Academic literature on the topic 'Parallel jet burner'
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Journal articles on the topic "Parallel jet burner"
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SZEGO, G., B. DALLY, and G. NATHAN. "Operational characteristics of a parallel jet MILD combustion burner system." Combustion and Flame 156, no. 2 (February 2009): 429–38. http://dx.doi.org/10.1016/j.combustflame.2008.08.009.
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Mi, Jianchun, Pengfei Li, and Chuguang Zheng. "Impact of injection conditions on flame characteristics from a parallel multi-jet burner." Energy 36, no. 11 (November 2011): 6583–95. http://dx.doi.org/10.1016/j.energy.2011.09.003.
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NADA, Yuzuru, Takahiro ITO, and Susumu NODA. "Effects of Burned Gas Dilution on the Ignition Delay Time of High Temperature Air Combustion with a Parallel Jet Burner." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78, no. 789 (2012): 1127–42. http://dx.doi.org/10.1299/kikaib.78.1127.
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Cheong, Kin-Pang, Guochang Wang, Bo Wang, Rong Zhu, Wei Ren, and Jianchun Mi. "Stability and emission characteristics of nonpremixed MILD combustion from a parallel-jet burner in a cylindrical furnace." Energy 170 (March 2019): 1181–90. http://dx.doi.org/10.1016/j.energy.2018.12.146.
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MATSUMOTO, Masayuki, Nobuyoshi TAKAHASHI, Kazuya SUGIYAMA, Yuzuru NADA, and Yoshiyuki KIDOGUCHI. "713 Effect of Nozzle Distance on NOx Emissions from High Temperature Air Spray Combustion Incorporating with a Parallel Jet Burner." Proceedings of Conference of Chugoku-Shikoku Branch 2016.54 (2016): _713–1_—_713–2_. http://dx.doi.org/10.1299/jsmecs.2016.54._713-1_.
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Elangovan, S., A. Solaiappan, and E. Rathakrishnan. "Studies on Twin Non-Parallel Unventilated Axisymmetric Jets." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 210, no. 4 (October 1996): 309–21. http://dx.doi.org/10.1243/pime_proc_1996_210_376_02.
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Twin non-parallel jet configurations occur in many practical devices like burners, combustion chambers, and also in the area of fluidics etc. Despite the importance of such configurations, studies on the interaction of twin non-parallel jets are very limited. The present work is an attempt to investigate the mixing of two axisymmetric jets obliquely oriented towards each other. Experimental studies were made on the interaction of twin intersecting axisymmetric jets issuing from two unventilated convergent nozzles. The nozzles of exit diameter (D) 10 mm were set on a common end wall with their axes intersecting each other at half angles (α3) of 0°, 5°, 10° and 15°. The centre-to-centre spacing (S) of the nozzles, non-dimensionalized, as S/D, was 3.1. The jet exit Mach number (Me) studied was 0.2. The results indicate that the near field characteristics are strongly influenced by α3. However, the potential core of the individual jets and the far field characteristics of the twin jet flow field, that is beyond downstream distances of 40 nozzle diameters, are not significantly influenced by α3. The cross-section of the jet just downstream of the combining point is approximately elliptic. The axis switching phenomenon normally associated with non-circular jets is observed in the jet flow field. The spread of the combined jet is more in the transverse direction than in the spanwise direction. Entrainment of the ambient fluid is found to be more in the case of twin parallel jets (α3 = 0°). The entrainment decreases with increasing α3. The self-preserving nature of the combined jet is almost independent of the initial geometric conditions. The combined jet is axisymmetric with regard to the normalized velocity and length scales.
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Fraix-Burnet, D. "Oblique Shocks in Extragalactic Jets." Symposium - International Astronomical Union 140 (1990): 437. http://dx.doi.org/10.1017/s0074180900190746.
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In the framework of the diffusive shock acceleration of relativistic electrons in extragalactic jets, we show that it is possible to derive the speed of the jet. For this purpose, we transform continuity relations through an oblique shock front into the reference frame of the observer. We apply these calculations to knot A of the M87 jet. Measuring the deviation of the fluid through the shock front from high-resolution radio maps and the deviation of the magnetic field from optical polarization maps (Fraix-Burnet et al., 1989), we derive speeds of about 0.01 c (Fraix-Burnet and Biermann, in preparation). The compression ratio is most probably 4 and the magnetic field is nearly parallel to the shock front both upstream and downstream.
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Nieckele, Angela O., Mo^nica F. Naccache, and Marcos S. P. Gomes. "Numerical Modeling of an Industrial Aluminum Melting Furnace." Journal of Energy Resources Technology 126, no. 1 (March 1, 2004): 72–81. http://dx.doi.org/10.1115/1.1625396.
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For the present work, a numerical simulation of the 100% oxy-firing combustion process inside an industrial aluminum remelting reverb furnace is presented. Three different configurations were analyzed: (i) a staged combustion process with parallel injection jets for oxygen and natural gas, (ii) a staged combustion process with a divergent jet for the oxygen, and (iii) a non-staged combustion process, with parallel jets. In all the cases, the injections were directed towards the aluminum bath, which was maintained at constant temperature. The numerical procedure was based on the finite volume formulation. The κ-ε model of turbulence was selected for simulating the turbulent flow field. The combustion process was calculated based on the finite rate models of Arrhenius and Magnussen, and the Discrete Transfer Radiation model was employed for predicting the radiation heat transfer. The numerical predictions allowed the determination of the flame patterns, species concentration distribution, temperature and velocity fields. This kind of analysis can be a powerful tool for evaluating design options such as the type, number and positioning of the burners. The present work illustrates a preliminary comparison of three types of burners. From the results obtained, the staged combustion process with a divergent jet presented the best configuration, since the flame length was not too long as to damage the refractory wall. Further it presented the largest region with low water vapor concentration close to the aluminum surface.
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Perret, Gaële, Thomas Dubos, and Alexandre Stegner. "How Large-Scale and Cyclogeostrophic Barotropic Instabilities Favor the Formation of Anticyclonic Vortices in the Ocean." Journal of Physical Oceanography 41, no. 2 (February 1, 2011): 303–28. http://dx.doi.org/10.1175/2010jpo4362.1.
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Abstract Large-scale vortices, that is, eddies whose characteristic length scale is larger than the local Rossby radius of deformation Rd, are ubiquitous in the oceans, with anticyclonic vortices more prevalent than cyclonic ones. Stability or robustness properties of already formed shallow-water vortices have been investigated to explain this cyclone–anticyclone asymmetry. Here the focus is on possible asymmetries during the generation of vortices through barotropic instability of a parallel flow. The initial stage and the nonlinear stage of the instability are studied by means of linear stability analysis and direct numerical simulations of the one-layer rotating shallow-water equations, respectively. A wide variety of parallel flows are studied: isolated shears, the Bickley jet, and a family of wakes obtained by combining two shears of opposite signs. The results show that, when the flow is characterized by finite relative isopycnal deviation, the barotropic instability favors the formation of large-scale anticyclonic eddies. The authors emphasize here that the cyclone–anticyclone asymmetry of parallel flows may appear at the linear stage of the instability. This asymmetry finds its origin in the linear stability property of localized shear flows. Indeed, for both the cyclogeostrophic regime (finite Rossby number) and the frontal geostrophic regime (small Burger number), an anticyclonic shear flow has higher linear growth rates than an equivalent cyclonic shear flow. The nonlinear saturation then leads to the formation of almost axisymmetric anticyclones, while the cyclones tend to be more elongated in the shear direction. However, although some unstable parallel flows exhibit the asymmetry at the linear stage, others exhibit such asymmetry at the nonlinear stage only. If the distance separating two shear regions is large enough, the barotropic instability develops independently in each shear, leading in the frontal and the cyclogeostrophic regime to a significant cyclone–anticyclone asymmetry at the linear stage. Conversely, if the two shear regions are close to each other, the shears tend to be coupled at the linear stage. The most unstable perturbation then resembles the sinuous mode of the Bickley jet, making no distinction between regions of cyclonic or anticyclonic vorticity. Nevertheless, when the nonlinear saturation occurs, large-scale anticyclones tend to be axisymmetric while the cyclonic structures are highly distorted and elongated along the jet meander.
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Schaible, Ulrich E., Helen L. Collins, Friedrich Priem, and Stefan H. E. Kaufmann. "Correction of the Iron Overload Defect in β-2-Microglobulin Knockout Mice by Lactoferrin Abolishes Their Increased Susceptibility to Tuberculosis." Journal of Experimental Medicine 196, no. 11 (November 25, 2002): 1507–13. http://dx.doi.org/10.1084/jem.20020897.
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As a resident of early endosomal phagosomes, Mycobacterium tuberculosis is connected to the iron uptake system of the host macrophage. β-2-microglobulin (β2m) knockout (KO) mice are more susceptible to tuberculosis than wild-type mice, which is generally taken as a proof for the role of major histocompatibility complex class I (MHC-I)–restricted CD8 T cells in protection against M. tuberculosis. However, β2m associates with a number of MHC-I–like proteins, including HFE. This protein regulates transferrin receptor mediated iron uptake and mutations in its gene cause hereditary iron overload (hemochromatosis). Accordingly, β2m-deficient mice suffer from tissue iron overload. Here, we show that modulating the extracellular iron pool in β2m–KO mice by lactoferrin treatment significantly reduces the burden of M. tuberculosis to numbers comparable to those observed in MHC class I–KO mice. In parallel, the generation of nitric oxide impaired in β2m–KO mice was rescued. Conversely, iron overload in the immunocompetent host exacerbated disease. Consistent with this, iron deprivation in infected resting macrophages was detrimental for intracellular mycobacteria. Our data establish: (a) defective iron metabolism explains the increased susceptibility of β2m-KO mice over MHC-I–KO mice, and (b) iron overload represents an exacerbating cofactor for tuberculosis.
Dissertations / Theses on the topic "Parallel jet burner"
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Szego, George Gabriel. "Experimental and numerical investigation of a parallel jet MILD combustion burner system in a laboratory-scale furnace." Thesis, 2010. http://hdl.handle.net/2440/64813.
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In a world increasingly concerned with fuel prices, sustainability and the environment, energy efficiency improvements are indispensable. In this framework, Moderate or Intense Low-oxygen Dilution (MILD) combustion technology can
play a significant role in the mitigation of combustion-generated pollutants and greenhouse gases, whilst meeting thermal efficiency needs. Under MILD conditions, reactants are highly diluted with combustion products causing reactions to occur in a distributed reaction zone with a reduced peak temperature. As a consequence, the temperature distribution is nearly uniform, and pollutant emissions, nitrogen oxides (NOx) in particular, are lower than from conventional flames. Over the past few decades, MILD combustion technology has been implemented
at full scale in various industrial sectors and tested at pilot scale in other applications. Nevertheless, despite considerable industrial success, many important issues of MILD combustion remain unresolved. The current research seeks to characterise the MILD regime in a furnace environment burning gaseous fuels through a combined experimental and numerical modelling approach. This study describes the performance and stability characteristics of a parallel jet MILD combustion burner system in a laboratory-scale furnace, in which the reactants and exhaust ports are all mounted on the same wall. In-furnace temperatures and global emissions are measured, respectively with fine-wire thermocouples and a gas analyser, for a wide range of operating conditions. In addition, velocities for selected cases are measured using laser Doppler anemometry (LDA). The detailed experimental data set is then used to validate a computational fluid dynamics (CFD) model. In combination, the experimental and numerical data reveal details of the passive and reactive scalar fields, and enable not only the investigation of the parameters that influence their structure and pollutant formation, but also insight into the contribution of flue gas recirculation to flame stability under MILD conditions. The present furnace/burner configuration proved to operate without the need for external air preheating, and achieved a high degree of temperature uniformity. The analysis of the furnace aerodynamics and qualitative observations of the burner exit region revealed that effective mixing is essential in order to increase dilution before reaction to ensure stability of this multiple jet system. Unlike in previous investigations, the fuel jet momentum is found to control the stability of this multiple jet system. The CO formation is found to be related to the mixing patterns and furnace temperature rather than reaction quenching by the heat exchanger. It is found that, although heat extraction, air preheat, excess air, firing rate, dilution, and fuel type all affect NOx emissions, they do not control NOx scaling. The combined effects of these global parameters can be ultimately characterized by a furnace temperature and a global residence time. The quantitative analysis of NOx emissions demonstrated the nondominant role of the thermal-NO pathway in the present MILD combustion conditions. It has been revealed that the N2O-intermediate pathway is the dominant NOx formation mechanism, while the prompt-NO mechanism is negligible. There is potential for NO reburning for this parallel jet burner configuration. Despite the complexity of the recirculating flow inside the furnace, the CFD model agrees reasonably well with the experimental data. It is noted from the CFD analysis that finite-rate chemistry must be included for accurate predictions of MILD combustion conditions. The fundamental aspects revealed by this study provide unique advancements in the understanding of MILD combustion that will assist in the effort to extend this technology to other heat and power systems.Thesis (Ph.D.) -- University of Adelaide, School of Mechanical Engineering, 2010
Conference papers on the topic "Parallel jet burner"
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Nada, Yuzuru, Yasutomo Zenman, Takahiro Ito, and Susumu Noda. "The Effect of Distance Between Fuel and Oxidizer Nozzles on NOx Emission From High Temperature Air Combustion." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44216.
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This study describes NOx emission characteristics of a high temperature air combustion furnace operating with parallel jet burner system. In the parallel jet burner system, fuel nozzles are separated with a distance from an oxidizer nozzle. Objectives of this study are to clarify the effect of the distance between the fuel nozzle and the oxidizer nozzle on NOx emission. The emission index of NOx (EINOx) decreases with the increase in the distance. This is due to the dilution through entrainment of burned gas. A scaling concept is proposed to assess the dilution effect on the NOx emission. Scaling parameters employed here are the global residence time of fuel and the flame temperature evaluated on a modified flamelet model in which the dilution effect is included. The overall EINOx production rate is scaled with the flame temperature. This scaling indicates the importance of the distance between the nozzles for NOx emission.
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Nieckele, Angela O., Mônica F. Naccache, Marcos S. P. Gomes, and William T. Kobayashi. "The Influence of Oxygen Injection Configuration in the Performance of an Aluminum Melting Furnace." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1052.
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Abstract In the present work, a numerical simulation of the 100% oxy-firing combustion process inside an industrial Aluminum Remelting Reverb Furnace is presented. A staged combustion oxy-fuel burner is being simulated. The natural gas and oxygen were injected toward the aluminum bath, which was considered as an isotherm wall at melt temperature. Two types of burners are compared. For the first case, the oxygen and natural gas jets at the burner exit are parallel to each other, while for the second burner, a divergent oxygen jet is employed. The furnace heat loss to the ambient is neglected since it is small in relation to the heat liberated by the combustion process. The k-ε model of turbulence was selected to represent the turbulent flow field. The combustion process was determined based on the Arrhenius and Magnussen Laws, and the discrete transfer radiation model was employed to predict the radiation heat transfer. The numerical procedure was based on the Finite Volume Method. This numerical model is utilized to determine the flame pattern, species concentration distribution, and the velocity field. The temperature distribution is very useful in the evaluation of the furnace performance. Further, critical regions associated with high temperature spots at the refractory surface were discovered. The effect of the divergent jet in the heat flux distribution at the aluminum bath is also investigated.
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Sawyer, Mikel L., Aly H. Shaaban, and Reza Salavani. "A Minichannel Heat Exchanger System for Heating, Boiling, and Superheating Water by Radiant Combustion." In ASME 2004 Heat Transfer/Fluids Engineering Summer Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ht-fed2004-56582.
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A minichannel steam generator is being developed for a fuel reformer. The reformer will convert jet fuel to a hydrogen-rich stream for a 10 kW fuel cell. A first model has been built and tested. It was a once-through design with of two sequential heat exchangers. Exhaust gases produced saturated liquid in the first unit. The second surrounded a radiant propane burner. The system heated 1.2 to 2.6 gm/s of de-ionized water to more than 650 °C at exit pressures from 106 to 240 kPa. These flows and temperatures meet the requirements for the 10 kW fuel reformer. The minichannel system operated across three regimes: liquid heating, boiling, and superheating. It used multiple channels in parallel. At certain locations, the number of the parallel channels was changed to restrain the total pressure drop. The channel hydraulic diameter was 0.14 cm. The Reynolds number for the water ranged from 620 to 1,260 in the boiling section and from 1,260 to 3,140 in the superheating section, based on averaged fluid properties. The total pressure drop in the heat exchanger pair ranged from 470 to 870 kPa. The water absorbed heat fluxes ranging from 0.3 to 1.2 W/cm2 in the single-phase regions and 4.7 to 9.8 W/cm2 in the boiling region. These values were based on the wetted wall area. The boiling data falls in the range of published results for similar mass flux. An increased capacity for absorbing heat flux was demonstrated as coolant mass flux or Reynolds number increased. This paper also discusses the reasons for calculating heat flux based on heated area and based on wetted channel area. The need to identify clearly the basis of heat flux is addressed.
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Zuo, Baifang, David L. Black, and Clifford E. Smith. "A New Assumed PDF Turbulent Combustion Model for Multi-Step Chemistry." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68133.
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The effect of turbulence on chemical reactions is known to be important in many gas turbine combustor applications. There are only a few established models that can capture turbulence-combustion interaction in CFD codes, and all of these models are either very expensive (e.g. Monte Carlo PDF model) or limited in what types of flames can be analyzed (e.g. laminar flamelet). Assumed PDF models have been a popular choice because they are inexpensive and can handle all flame types (e.g. diffusion, premixed and partially premixed). However, assumed PDF models are typically restricted to single, one-step global mechanisms; or are a function of species and quickly become computationally expensive. CFD Research Corporation has recently developed and validated a new assumed PDF turbulence chemistry interaction model for multi-step chemistry. The model adopts an assumed, two-variable joint-PDF to model a wide-range of turbulent reacting flows. The two variables defining the PDF are the mixture fraction and reaction progress, representing species diffusion and flame propagation. A significant advantage of this new approach is its wide range of applicability for premixed, diffusion, and partially premixed flames. Allowing more detailed chemistry for species and combustion predictions enables complex chemical reaction processes including pollutant formation, flame ignition, and flame quenching to be studied. The model is also computationally efficient, with only a minor increase in computational expense with either species or number of global reaction steps. The newly developed model was first validated using a diffusion flame from a piloted burner developed at the University of Sydney. Three different methane bulk jet velocities were used to investigate the model’s behavior on turbulent diffusion flames. Simulation data were compared with the experimental measurements and the simulation results performed by Pope (Masri and Pope, 1990) using a velocity-composition joint PDF transport equation solved by the Monte Carlo method. To validate the model on premixed flames, the data of Moreau et al. (Moreau et al., 1974, 1976, 1977) were used. Data were collected on a mixing layer stabilized burner, where the main flow into the combustor was a premixed mixture of methane and air. Parallel to the main stream, a pilot stream of hot combustion products at 2000 K was injected for flame stabilization. The results demonstrate the wide applicability of the new model for practical, turbulent combustion applications.
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Chandh, Aravind, Shivam Patel, Oleksandr Bibik, Subodh Adhikari, David Wu, Reza Rezvani, Dustin Davis, Tim Lieuwen, and Benjamin Emerson. "High Speed OH PLIF Measurements of Combustor Effusion Films in a High Pressure, Liquid Fueled Combustor." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59306.
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Abstract This paper presents measurements of 10 kHz OH planar laser induced fluorescence (PLIF) with an objective to study the interaction of effusion cooling with the flame and hot combustion products in the liquid fueled combustor. The combustor rig is a single sector representation a rich-burn/quick-quench/lean-burn (RQL) configuration. It consists of a swirl nozzle, dilution, and effusion jets. The rig is operated under realistic aircraft conditions, including elevated combustor inlet temperature, and elevated pressure. The PLIF laser sheet was arranged perpendicular and parallel to the liner at distinct liner locations. Parametric variations of important parameters, namely equivalence ratio, and effusion cooling air blowing ratio are conducted to investigate their effect on flame-effusion jet interactions. The PLIF images were analyzed using several data reduction techniques to de-noise the images and identify patterns in the effusion jet-flame interactions. Results show that the effusion jets are highly unsteady, interacting strongly with the turbulent flame from the swirl nozzle and the dilution jets. This work is an extension of recent effusion film mixing studies that were performed with acetone PLIF under non-reacting conditions.
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Chandh, Aravind, Askar Kazbekov, Angie Zhang, Subodh Adhikari, David Wu, Ben Emerson, Reza Rezvani, William Proscia, Tim Lieuwen, and Adam Steinberg. "Dynamics of Effusion Cooling Fluid in a Pressurized Swirl Combustor Flow." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15939.
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Abstract This paper presents measurements of 10 kHz acetone planar laser induced fluorescence (PLIF) to study the behavior of effusion cooling fluid injected into a non-reacting gas turbine combustor flow at elevated pressure. This study was performed as part of a larger effort to understand potential interactions of the swirling flame with the cooling air. The combustor — which was representative of a rich-burn/quick-quench/lean-burn (RQL) configuration — consisted of a swirl nozzle, quench jets, and a modular liner that could be fitted with various effusion cooling panels and optical access windows. Primary air was seeded with acetone, and passed through the swirl nozzle. Unseeded secondary air was passed on the outside of the liner, entering the combustion chamber through the quench jets and effusion panels. The PLIF laser sheet was arranged parallel to the effusion panel at various offset distances to visualize the mixing between the core flow and effusion jets. The PLIF images were analyzed with a POD-based methodology to de-noise the images and identify patterns in the effusion jet characteristics. The results show that high blowing ratios produce individual effusion jets rather than a single, coalesced film. The effusion jets are highly unsteady, interacting strongly with the turbulent flow from the swirl nozzle and dilution jets. Furthermore, the average trajectories of effusion jets are non-uniform across the panel and are shaped by upstream features in the combustor, namely swirl and dilution jets.
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Ahrens, Denise, Michael Kolb, Christoph Hirsch, and Thomas Sattelmayer. "NOx Formation in a Reacting Premixed Jet in Hot Cross Flow." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26139.
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The NOx emissions of a premixed jet in hot cross flow configuration have been studied experimentally and with simple Cantera models. Staged combustion is realized by a first reaction zone providing a flow of fully combusted products and a secondary combustion stage downstream which consists of a premixed jet injected into the hot cross flow. The focus of the study lies on the overall NOx emission reduction potential of this generic configuration with respect to single stage premixed combustion employed in the high load regime of most large gas turbines for power generation. Cantera benchmark calculations were made to address that question. The second stage reaction was modeled using two different configurations: The worst case scenario being the combustion of the mixture in the jet without any interaction with the hot cross flow, and the most favorable case being the jet and the cross flows perfectly mixed and then burned. All calculations were performed under atmospheric and high pressure conditions to illustrate the influence of pressure on the potential of staging on the reduction of NOx emissions. In parallel to the modeling the NOx formation was studied in an atmospheric test rig. For that purpose emission and temperature data were collected with single orifice probe traverses four jet diameters downstream. The thermocouple probe was calibrated against CO-equilibrium concentration data from thermodynamic modeling. Furthermore, a planar laser diagnostic technique using Mie scattering was applied for determining the mixing of jet and cross flow. The mixture field was statistically analyzed to detect differences in spatial and temporal mixing. Finally all data were used to study NOx formation under atmospheric pressure and to transfer the results to gas turbine combustor conditions.
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Chander, Subhash, and Anjan Ray. "Investigation of Flame Structure for Laminar Methane/Air Flame Impinging on a Flat Surface." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88195.
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A combined experimental and numerical study has been conducted to investigate the impinging flame structure. Inflame temperature profiles were obtained and compared with corresponding simulated profiles. For detailed understanding of flame structure numerical simulations were carried out using commercial CFD code FLUENT. Simulated temperature, heat flux and species profiles were analyzed. Further investigations were done by plotting streamlines, velocity magnitude profiles and species profiles. It has been seen that bulk of the combustion products were burnt rapidly in the narrow reaction zone at the tip of the flame. This was because of exponential relationship between the chemical reaction rate and temperature. Simulation results show high temperature in the region between the inner premixed and the outer non-premixed (diffusion) reaction zones. The burnt gas along the inner zone expands and molecules change their directions from initially parallel to diverging lines. Flow accelerated from stagnation point and attained maximum velocity at the start of wall-jet region.