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Letteratura scientifica selezionata sul tema "Accelerated Flames"

Autore: Grafiati

Pubblicato: 12 ottobre 2024

Ultima modifica: 31 luglio 2025

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Articoli di riviste sul tema "Accelerated Flames"

Lou, Bo, Yonghai Qiu, and Jianhong Xu. "Characteristics of diffusion flames with accelerated motion." Thermal Science 20, no. 6 (2016): 2113–24. http://dx.doi.org/10.2298/tsci150413180l.

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The aim of this work is to present an experiment to study the characteristics of a laminar diffusion flame under acceleration. A Bunsen burner (nozzle diameter 8 mm), using liquefied petroleum gas as its fuel, was ignited under acceleration. The temperature field and the diffusion flame angle of inclination were visualised with the assistance of the visual display technology incorporated in MATLAB?. Results show that the 2-d temperature field under different accelerations matched the variation in average temperatures: they both experience three variations at different time and velocity stages.

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Zhu, Yuejin, Lei Yu, Gang Dong, Jianfeng Pan, and Zhenhua Pan. "Flow Topology of Three-Dimensional Spherical Flame in Shock Accelerated Flows." Advances in Materials Science and Engineering 2016 (2016): 1–12. http://dx.doi.org/10.1155/2016/3158091.

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The flow topologies of compressible large-scale distorted flames are studied by means of the analysis of the invariants of the velocity gradient tensor (VGT). The results indicate that compressibility plays a minor role in the distorted flame zone. And the joint probability density function (p.d.f.) of the Q-R diagram appears as a teardrop shape, which is a universal feature of turbulence. Therefore, the distorted flame exhibits the characteristic of large-scale turbulence combustion, especially behind the reflected shock wave, while the p.d.f. of the QS⁎-QW diagram implies that the dissipatio

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Dunn-Rankin, D., and M. A. McCann. "Overpressures from nondetonating, baffle-accelerated turbulent flames in tubes." Combustion and Flame 120, no. 4 (2000): 504–14. http://dx.doi.org/10.1016/s0010-2180(99)00109-1.

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Boettcher, Philipp A., Shyam K. Menon, Brian L. Ventura, Guillaume Blanquart, and Joseph E. Shepherd. "Cyclic flame propagation in premixed combustion." Journal of Fluid Mechanics 735 (October 23, 2013): 176–202. http://dx.doi.org/10.1017/jfm.2013.495.

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AbstractIn experiments of hot surface ignition and subsequent flame propagation, a puffing flame instability is observed in mixtures that are stagnant and premixed prior to ignition. By varying the size of the hot surface, power input, and combustion vessel volume, it was determined that the instability is a function of the interaction of the flame, with the fluid flow induced by the combustion products rather than the initial plume established by the hot surface. Pressure ranges from 25 to 100 kPa and mixtures of n-hexane/air with equivalence ratios between $\phi = 0. 58$ and 3.0 at room temp

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Kiverin, Alexey, Alexey Tyurnin, and Ivan Yakovenko. "On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures." Materials 16, no. 7 (2023): 2813. http://dx.doi.org/10.3390/ma16072813.

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The paper presents a novel numerical approach to the quantitative estimation of the concentration limits for flame acceleration in hydrogen-based mixtures. A series of calculations are carried out for hydrogen–air and hydrogen–oxygen flames in channels. The analysis of the obtained numerical results provided the value of 11 ± 0.25 % hydrogen content in the mixture as a lean concentration limit of flame acceleration that agrees well with the available experimental data. Moreover, the basic physical mechanism responsible for the transition from the steady mode of flame propagation to the acceler

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Xu, Cong, Junguang Lin, Zhihua Wang, Kaidi Wan, Shien Sun, and Zhijun Zhou. "Three-Dimensional Direct Numerical Simulation of Near-Field Ozone-Enhanced Lean Premixed Syngas Turbulent Jet Flame." Energies 15, no. 11 (2022): 3945. http://dx.doi.org/10.3390/en15113945.

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Due to its enhancement in the flame speed, ozone added in lean premixed syngas turbulent jet flame was investigated by the three-dimensional direct numerical simulation method in the near field of the flame. In the present study, numerical simulations were conducted in the lean premixed syngas turbulent jet flame configuration to explore the effects of ozone addition on freely-propagating turbulent flames. It was seen that turbulence began to significantly affect the flame surface to produce wrinkles in lean premixed gas flame with ozone added after 4D; ozone started to affect the composition

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Di Sarli, V., A. Di Benedetto, G. Russo, S. Jarvis, E. J. Long, and G. K. Hargrave. "Large Eddy Simulation and PIV Measurements of Unsteady Premixed Flames Accelerated by Obstacles." Flow, Turbulence and Combustion 83, no. 2 (2009): 227–50. http://dx.doi.org/10.1007/s10494-008-9198-3.

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Zhang, Xiaoliang, Shibing Kuang, Yanli Zhao, Jun Zhang, and Shengfeng Luo. "Experimental Investigation and Theoretical Analysis of Flame Spread Dynamics over Discrete Thermally Thin Fuels with Various Inclination Angles and Gap Sizes." Fire 7, no. 6 (2024): 177. http://dx.doi.org/10.3390/fire7060177.

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Flame spread over discrete fuels is a typical phenomenon in fire scenes. Experimental and theoretical research on flame spread over discrete thermally thin fuels separated by air gaps with different inclination angles was conducted in the present study. Experiments with six inclination angles ranging from 0° to 85° and various fuel coverage rates from 0.421 to 1 were designed. The flame spread behavior, the characteristic flame size, and the flame spread rate were analyzed. The results show that the flow pattern, stability, and flame size exhibit different characteristics with different inclin

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Schneider, F. R. N., O. H. Ramírez-Agudelo, F. Tramper, et al. "The VLT-FLAMES Tarantula Survey." Astronomy & Astrophysics 618 (October 2018): A73. http://dx.doi.org/10.1051/0004-6361/201833433.

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The 30 Doradus (30 Dor) nebula in the Large Magellanic Cloud (LMC) is the brightest HII region in the Local Group and a prototype starburst similar to those found in high redshift galaxies. It is thus a stepping stone to understand the complex formation processes of stars in starburst regions across the Universe. Here, we have studied the formation history of massive stars in 30 Dor using masses and ages derived for 452 mainly OB stars from the spectroscopic VLT-FLAMES Tarantula Survey (VFTS). We find that stars of all ages and masses are scattered throughout 30 Dor. This is remarkable because

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Hamed, AM, AE Hussin, MM Kamal, and AR Elbaz. "Combustion of a hydrogen jet normal to multiple pairs of opposing methane–air mixtures." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 231, no. 2 (2017): 145–58. http://dx.doi.org/10.1177/0957650916685944.

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The combustion performance of a cylindrical burner accommodating up to six multiple pairs of opposing methane–air mixtures with a cross-flow of hydrogen was addressed. The cross-flow initially duplicated the stagnation impact and enriched the vortical structures. Aided by the resulting flow strain, the transport of heat and active species from the hydrogen oxidation zone to the methane reaction zones accelerated the combustion across the opposing premixed flames and reduced the peak temperature across the outer diffusion flame. Increasing the cross-flow/opposing jets’ velocity ratio to 0.89 me

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Più fonti

Tesi sul tema "Accelerated Flames"

Vastier, Laura. "Étude de la propagation de flamme dans une atmosphère gazeuse représentative de la phase tardive d'un accident grave dans un REP." Electronic Thesis or Diss., Orléans, 2024. http://www.theses.fr/2024ORLE1020.

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La France possède aujourd'hui 58 réacteurs nucléaires qui permettent de fournir trois quarts de l'énergie nécessaire au bon fonctionnement de la vie quotidienne de ses 67 millions d'habitants. Cependant, cette source d'énergie n'est pas exempte d'incidents ou d'accidents, dont la gravité est classée dans ce que l'on appelle l'échelle INES (International Nuclear Event Scale).Dans le contexte de l'étude des accidents graves des réacteurs refroidis à l'eau, le risque hydrogène est défini comme la possibilité d'une perte de l'intégrité du confinement du réacteur ou de ses systèmes de sûreté à la s

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Libri sul tema "Accelerated Flames"

Chuck, C. Combusting flow simulations of detonation and shock-induced combustion waves for ram accelerator configurations with viscous effect. American Institute of Aeronautics and Astronautics, 1991.

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Henning, Harald Martin Jakob. The influence of the heliospheric current sheet and angular separation on flare accelerated solar wind. Center for Space Science and Astrophysics, Stanford University, 1985.

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J, Murphy R., and United States. National Aeronautics and Space Administration., eds. ⁷Li and ⁷Be deexcitation lines: Probes for accelerated particle transport models in solar flares. National Aeronautics and Space Administration, 1991.

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United States. National Aeronautics and Space Administration., ed. Determination of solar flare accelerated ion angular distributions from SMM gamma-ray and neutron measurements and Determination of the ³He/H ratio in the solar photosphere from SMM gamma-ray measurements: Final technical report, NASA grant NAG 5-945 (07/01/87 to 08/31/89). National Aeronautics and Space Administration, 1990.

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Office, General Accounting. Department of Energy: Accelerated closure of Rocky Flats : status and obstacles : report to the Chairman, Committee on Armed Services, U.S. Senate. The Office, 1999.

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Mody, Ashoka. Epilogue. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199351381.003.0012.

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This concluding chapter argues that the EuroTragedy was that critics—outsiders and insiders—warned of the euro's economic flaws and the likely political damage it could do. Wrapped in an obsessive groupthink, European leaders portrayed the single currency as a “pro-European” enterprise. However, the euro delivered none of the economic benefits promised. Some analysts had predicted that the euro would cause the share of trade between Eurozone countries to increase; instead, even before the global crisis had started in 2007, the share of within-Eurozone trade had started declining and that tende

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Determination of solar flare accelerated ion angular distributions from SMM gamma-ray and neutron measurements and Determination of the ³He/H ratio in the solar photosphere from SMM gamma-ray measurements: Final technical report, NASA grant NAG 5-945 (07/01/87 to 08/31/89). National Aeronautics and Space Administration, 1990.

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Capitoli di libri sul tema "Accelerated Flames"

Uchida, Shu. "Georgia as a Case Study of EU Influence, and How Russia Accelerated EU-Russian relations." In Managing Security Threats along the EU’s Eastern Flanks. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-26937-1_6.

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Reames, Donald V. "Distinguishing the Sources." In Solar Energetic Particles. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66402-2_3.

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AbstractOur discussion of history has covered many of the observations that have led to the ideas of acceleration by shock waves or by magnetic reconnection in gradual and impulsive solar energetic particle (SEP) events, respectively. We now present other compelling observations, including onset timing, SEP-shock correlations, injection time profiles, high-energy spectral knees, e/p ratios, and intensity dropouts caused by a compact source, that have helped clarify these acceleration mechanisms and sources. However, some of the newest evidence now comes from source-plasma temperatures. In this

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Fullstone, Gavin. "Rapid Particle-Based Simulations of Cellular Signalling with the FLAME-Accelerated Signalling Tool (FaST) and GPUs." In Methods in Molecular Biology. Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-3008-2_9.

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Jackson, Rowan, Steven Hartman, Benjamin Trump, et al. "Disjunctures of Practice and the Problems of Collapse." In Perspectives on Public Policy in Societal-Environmental Crises. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94137-6_7.

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AbstractThis chapter asks what insights long-term historical information from before the Great Acceleration and Anthropocene might offer to policy and practice in the twenty-first century. Conventional sustainability research usually focuses on shallower time horizons that could miss insightful environmental and social processes evolving over centuries to millennia. Although we push for increased engagement with historical researchers, parallels between pre-modern and contemporary environmental and societal challenges need to be treated with caution. So-called cases of societal collapse—often

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Bellantoni, Christina. "The End of the Institutionalist." In Disruption? Oxford University PressNew York, 2024. http://dx.doi.org/10.1093/oso/9780197767832.003.0013.

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Abstract Donald Trump’s presidency accelerated what had been slowly happening in the Senate. People from both parties who had been willing to work together had increasingly less incentive to do so, even institutionalists who had always revered traditions and decorum over combative politics. At the same time, the Washington ecosystem and especially the news media did nothing but fan the flames. Using a mix of first-person narrative and reporting, this chapter explores the concept of moderation in the Senate, which among Republicans simply came to translate as “not Trump.” The Senate continued o

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Ostrer, Harry. "Accelerated Rates of Mutation." In Non-Mendelian Genetics in Humans. Oxford University PressNew York, NY, 1998. http://dx.doi.org/10.1093/oso/9780195068771.003.0009.

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Abstract The rate of mutation may be accelerated so that new alleles form in a high proportion of daughter cells. An increased rate of mutation may be a feature of a gene’s structure, which causes its replication to be unfaithful. These structures are commonly referred to as premutations. Alternatively, the machinery for replicating DNA or for repairing replication errors may be flawed as the result of a cell’s genetic constitution or its exposure to mutagenic agents. When these processes alter a mutant gene in the germ line, some offspring are nonpenetrant, whereas others are more severely af

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Furman, C. Sue. "The Silent Epidemic." In Turning Point. Oxford University PressNew York, NY, 1995. http://dx.doi.org/10.1093/oso/9780195087734.003.0006.

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Abstract It is difficult to ignore menopause symptoms like hot flashes and vaginal dryness, but osteoporosis, one of the more serious consequences of menopause, often proceeds unnoticed for years. Unfonunately, what you don’t feel can bun you. Osteoporosis accelerates the gradual rate of bone loss that is normal as one ages. This silent disease eats away at bones, leaving them porous, brittle, and very fragile. The bone that is left is normal, but sometimes there is not enough of it to maintain the integrity of the skeleton and suppon the body’s weight.

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Mishra, Ritu, Saumya Singh, and Suruchi Pandey. "The Impact of Technological Advances on Cultural Conflicts within Organizations." In Business, Management and Economics. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.113095.

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Although some beliefs and norms may not change, as few hold the opinion “culture reflects the heritage of society” rapid pace of digitization and pressures of global competitiveness have accelerated the organizational changing processes and employees behavior patterns. When people from various cultures get together, it might lead to misunderstandings and hostilities. Recent decades have seen significant shifts in cultural norms and values as a direct result of technological advancements. These shifts are happening faster than ever before, and they are causing tension between different cultures

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Phokane Thobi and Gupta Kapil. "Sustainable Manufacturing of Precision Miniature Gears by Abrasive Water Jet Machining – An Experimental Study." In Advances in Transdisciplinary Engineering. IOS Press, 2017. https://doi.org/10.3233/978-1-61499-792-4-401.

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The accelerated global competitiveness and strict environmental regulations have largely been responsible to encourage manufacturers to adopt sustainable or green practices in manufacturing. Whether it is manufacturing of macro or micro products, sustainable techniques are being given considerable importance to improve quality, and enhance productivity with keeping the environment clean and green simultaneously. This article reports on the sustainable manufacturing of precision miniature gears by abrasive waterjet machining (AWJM) technology. The fabricated spur gear has 8400 &mu;m pitch d

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Kaminski, Josilene de Souza da Conceição, Aline dos Santos Moreira de Carvalho, and Paloma Martins Mendonça. "Similarities of clinical practice guidelines in the management of lower pain: Literature review." In Collection of Internacional Topics in Health Sciences V.2. Seven Editora, 2024. http://dx.doi.org/10.56238/sevened2024.016-025.

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Introduction: Clinical practice guidelines aim to assist reasoning and clinical decision-making, improve the effectiveness and efficiency of health care and standardize conduct, including care for patients with low back pain. Considering that evidence-based practice is necessary and that healthcare decisions integrate scientific evidence, knowledge and early adherence by healthcare professionals to clinical practice guidelines can accelerate recovery and reduce costs associated with low back pain. There is no informational material that is easy to read and interpret that encompasses the simila

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Atti di convegni sul tema "Accelerated Flames"

Kumar, Ashok, and Larry D. Stephenson. "Accelerated Low Water Corrosion of Steel Pilings in Seawater." In CORROSION 2005. NACE International, 2005. https://doi.org/10.5006/c2005-05221.

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Abstract The corrosion of steel pilings in seawater was investigated during the past 30 years at two field locations in the United States, one in the Gulf of Mexico at La Costa Island, Florida (1971), and the other in Buzzard’s Bay, Massachusetts (1974). Three rows of 22 test steel H piles, 20.3 cm × 20.3 cm and 12.2 meters long, were installed at the Buzzards Bay, Massachusetts test site, where the test temperature varies from –1° C to +19° C. The steel H-plies were coated with various protection systems, such as coal tar epoxy, polyurethane, flame sprayed zinc and aluminum. Several of the pi

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Lopez-Lopez, D., J. Castrejon, A. Wong-Moreno, B. Campillo, and L. Martinez. "High Temperature Corrosion of Fuel Oil Burner Components." In CORROSION 1999. NACE International, 1999. https://doi.org/10.5006/c1999-99071.

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Abstract The electric power plant technology for the utilization of heavy fuel oil rich in sulphur, vanadium and asphaltenes poses very particular difficulties for plant design and materials selection. The combustion system plays a key role in the performance of power plants. The case study reported in this paper considers the accelerated degradation of air nozzles or air swirlers. The components were operated during one year in a 350 MW boiler. The particular features of corrosion behavior of SA213TP304, SA213TP446 and A297GrHH are presented. Optical, metallographic and microprobe evidence re

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Harvey, M. D. F., S. Shrestha, and A. J. Sturgeon. "Coatings for Offshore Applications by High Velocity Wire Flame Spraying." In CORROSION 2005. NACE International, 2005. https://doi.org/10.5006/c2005-05011.

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Abstract Most commercial high velocity oxy-fuel (HVOF) flame spraying systems are primarily designed for mechanised use in thermal spraying booths and are limited to powder-based consumables that are often much more expensive than wire materials. However, a smaller wire fed HVOF system has recently become available with simpler, portable control units. This system is of particular interest for depositing a wide range of wire-based consumables, e.g. aluminium, zinc and their alloys for sacrificial corrosion protection of offshore platforms, risers and piping, crude oil vessels and bridges. Othe

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Yuh, C. Y., P. Singh, L. Paetsch, and H. C. Maru. "Development of Aluminized Coatings for MCFC Wet Seal Applications." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87276.

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Abstract The molten carbonate fuel cell (MCFC) wet seal area has been found to experience accelerated corrosion in the presence of molten electrolyte because of simultaneous exposure to reducing and oxidizing atmospheres. Development of protective coatings plays an important role in minimizing this corrosion. Various aluminizing processes, such as flame spraying, slurry spraying, pack cementation, and ion vapor deposition, have been evaluated for their effectiveness. Continuous interdiffusion of aluminum and substrate Fe, Ni, and Cr occurred during high-temperature corrosion tests. Among the f

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Albrahim, Ibrahim, Ricardo Costa, Jehad Al-Aithan, Maher Al-Abdullatif, and Abdulaziz Al-Tijani. "Corrosion Control of Acid Flare Lines at Gas Treatment Facility." In MPWT 2019. NACE International, 2019. https://doi.org/10.5006/mpwt19-15242.

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Abstract In any operating facility, the integrity of flare or relief lines should always be closely maintained, as it is one of the most important safeguards during plant upsets or emergency conditions. The most common damage mechanism in acid flare lines is acid gas dew point corrosion”. Corrosion in such systems is often dependent on fluid stagnation, especially in the presence of acidic water, during idle conditions. The intent of this paper is to shed light on the efforts done in a gas treatment facility to identify different root causes that impacted or accelerated Acid Gas Dew Point Corr

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Fowler, Sean, Andy Francis, Bill Tobin, and David Duecker. "Sequential Combining of Ultraviolet Light and Salt Spray Stresses: toward the Next Generation of Test Methods." In SSPC 2018. SSPC, 2018. https://doi.org/10.5006/s2018-00026.

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Abstract Protective coatings exposed to sunlight must withstand multiple environmental stresses: ultraviolet light, moisture, heat, corrosive chlorides and other salts, and atmospheric pollutants. Two decades after the publication of a sequential UV and cyclic salt spray test method in ASTM D5894, some efforts to create better and more predictive test methods have focused on delivering both UV and salt spray in a single chamber and adding additional stresses such as ozone exposure, air pressure fluctuations, atmospheric pollutants such as sulfur dioxide, and other environmental factors. A goal

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Yoko, Matthew, and Matthew P. Juniper. "Inferring Flame Transfer Functions of Turbulent Conical Flames From Pressure Measurements." In ASME Turbo Expo 2024: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/gt2024-122798.

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Abstract We use approximate Bayesian inference, accelerated by adjoint methods, to construct a quantitatively accurate model of the thermoacoustic behaviour of a turbulent conical flame in a duct. We first perform a series of automated experiments to generate a data set. The data consists of time series pressure measurements from which we extract (i) the eigenvalue, whose real part is the growth rate and imaginary part is the angular frequency, and (ii) the pressure eigenmode measured at several axial locations. We assimilate the data into a thermoacoustic network model to infer the unknown mo

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Nassini, Pier Carlo, Daniele Pampaloni, Antonio Andreini, and Roberto Meloni. "Large Eddy Simulation of Lean Blow-Off in a Premixed Swirl Stabilized Flame." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90856.

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Abstract Modern gas turbines usually adopt very lean premixed flames to meet the current strict law restrictions on nitric oxides emissions. In such devices, strong combustion instabilities and blow-off susceptibility often prevent from achieving a stable flame in leaner conditions. Numerical models to predict the lean blow-off in turbulent flames are essential to prevent such instabilities, but the simulation of blow-off still represents a challenge, requiring the appropriate modelling for the turbulence-chemistry interactions and the highly transient behaviour of the flame near the extinctio

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Biagioli, Fernando, Ewald Freitag, and Khawar J. Syed. "Analytical Modelling of Flame-Dynamics Within Auto-Ignition Hydrogen and Methane Flames in Mach Stabilized Combustion." In ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/gt2023-102235.

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Abstract The sequential combustion concept is characterized by two combustor stages. In the first stage a fraction of the fuel is premixed into the air flow before burning in a standard lean premixed flame. In the second stage, which is the focus of the present contribution, the remaining part of the fuel is injected into the hot products arriving from the first stage and combustion takes place in an autoignition-dominated flame. We analyse here a situation where auto-ignition in the second stage takes place in a flow subject to a positive static temperature gradient. This concept allows very

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Pugh, Daniel, Andrew Crayford, Philip Bowen, Tim O’Doherty, and Richard Marsh. "Variation in Laminar Burning Velocity and Markstein Length With Water Addition for Industrially Produced Syngases." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25455.

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An outwardly propagating spherical flame has been used to characterise the influence of water addition on the combustion of variable steelworks gas compositions. Attention was given to the ratio of hydrogen and carbon monoxide within blast furnace gas, and the catalysing influence of water addition on the preponderant reaction kinetics. A nonlinear extrapolative technique was used to obtain values of laminar burning velocity and Markstein length for atmospheric combustion with air and change in equivalence ratio. Four disparate blast furnace gas mixtures were tested with increasing volumetric

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Rapporti di organizzazioni sul tema "Accelerated Flames"

Share, Gerald H., and Ronald J. Murphy. Gamma Radiation From Flare-Accelerated Particles Impacting the Sun. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada594340.

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Chen, Weixing. PR378-173601-Z01 Effect of Pressure Fluctuations on the Growth Rate of Near-Neutral pH SCC. Pipeline Research Council International, Inc. (PRCI), 2021. http://dx.doi.org/10.55274/r0012112.

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This report summarizes the work completed in PRCI SCC-2-12A project: The Effect of Pressure Fluctuations on the Growth Rate of Near-Neutral pH SCC, which is Phase 3 of the work on the same subject of investigation. The following insights from the current phase of the PRCI SCC-2-12A project are thought to be the most important: - Near neutral pH crack initiation is pressure-fluctuation dependent. Severe pressure fluctuations accelerate the fracture and spallation of mill scale on the pipeline steel surfaces, making it harder to initiate SCC cracks from the bottom of pits that are developed at f

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