Relevant bibliographies by topics / Combustion ratio

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Combustion ratio'

Author: Grafiati
Published: 28 June 2021
Last updated: 29 July 2025

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Journal articles on the topic "Combustion ratio"

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Najib Aminu Ismail, Mazlan Abdul Wahid, Aminuddin Sa'at, Abubakar Shitu, and Mohammed Bashir Abdulrahman. "Effect of Recirculation Ratio on the Combustion Characteristics of an Asymmetric Swirling Flameless Combustor using Biogas." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 108, no. 1 (2023): 52–65. http://dx.doi.org/10.37934/arfmts.108.1.5265.

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This study investigates the influence of recirculation ratio on the combustion characteristics of an asymmetric swirling flameless combustor. The recirculation ratio, defined as the ratio of the total recirculation mass flow rate to the primary air mass flow rate, plays a crucial role in determining the performance and emission characteristics of combustion systems. The asymmetric swirling flameless combustor offers potential advantages in terms of enhanced fuel flexibility, reduced pollutant emissions, and improved combustion stability. Through varying the recirculation ratio, the combustion
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Cheng, Zhe, Wen Jun Wang, Wen Qing Shen, Ai Wu Fan, and Wei Liu. "Flame Stability of Methane/Air Mixture in a Heat-Recirculating-Type Mesoscale Channel with a Bluff-Body." Applied Mechanics and Materials 325-326 (June 2013): 12–15. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.12.

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To extend the stable combustion range of micro-combustor, a heat-recirculating-type planar micro-combustor fitted with a bluff-body was proposed in the present work. Numerical simulation on CH4/air premixed combustion in this combustor was performed and the stable combustion range was determined, which showed that the blow-off limit increases with the equivalence ratio and the lower flammability limit was extended. Effect of the equivalence ratio and inlet velocity on combustion efficiency and maximum temperature were investigated. The numerical results showed that combustion efficiencies were
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Cao, H. L., J. N. Zhao, K. Zhang, D. B. Wang, and X. L. Wei. "Diffusion Combustion Characteristics of H2/Air in the Micro Porous Media Combustor." Advanced Materials Research 455-456 (January 2012): 413–18. http://dx.doi.org/10.4028/www.scientific.net/amr.455-456.413.

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In order to improve thermal to-electric energy conversion efficiency of the micro gas turbine power generation system, a novel micro porous media combustor is designed and experimental investigation on the H2/air diffusion combustion is performed to obtain its combustion characteristics. High efficiency diffusion combustion of H2/air can be stabilized in the very wide operating range, especially at higher excess air ratio. Exhaust gas temperature is markedly improved and meanwhile heat loss ratio is evidently decreased. Moreover, in the certain operating ranges, the greater the combustion ther
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Li, Shou-Zhe, Yu-Long Niu, Shu-Li Cao, Jiao Zhang, Jialiang Zhang, and Xuechen Li. "The effect of plasma discharge on methane diffusion combustion in air assisted by an atmospheric pressure microwave plasma torch." Journal of Physics D: Applied Physics 55, no. 23 (2022): 235203. http://dx.doi.org/10.1088/1361-6463/ac50cb.

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Abstract An atmospheric pressure air microwave plasma torch is employed to assist methane diffusion combustions using a combination of a combustor and burner. Experimentally, the effect of the air microwave plasma on combustion is investigated with respect to the flame morphology and the variation of gas components in the exhaust with the fuel equivalence ratio φ or the methane flow rate by comparing plasma-assisted combustion (PAC) and natural combustion (NC) without plasma application. The combustion degree of CH4 in PACs is found to be much enhanced in rich fuel combustion than in NC in bot
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Wakabayashi, T., S. Ito, S. Koga, et al. "Performance of a Dry Low-NOx Gas Turbine Combustor Designed With a New Fuel Supply Concept." Journal of Engineering for Gas Turbines and Power 124, no. 4 (2002): 771–75. http://dx.doi.org/10.1115/1.1473154.

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This paper describes the performance of a dry low-NOx gas turbine combustor designed with a new fuel supply concept. This concept uses automatic fuel distribution achieved by an interaction between the fuel jet and the airflow. At high loads, most of the fuel is supplied to the lean premixed combustion region for low-NOx, while at low loads, it is supplied to the pilot combustion region for stable combustion. A numerical simulation was carried out to estimate the equivalence ratio in the fuel supply unit. Next, through the pressurized combustion experiments on the combustor with this fuel supp
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Chun, Young Nam, and June An. "Development of Cavity Matrix Combustor for Biogas Application." ASEAN Journal of Chemical Engineering 22, no. 2 (2022): 306. http://dx.doi.org/10.22146/ajche.76154.

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The use of conventional fossil fuels has limitations in energy resources and environmental problems such as greenhouse gas, air pollution, etc. Biogas has sustainable and renewable characteristics that can be used as an alternative energy source to alleviate these problems. In this study, we proposed a novel cavity matrix combustor that directly enables the combustion of what is produced in small and medium-sized biogas facilities without separation or purification. We also identified combustion characteristics for changes in air ratio, gas feed rate, biogas ratio, and exhaust gas recirculatio
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Liao, Yunzhe, Chenghua Zhang, Yanrong Chen, and Yunfei Yan. "Combustion Performance of Methane/Air in a Micro Combustor Embedded Hollow Hemispherical Slotted Bluff Body." Energies 15, no. 11 (2022): 4033. http://dx.doi.org/10.3390/en15114033.

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With the rapid development of micro-energy power systems, the performance of micro-combustors as key components is in urgent need of further improvement. Aimed at enhancing combustion performance, a hollow hemispherical bluff body was used to analyze the methane combustion process. In this paper, we exploited the detailed reaction mechanism of methane/air with a laminar finite-rate model; the numerical analysis of methane combustion in the micro-combustor was carried out by Ansys Fluent software. The combustion, flow and thermal characteristics of the micro-combustor embedded with a hollow hem
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Wang, Taiyu, Zhenguo Wang, Zun Cai, et al. "Effects of combustor geometry on the combustion process of an RBCC combustor in high-speed ejector mode." Modern Physics Letters B 33, no. 27 (2019): 1950330. http://dx.doi.org/10.1142/s0217984919503305.

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The combustion characteristics of high-speed ejector mode in a 2-dimensional strut-based RBCC (rocket-based combined cycle) combustor had been investigated numerically in a Mach 2.5 supersonic flow. The numerical approach had been validated by comparing numerical results with available experimental data. Besides, three different hydrogen-air chemical reaction mechanisms had also been compared. The effect of the combustor geometry on the combustion process was then discussed by analyzing the heat release distribution and flow field. It was found that the wall configuration, closeout angle of th
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Du, Zhibin, Chao Chen, and Lei Wang. "Combustion characteristics of and bench test on “gasoline + alternative fuel”." Thermal Science, no. 00 (2020): 324. http://dx.doi.org/10.2298/tsci200704324d.

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In this study, an evaporative premixed constant-volume combustion system was designed for combustion of liquid fuels, compared with a traditional constant-volume firebomb. The effects of an alternative fuel of gasoline on the combustion characteristics of the laminar flame of gasoline were analyzed, and then a bench test was carried out. The results show that the addition of an alternative fuel of gasoline makes the maximum non-stretched flame propagation velocity of combusting gasoline increasingly close to that of combusting diluted mixed gas. The Markstein lengths of gasoline and ?gasoline
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Colantonio, R. O. "The Applicability of Jet-Shear-Layer Mixing and Effervescent Atomization for Low-NOx Combustors." Journal of Engineering for Gas Turbines and Power 120, no. 1 (1998): 17–23. http://dx.doi.org/10.1115/1.2818073.

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An investigation has been conducted to develop appropriate technologies for a low-NOx, liquid-fueled combustor. The combustor incorporates an effervescent atomizer used to inject fuel into a premixing duct. Only a fraction of the combustion air is used in the premixing process. This fuel-rich mixture is introduced into the remaining combustion air by a rapid jet-shear-layer mixing process involving radial fuel–air jets impinging on axial air jets in the primary combustion zone. Computational modeling was used as a tool to facilitate a parametric analysis appropriate to the design of an optimum
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Dissertations / Theses on the topic "Combustion ratio"

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Lundin, Eva. "Adaptive air-fuel ratio control for combustion engines." Thesis, Linköping University, Department of Electrical Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-56651.

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<p>Around the world, vehicle emission regulations become stricter, increasing exhaust emission demands. To manage these rules and regulations, vehicle manufacturers put a lot of effort into minimizing the exhaust emissions. The three-way catalytic converter was developed, and today it is the most commonly used device to control the exhaust emissions.</p><p>To work properly the catalytic converter needs to control the air-fuel mixture with great precision. This then increases the demands on the engine management systems, causing them to become more complex. With increased complexity, the time e
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Brandstetter, Markus. "Robust air-fuel ratio control for combustion engines." Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627144.

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Kirtaş, Mehmet. "Large Eddy Simulation of a High Aspect Ratio Combustor." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14134.

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The present research investigates the details of mixture preparation and combustion in a two-stroke, small-scale research engine with a numerical methodology based on large eddy simulation (LES) technique. A major motivation to study such small-scale engines is their potential use in applications requiring portable power sources with high power density. The investigated research engine has a rectangular planform with a thickness very close to quenching limits of typical hydrocarbon fuels. As such, the combustor has a high aspect ratio (defined as the ratio of surface area to volume) that makes
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De, Zoysa Merrenna Manula. "Neural network estimation of air-fuel ratio in internal combustion engines." Thesis, University of Brighton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399048.

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This thesis presents an investigation into a novel method of estimating the air-fuel ratio of a gasoline-fuelled spark-ignition internal combustion engine. The measurement of the air-fuel ratio is important for controlling an engine to reduce exhaust emissions. In production vehicles, the air-fuel ratio is measured using an exhaust gas analyser and the exhaust emissions are reduced by using electronically controlled three-way catalytic converters, which are expensive and subject to operationallimitations such as, requiring the engine to operate with a stoichiometric air-fuel ratio. A micro-pro
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Grant, Marcus Paul. "Computer control of air-gas ratio for nozzle mix systems." Thesis, Coventry University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390222.

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TEIXEIRA, RENATO NUNES. "INTERNAL COMBUSTION ENGINES WITH VARIABLE COMPRESSION RATIO: A THEORETICAL AND EXPERIMENTAL ANALYSIS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19099@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>É realizado um estudo teórico experimental sobre motores a combustão interna operando com taxa de compressão variável. É feita uma análise teórica sobre determinado mecanismo que permite variar a taxa de compressão. Para tal foi utilizado um programa de simulação para motores com ignição por centelha. No presente trabalho o modelo de simulação foi aprimorado, com a inclusão de previsão de detonação, de emissão de hidrocarbonetos, do cálculo da potencia de atrito, ass
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Alshuqaiq, Mohammad Abdullah. "An Analysis of Oil Combustion on Snow." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/789.

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Several Arctic council reports conclude that oil spills are the most significant threat to the Arctic ecosystem. Some studies have shown that in-situ burning (ISB) of oil spills over water can remove more than 90% of the oil, and is the most promising technology for an efficient response to oil spills in the Arctic region. The definition of "In situ" is intentional, controlled burning of oil in place (i.e., without extracting or removing the oil first). Earlier studies [Bellino (WPI 2012), Farahani, (WPI 2014)] have investigated burning behavior of crude oil on ice, similar to what one would
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Kamal, Rajit. "CFD simulation of mixing in a carbon black reactor : optimum geometry and momentum ratio." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/11254.

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Petrolati, Andrea. "Fate of nitrogen/trace metals species during combustion and gasification of biomass." Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/7011.

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This thesis focused on the fate of nitrogen and trace metals species from combustion and gasification of biomass. The effect of process parameters on the release of these species during pilot-scale combustion and gasification of biomass was investigated and the information used to identify methods for the reduction of these species. The investigation focused on Miscanthus and Dried distillers’ grains with solubles (DDGS). The pilot-scale test rigs used were a fluidised-bed combustor and a fixed-bed downdraft gasifier. The two fuels were analysed by means of proximate, ultimate and ash analysis
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Faulkner, Jason Christopher. "A study of ignition and flame propagation in a small, high surface-to-volume ratio combustor." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/12439.

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Books on the topic "Combustion ratio"

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E, Smith C., Holdeman J. D, and United States. National Aeronautics and Space Administration., eds. CFD assessment of orifice aspect ratio and mass flow ratio on jet mixing in rectangular ducts. National Aeronautics and Space Administration, 1994.

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DuBeau, Robert William. An investigation of the effects of fuel composition on combustion characteristics in a T-63 combustor. Naval Postgraduate School, 1985.

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United States. National Aeronautics and Space Administration., ed. Comparison of high aspect ratio cooling channel designs for a rocket combustion chamber. National Aeronautics and Space Administration, 1997.

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Jankowsky, Robert S. Experimental performance of a high-area-ratio rocket nozzle at high combustion chamber pressure. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.

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Jankovsky, Robert S. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. National Aeronautics and Space Administration, Glenn Research Center, 1999.

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D, Smith Timothy, Pavli Albert J, and NASA Glenn Research Center, eds. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. National Aeronautics and Space Administration, Glenn Research Center, 1999.

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D, Smith Timothy, Pavli Albert J, and NASA Glenn Research Center, eds. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. National Aeronautics and Space Administration, Glenn Research Center, 1999.

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M, Kazaroff John, Pavli Albert J, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. Experimental performance of a high-area-ratio rocket nozzle at high combustion chamber pressure. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.

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D, Smith Timothy, Pavli Albert J, and NASA Glenn Research Center, eds. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. National Aeronautics and Space Administration, Glenn Research Center, 1999.

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M, Kazaroff John, Pavli Albert J, and United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. Experimental performance of a high-area-ratio rocket nozzle at high combustion chamber pressure. National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1996.

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Book chapters on the topic "Combustion ratio"

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Ji, Changwei, Jianpu Shen, and Shuofeng Wang. "Numerical Investigation of Combustion Characteristics of the Port Fuel Injection Hydrogen-Oxygen Internal Combustion Engine Under the Low-Temperature Intake Condition." In Proceedings of the 10th Hydrogen Technology Convention, Volume 1. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-8631-6_3.

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AbstractThe flammability limits of the hydrogen-oxygen mixture are extremely wide, and the ignition energy is low. Due to its excellent combustion properties, the hydrogen-oxygen mixture can be used as fuel in internal combustion engines (ICEs). However, the combustion of hydrogen-oxygen mixture is too intense, which results in limited research on its application in ICEs and is limited to low-temperature conditions in aerospace. This research aims to numerically discuss the coupling effects of equivalence ratio and ignition timing on the port fuel injection hydrogen-oxygen ICE under the low-te
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Neij, H. M., B. Johansson, and M. Aldén. "Cycle-Resolved Two-Dimensional Laser-Induced Fluorescence Measurements of Fuel/Air Ratio Correlated to Early Combustion in a Spark-Ignition Engine." In Unsteady Combustion. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1620-3_17.

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Hasatani, Masanobu, Hitoki Matsuda, and Yong Chen. "Effect of Fuel Ratio on Coal Pyrolysis and Nitrogen Emission Behaviour." In Combustion Technologies for a Clean Environment. CRC Press, 2022. http://dx.doi.org/10.1201/9780367810597-54.

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Bestehorn, M., and H. Haken. "Synergetics Applied to Pattern Formation in Large-Aspect-Ratio Systems." In Dissipative Structures in Transport Processes and Combustion. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-84230-6_10.

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Hase, K., Y. Kori, and K. Ohgi. "Effect of the Air/Fuel Ratio Fluctuation on the Formation of Nitrogen Oxides." In Combustion Technologies for a Clean Environment. CRC Press, 2022. http://dx.doi.org/10.1201/9780367810597-63.

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Hötte, Felix, Oliver Günther, Christoph von Sethe, Matthias Haupt, Peter Scholz, and Michael Rohdenburg. "Lifetime Experiments of Regeneratively Cooled Rocket Combustion Chambers and PIV Measurements in a High Aspect Ratio Cooling Duct." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_18.

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Abstract This paper aims at experimental investigations of the life limiting mechanisms of regeneratively cooled rocket combustion chambers, especially the so called doghouse effect. In this paper the set up of a cyclic thermo-mechanical fatigue experiment and its results are shown. This experiment has an actively cooled fatigue specimen that is mounted downstream of a subscale GOX-GCH$$_{\text {4}}$$ combustion chamber with rectangular cross section. The specimen is loaded cyclically and inspected after each cycle. The effects of roughness, the use of thermal barrier coatings, the length of t
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Chen, Yang, Junnan Chao, Hairui Yang, et al. "Mass Balance Performance of A 300 MW CFB Boiler Burning Blend Fuel with Different Mixing Ratio." In Cleaner Combustion and Sustainable World. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30445-3_78.

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Duan, Lunbo, and Lin Li. "OCAC Technology in Oxy-Fuel Combustion for Carbon Capture." In Oxygen-Carrier-Aided Combustion Technology for Solid-Fuel Conversion in Fluidized Bed. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9127-1_4.

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AbstractOxy-fuel combustion is regarded as one of the most promising carbon capture and storage technologies to mitigate the climate change, which has been widely studied and demonstrated in academia and industry. In the oxy-fuel process, a mixture of recycled flue gas and pure O2 obtained from an air separation unit is introduced into the combustion chamber to replace air as oxidant gas. Therefore, high concentration of CO2 can be obtained in flue gas, which is suitable for the subsequent carbon storage and utilization. It also has other advantages, such as low NOx emission, easy scale-up, an
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Saxena, Mohit Raj, and Rakesh Kumar Maurya. "Impact of Fuel Premixing Ratio and Injection Timing on Reactivity Controlled Compression Ignition Engine." In Combustion for Power Generation and Transportation. Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-3785-6_13.

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Uddalok Sen, Aayush Sharma, Suvabrata Panja, Saikat Mukherjee, Swarnendu Sen, and Achintya Mukhopadhyay. "Correlation of Equivalence Ratio with Spectrometric Analysis for Premixed Combustion." In Fluid Mechanics and Fluid Power – Contemporary Research. Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2743-4_141.

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Conference papers on the topic "Combustion ratio"

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Caton, Jerald A. "The Effects of Compression Ratio and Expansion Ratio on Engine Performance Including the Second Law of Thermodynamics: Results From a Cycle Simulation." In ASME 2007 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/icef2007-1647.

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This investigation quantified the effects of compression ratio and expansion ratio on performance, efficiency, and second law parameters for an automotive, spark-ignition engine. The well known increase in engine performance for increasing compression ratio and expansion ratio is demonstrated. These increases for brake engine performance are modest for compression ratios greater than about 10 for the conditions studied. The results demonstrated that the increasing friction and heat losses for the higher compression ratios are of the same order as the thermodynamic gains. Also, the results incl
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Miyashita, Moeno, Akiko Matsuo, Eiji Shima, et al. "Combustion Characteristics of Reflective Shuttling Detonation Combustor with Different Equivalence Ratio." In AIAA SCITECH 2024 Forum. American Institute of Aeronautics and Astronautics, 2024. http://dx.doi.org/10.2514/6.2024-2611.

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Ilic, Mladen S., Simeon N. Oka, and M. Radovanovic. "EXPERIMENTAL INVESTIGATION OF CHAR COMBUSTION KINETICS - CO/CO2 RATIO DURING COMBUSTION." In International Heat Transfer Conference 10. Begellhouse, 1994. http://dx.doi.org/10.1615/ihtc10.4990.

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Paschereit, Christian Oliver, Ephraim Gutmark, and Wolfgang Weisenstein. "Control of Combustion Driven Oscillations by Equivalence Ratio Modulations." 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-118.

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Unstable thermoacoustic modes were investigated and controlled in an experimental low-emission swirl stabilized combustor, in which the acoustic boundary conditions were modified to obtain combustion instability. Several axisymmetric and helical unstable modes were identified for fully premixed conditions. The combustion structure associated with the different unstable modes was visualized by phase locked images of OH chemiluminescence. The axisymmetric mode showed large variation of the heat release during one cycle, while the helical mode showed variation in the radial location of maximal he
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Dyuisenakhmetov, Aibolat, Harsh Goyal, Moez Ben Houidi, Rafig Babayev, Jihad Badra, and Bengt Johansson. "Isobaric Combustion at a Low Compression Ratio." In WCX SAE World Congress Experience. SAE International, 2020. http://dx.doi.org/10.4271/2020-01-0797.

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Saxena, Aditi, and Abdelkader Frendi. "Effect of Equivalence Ratio on Combustion Instabilities." In 10th AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-2931.

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Sattelmayer, Thomas. "Influence of the Combustor Aerodynamics on Combustion Instabilities From Equivalence Ratio Fluctuations." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0082.

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Gas turbine combustors are often susceptible to self excited oscillations, which lead to unacceptable levels of pressure, velocity and heat release fluctuations. Although instabilities can occur in systems with locally constant equivalence ratio, it is very important to take into account the influence of equivalence ratio fluctuations, which are generated in the fuel air mixer in the unstable case. These fluctuations are convected into the flame and lead to an additional mechanism for the generation of heat release fluctuations. Moreover, entropy waves are produced in the flame, which travel t
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Malpress, Ray, and David R. Buttsworth. "A Comparison Between Two-Position Variable Compression Ratio and Continuously Variable Compression Ratio Engines Using Numerical Simulation." In ASME 2009 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/icef2009-14042.

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Two types of variable compression ratio engine are considered: i) a continuously variable compression ratio (VCR) device that optimises engine efficiency at all loads, and ii) a VCR device that allows the engine to operate at one of two discrete compression ratios. The simulated engine configuration uses late intake valve closing (LIVC). A maximum geometric compression ratio (GCR) of 17:1 is adopted in the simulations resulting in a constant effective compression ratio of 10.2:1 in all configurations. Reduction from full load is achieved in the simulation with LIVC until the maximum GCR is rea
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Speth, Raymond L., H. Murat Altay, Duane E. Hudgins, and Ahmed F. Ghoniem. "Dynamics and Stability Limits of Syngas Combustion in a Swirl-Stabilized Combustor." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51023.

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The combustion dynamics, stability bands and flame structure of syngas flames under different operating conditions are investigated in an atmospheric pressure swirl-stabilized combustor. Pressure measurements and high-speed video data are used to distinguish several operating modes. Increasing the equivalence ratio makes the flame more compact, and in general increases the overall sound pressure level. Very close to the lean blowout limit, a long stable flame anchored to the inner recirculation zone is observed. At higher equivalence ratios, a low frequency, low amplitude pulsing mode associat
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Yadav, Priyanka, and Nagendra P. Yadav. "Prediction of Combustion Performance of Biodiesel in Gas Turbine Combustor." In ASME 2021 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/fedsm2021-66282.

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Abstract This paper focuses the computational fluid dynamics analysis inside the gas turbine combustor for the combustion of biodiesel and air mixture. The biodiesel (methyl soyate) is made from the vegetable oil (soybean oil). ANSYS fluent is used for Numerical simulation and model adapted Eddy dissipation concept for turbulence, discrete model, k-epsilon (standard), and the species transport. The model was validated and the combustion performance of biodiesel is predicted with an air-assist injector. The fuel spray is created by commercially available airblast atomizer in this study. The str
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Reports on the topic "Combustion ratio"

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Brunner, Huschenbett, and Beshouri. PR-336-06206-R01 Engine Control for Legacy Engines - Cylinder and Cycle Level Control. Pipeline Research Council International, Inc. (PRCI), 2014. http://dx.doi.org/10.55274/r0010041.

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The reduction or even elimination of cylinder to cylinder combustion variation and cycle-to-cycle combustion instability may result in further nitrous oxides (NOx) reductions at the same engine average air/fuel ratio (and hence turbocharger operating point) or allow operation at a leaner air/fuel ratio before the onset of instability. Reductions in imbalance and instability can also reduce carbon pollutant emissions, reduce break specific fuel consumption (BSFC) and improve engine operability. Achieving these goals requires a better understanding of the sources and impacts of that imbalance an
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Beshouri, Huschenbett, and Bothwell. PR-360-08207-R01 Cylinder Level Sensing and Control on Typical Pipeline Engines. Pipeline Research Council International, Inc. (PRCI), 2016. http://dx.doi.org/10.55274/r0010693.

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Further reductions in NOx emissions while maintaining optimum engine performance can only be obtained by improving engine combustion control at the cylinder level. This requires cylinder level sensors capable of continuously monitoring combustion performance in both the main combustion chamber (MCC) and the pre-combustion chamber (PCC) and electronically actuated valves that can respond to those measurements. Until recently, in-PCC combustion measurements on spark ignited engines were only possible in the laboratory using very expensive pressure sensors with extremely short lives. Ion Sense of
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Kudo, Yugo, and Hiroshi Nakajima. Numerical Study on Frequency Distribution of Equivalence Ratio for Diesel Combustion. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0654.

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

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Prior attempts to develop a generic Parametric Emissions Monitoring methodology for combustion turbines, particularly low emissions units, have failed due either to the reduction of a complex problem to too few degrees of freedom or the brute force reliance on regression analysis. Field test data collected by the research team clearly illustrated that a successful PEMS model will need to incorporate multiple zones to account for pilot fuel versus pre-mixed combustion, and changes in air/fuel ratio at the flame front. The information reported herein shows that, ideally, the PEMS model should re
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Geyer, Klaus, Christine Hallé, and Heiko Roßkamp. Fast Response Measurement of Combustion Air to Fuel Ratio for Stratified Two-Stroke Engines. SAE International, 2005. http://dx.doi.org/10.4271/2005-32-0109.

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Kitabatake, Ryo, Naoki Shimazaki, and Terukazu Nishimura. Expansion of Premixed Compression Ignition Combustion Region by Supercharging Operation and Lower Compression Ratio Piston. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0436.

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Panek, McCarthy, and Drayton. PR-312-12208-R04 NO2-NOx Ratio Data Compilation and Assessment. Pipeline Research Council International, Inc. (PRCI), 2016. http://dx.doi.org/10.55274/r0011012.

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When modeling NO2 impacts from combustion sources, justification is required to receive approval of a representative in-stack NO2/NOx ratio, which is a key model input when using advanced modeling tiers that consider plume chemistry. A September 30, 2014 EPA memorandum requires approval by the Regional Office on a case-by-case basis regarding the selection and application of the in-stack NO2/NOx ratio. The EPA Tier 2 Ambient Ratio Method (ARM2) and Tier 3 Ozone Limiting Method (OLM) and Plume Volume Molar Ratio Method (PVMRM) NO2 methods require an in-stack NO2/NOx ratio (ISR) as an input to A
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Hedrick and Jacobs. PR-457-14201-R01 Variable Natural Gas - Composition Effects and Control Methods for Two-Stroke Engines. Pipeline Research Council International, Inc. (PRCI), 2015. http://dx.doi.org/10.55274/r0010027.

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Literature is reviewed for the impacts of variable natural gas composition on two-stroke lean burn pipeline compressor engines. Information gathered for these engines can be simplified for development of control algorithms in four-stroke and richer burning engines. Data shows that geospatial, geological, and transient hydraulic effects cause composition variations that adversely affect engine emissions, efficiency, rated performance, and operational safety considering auto-ignition effects. In order to compensate for these changes in composition, better engine control schemes can help meet des
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Morikawa, Koji, Makot Kaneko, Yasuo Moriyoshi, and Masaki Sano. Proposition of a New Gasoline Combustion System With High Compression Ratio and High Thermal Efficiency~2nd Report: An Experimental Verification and Combustion Analysis. SAE International, 2005. http://dx.doi.org/10.4271/2005-08-0007.

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Beshouri and Richter. PR-309-05203-R01 Field Feasibility Testing of lon Sense Technology On Typical NSCR Engines. Pipeline Research Council International, Inc. (PRCI), 2006. http://dx.doi.org/10.55274/r0010729.

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The objective for this research was to conduct field-testing of typical Non Selective Catalytic Reduction (NSCR) Fitted Rich Burn pipeline engines to assess the feasibility of utilizing Ion Sense for cylinder level combustion diagnostics, load balancing and air fuel ratio indications. Sufficiently define the potential benefits of lon Sense in this application so that third party manufacturers and/or other funding agencies will consider further development and commercialization.
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