 1988) was adopted to treat the SGS fluxes. The fractal flamelet model, which utilizes the fractal properties of the turbulent premixed flame to obtain the reaction rate, was developed. Premixed combustion without oscillation was analyzed to verify the present method. The computational results showed good accordance with experimental data (Rydén et al., 1993). The combustion oscillation of an “established buzz” type in the premixed combustor (Langhorne, 1988) was also analyzed. The present method succeeded in capturing the oscillation accurately. The detailed mechanism was investigated. The appearance of the non-heat release region, which is generated because the supply of the unburnt gas into the combustion zone stagnates, and its disappearance play an important role.
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Steele, Robert C., Luke H. Cowell, Steven M. Cannon, and Clifford E. Smith. "Passive Control of Combustion Instability in Lean Premixed Combustors." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-052.

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A Solar fuel injector that provides lean premixed combustion conditions has been studied in a combined experimental and numerical investigation. Lean premixed conditions can be accompanied by excessive combustion driven pressure oscillations which must be eliminated before the release of a final combustor design. In order to eliminate the pressure oscillations the location of fuel injection was parametrically evaluated to determine a stable configuration. It was observed that small axial changes in the position of the fuel spokes within the premix duct of the fuel injector had a significant positive effect on decoupling the excitation of the natural acoustic modes of the combustion system. In order to further understand the phenomenon, a time-accurate 2D CFD analysis was performed. 2D analysis was first calibrated using 3D steady-state CFD computations of the premixer in order to model the radial distribution of velocities in the pre mixer caused by non-uniform inlet conditions and swirling flow. 2D time-accurate calculations were then performed on the baseline configuration. The calculations captured the coupling of heat release with the combustor acoustics, which resulted in excessive pressure oscillations. When the axial location of the fuel injection was moved, the CFD analysis accurately captured the fuel time lag to the flame-front, and qualitatively matched the experimental findings.
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Koyama, Masamichi, Hiroshi Fujiwara, Laurent Zimmer, and Shigeru Tachibana. "Effects of Swirl Combination and Mixing Tube Geometry on Combustion Instabilities in a Premixed Combustor." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90891.

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In this paper, flow fields inside a premixed combustor have been investigated by CFD analysis and PIV measurement in a preheating, non-reacting condition. Four types of premixer are examined. The design of the premixer is determined by the combination of swirlers and mixing tubes. There are two variations of triple-concentric swirlers and three variations of mixing tubes. Comparisons are made among mean velocity distributions derived from CFD and PIV. PDF analysis is performed on the data from PIV to discuss the possibility of the occurrence of flashback. Combustion rig tests have been carried out also on similar condition to see combustion instabilities depending on the choice of premixers and operating conditions. Flame is directly observed from crystal windows placed on the side and downstream of the combustion chamber. A glass rod is installed on the wall of the mixing tube so as to see light emissions inside the tube, i.e. evidence of flashback. Pressure fluctuations at the combustor liner are measured in one position. The spectra of pressure fluctuations are computed to look at the possibility of combustion oscillations. Discussions are made on the relation between the global flame structure and pressure modes. Finally, proper premixer configurations to prevent combustion instabilities are proposed.
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Yang, Yao, Gaofeng Wang, Yuanqi Fang, Yifan Xia, and Liang Zhong. "Imaging Diagnositics of Combustion Instability in Premixed Swirling Combustion." In GPPS Beijing19. GPPS, 2019. http://dx.doi.org/10.33737/gpps19-bj-104.

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Reports on the topic "Premixed Combustion"

1

Libby, P. A. Premixed turbulent combustion. Office of Scientific and Technical Information (OSTI), January 1991. http://dx.doi.org/10.2172/6065676.

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2

Sivashinsky, G. I. Studies in premixed combustion. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/7305286.

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D. J. Seery. Lean Premixed Combustion/Active Control. US: United Technologies Corp, February 2000. http://dx.doi.org/10.2172/898338.

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Janus, M. C., and G. A. Richards. A model for premixed combustion oscillations. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/379049.

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Santavicca, Domenic A. Combustion Instabilities in Lean Premixed Combustors. Fort Belvoir, VA: Defense Technical Information Center, July 2001. http://dx.doi.org/10.21236/ada400629.

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Robert W. Pitz, Michael C. Drake, Todd D. Fansler, and Volker Sick. Partially-Premixed Flames in Internal Combustion Engines. Office of Scientific and Technical Information (OSTI), November 2003. http://dx.doi.org/10.2172/817088.

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Gouldin, F. C. Crossed-Plane Imaging of Premixed Turbulent Combustion Processes. Fort Belvoir, VA: Defense Technical Information Center, March 2003. http://dx.doi.org/10.21236/ada415774.

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Richards, G. A., R. S. Gemmen, and M. J. Yip. A test device for premixed gas turbine combustion oscillations. Office of Scientific and Technical Information (OSTI), March 1996. http://dx.doi.org/10.2172/379048.

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Gouldin, F. C. Support for Advanced Imaging of Premixed Turbulent Combustion Processes. Fort Belvoir, VA: Defense Technical Information Center, November 2004. http://dx.doi.org/10.21236/ada429927.

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10

Bourlioux, A. Analytical Validation of Flamelet-Based Models for Non-Premixed Turbulent Combustion. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada396374.

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