Dissertations / Theses on the topic 'Burning velocity'
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Saeed, Khizer. "Laminar burning velocity measurements." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270733.
Full textYamashita, H., N. Hayashi, M. Ozeki, and K. Yamamoto. "Burning velocity and OH concentration in premixed combustion." Elsevier, 2009. http://hdl.handle.net/2237/20032.
Full textYang, Bo. "Laminar burning velocity of liquefied petroleum gas mixtures." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/35958.
Full textTaylor, Simon Crispin. "Burning velocity and the influence of flame stretch." Thesis, University of Leeds, 1991. http://etheses.whiterose.ac.uk/2099/.
Full textVaccaro, Danilo. "Experimental determination of burning velocity in metal dust explosions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Find full textKolbe, Massimiliano. "Laminar burning velocity measurements of stabilized aluminum dust flames." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ64068.pdf.
Full textOhnishi, Masahiro, Shinji Isii, and Kazuhiro Yamamoto. "Local flame structure and turbulent burning velocity by joint PLIF imaging." Elsevier, 2011. http://hdl.handle.net/2237/20034.
Full textSavarianandam, Vivek Ross. "Burning velocity of premixed turbulent flames in the weakly wrinkled regime." Thesis, Queen Mary, University of London, 2005. http://qmro.qmul.ac.uk/xmlui/handle/123456789/1867.
Full textLucianelli, Dario. "Numerical and experimental analysys of the laminar burning velocity of hydrocarbons mixtures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Find full textClarke, Andrew. "Measurement of laminar burning velocity of air/fuel/diluent mixtures in zero gravity." Thesis, University of Oxford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259780.
Full textRockwell, Scott. "Influence of Coal Dust on Premixed Turbulent Methane-Air Flames." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-dissertations/343.
Full textHung, Jocelyn. "Effects of propane or ethane additives on laminar burning velocity of methane-air mixtures." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26297.
Full textApplied Science, Faculty of
Mechanical Engineering, Department of
Graduate
Xie, Yanxuan. "Study of Interaction of Entrained Coal Dust Particles in Lean Methane-Air Premixed Flames." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/1065.
Full textYAMASHITA, Hiroshi, Naoki HAYASHI, Tsutomu ISAYAMA, Kazuhiro YAMAMOTO, 博史 山下, 直樹 林, 勉. 伊佐山, and 和弘 山本. "対向流予混合火炎中のOH濃度と燃焼速度." 日本燃焼学会, 2007. http://hdl.handle.net/2237/19735.
Full textHinton, Nathan Ian David. "Measuring laminar burning velocities using constant volume combustion vessel techniques." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:5b641b04-8040-4d49-a7e8-aae0b0ffc8b5.
Full textYAMAMOTO, Kazuhiro, Naoki HAYASHI, Hiroshi YAMASHITA, Kazuki NONOMURA, 和弘 山本, 直樹 林, 博史 山下, and 一樹 野々村. "非定常対向流予混合火炎の火炎構造に与える流入速度変動の影響に関する数値解析." 一般社団法人 日本機械学会, 2008. http://hdl.handle.net/2237/19801.
Full textTeng, Fei. "The effect of hydrogen concentration on the flame stability and laminar burning velocity of hydrogen-hydrocarbon-carbon dioxide mixtures." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/8903/.
Full textWhiston, Philip John. "Measurement of mass fraction burnt and turbulent burning velocity in a four cylinder spark ignition engine fuelled with simulated biogas." Thesis, Staffordshire University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293557.
Full textEndouard, Charles. "Etude expérimentale de la dynamique des flammes de prémélange isooctane/air en expansion laminaire et turbulente fortement diluées." Thesis, Orléans, 2016. http://www.theses.fr/2016ORLE2043/document.
Full textFor several years, “downsizing” is used by car manufacturers to develop new spark ignition engines. This method based on the reduction of engine size combined with an increase of intake pressure (turbocharger) is well known to reduce pollutant emissions and increase efficiency. New thermodynamic, turbulent and dilution conditions could be used with these new engines but they can bring new issues like unusual combustion or cyclic variability. This thesis took place to improve the understanding of premixed expanding isooctane/air flames behavior under downsized engine-like conditions. As a first step, this work is conducted under laminar conditions to extract laminar burning velocities and Markstein lengths of the different mixtures, especially under high dilution. New correlations are then developed to answer the needs of numerical models. A new optical dispositive is then used to improve the visualization of turbulent expanding flames. A corrective coefficient correlation is proposed to avoid the overestimated values of turbulent burning speed generated by Schlieren visualization with such turbulent flames. A deep survey of starting conditions (temperature, pressure, turbulence, dissipative characteristics of air/fuel mixtures) influence is done to investigate the effect of each parameters on the development and the propagation of the turbulent flame. Finally, the effect of a coupled rise of initial temperature and pressure, similar to an engine compression, is studied to better understand the changes of flame behavior under more realistic spark-ignition engine conditions
Lami, Mattia. "Adapting the Heat Flux Method for Metal Fuels." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Find full text山本, 和弘, and Kazuhiro YAMAMOTO. "格子ボルツマン法による燃焼場の数値計算." 日本機械学会, 2002. http://hdl.handle.net/2237/9349.
Full text山本, 和弘, Kazuhiro YAMAMOTO, 昌幸 丸山, Masayuki MARUYAMA, 義昭 小沼, and Yoshiaki ONUMA. "希薄燃焼に及ぼす水素添加の効果." 日本機械学会, 1998. http://hdl.handle.net/2237/9318.
Full textTahtouh, Toni. "Les effets combinés de l'hydrogène et de la dilution dans un moteur à allumage commandé." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00604166.
Full textDirrenberger, Patricia. "Étude experimentale et theorique des vitesses de flammes laminaires d'hydrocarbures." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0035/document.
Full textThe laminar burning velocity is a key parameter in the combustion of hydrocarbons study. It plays an essential role in the combustion science area since it is used for the validation of numerical models, the design of burners or to predict potential flashback or blow off of the flame. The goal of the thesis was the study of laminar burning velocities of many hydrocarbons found in natural gases, gasolines or diesel fuels. This work includes an experimental part and a modeling part. The experimental part allowed the implementation of the literature database for different air/hydrocarbons mixtures. The experiments were performed with a new apparatus developed at LRGP (Laboratoire Réactions et Génie des Procédés) for the measurement of laminar burning velocities by the heat flux method thanks to a flat flame adiabatic burner. This method is based on balancing of the heat loss required for the flame stabilization by the convective heat flux from the burner surface to the flame front. The burner head is a thick perforated plate included in a plenum mixing chamber and the measurement of the radial distribution of the temperature is performed with a thermocouples series. This apparatus was first used at atmospheric pressure and several temperatures to measure laminar burning velocities of gaseous compounds (alkanes, alkenes, hydrogen-enriched or oxygen-enriched methane, natural gases, methane-ethane and methane-propane mixtures) and liquid compounds (alkanes, ethanol, commercial gasoline and model fuel with addition of ethanol or not, alkylcyclohexanes, alkylbenzènes). The apparatus was then placed in a chamber in order to work under pressures theoretically up to 10 atm. Laminar burning velocities of two compounds were studied at room temperature and high pressure : a gaseous compound, methane, for pressures up to 6 atm and a liquid compound, n-pentane, for pressures up to 4 atm. A modelling study completed this work by using detailed kinetic models for the combustion of studied compounds. These models were tested by the simulation of experimental results previously obtained, in various equivalence ratio, temperature and pressure conditions
Doddo, Stefano. "Implementazione di cinetiche di dettaglio nella simulazione numerica di fiamme premiscelate." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19679/.
Full textMarashi, Seyedeh Sepideh. "Network Modeling Application to Laminar Flame Speed and NOx Prediction in Industrial Gas Turbines." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-113708.
Full textLandry, Ludovic. "Etude expérimentale des modes de combustion essence sous forte pression et forte dilution." Phd thesis, Université d'Orléans, 2009. http://tel.archives-ouvertes.fr/tel-00461253.
Full textRanganathan, Sreenivasan. "Influence of Dusts on Premixed Methane-Air Flames." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/86.
Full textMumby, Christopher. "Predictions of explosions and fires of natural gas/hydrogen mixtures for hazard assessment." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6354.
Full textNonaka, Hugo Ohno Barbosa. "Medição da velocidade de queima laminar de biogás e gás de síntese através do método do fluxo de calor e comparação com mecanismos cinéticos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/118889.
Full textThe adiabatic laminar burning velocity is an important combustion parameter that dictates premixed flames characteristics. Among the measuring methods available in literature, the heat flux method stands out for its simplicity and accuracy. In the present work, this method is used to measure the adiabatic laminar burning velocity of biogas (modeled as CH4 with different dilution levels with CO2) and syngas (modeled as a CH4, H2, CO, CO2 and N2 mixture) in air at 298 K and 1 atm. Such gases are of growing society interest due to environmental aspects, however, their adiabatic laminar burning velocity have not been widely studied yet. The experimental results are compared to predictions of five kinetic mechanisms (GRI-Mech 3.0, Davis et al., Konnov, San Diego e USC Mech II) to evaluate their predictive capacity. Experimental and numerical results of biogas/air mixtures adiabatic laminar burning velocity show good agreement and the found uncertainties are in agreement with literature. Experimental results of this gas were fitted in an empiric correlation of simple numerical application. Experimental results of the laminar burning velocity of syngas/air, on the other hand, show lower values than the numerical predictions of all studied kinetic mechanisms. Literature available data for the same mixture differ both in values and behavior of the present work results. Such behavior is probably related to some contamination on the CO used since a chemi-luminescence not reported in literature can be noted when this gas is present.
Lefebvre, Alexandre. "Analyses théorique, numérique et expérimentale de la détermination de la vitesse de combustion laminaire à partir de flammes en expansion sphériques." Thesis, Rouen, INSA, 2016. http://www.theses.fr/2016ISAM0009/document.
Full textEnvironmental and social challenges concerning the combustion of fossil fuels for energy production (electricity, building and transport) require the development of new combustion processes, new burner technologies and alternative fuels (gasification of biomass, biofuels, ...). Laminar burning velocity is one of the fundamental parameters used to characterize premixed combustion for these new fuels. This speed is a reference for the validation and improvement of kinetic schemes and an input parameter to estimate the turbulent burning velocity of most turbulent combustion codes. But even if it has been studied over 100 years, the precise experimental measurement of this velocity is still complicated due to inherent limitations in experimental configurations used, especially for high pressure and temperature conditions. In this context, this thesis work focuses on the study, analysis and characterization of the different techniques used to determine the laminar burning velocity from spherically expanding flames and proposes a reflection on the minimization of all possible uncertainty sources. This approach is achieved with confined spherical flames which allow to obtain high temperature and pressure initial conditions. In the first part, the formalism of existing laminar flame speeds in spherical expanding configuration is reminded to define the factors of uncertainty related to the experimental measurement (local kinematic and global kinetic variables). In particular, the effects associated with the estimation of the burned gases thermodynamic state, radiation and differential diffusion are discussed. In the second part, several numerical and experimental devices used in this thesis are presented. A study on four different experimental setups is proposed to analyze and characterize the uncertainties in the measurements and processing. Finally, in the third part, a rigorous definition of the consumption speed is proposed and a new methodology to measure it is developed. A complete validation based on numerical results is presented. Then uncertainties related to radiation, differential diffusion and extrapolation to zero stretch rate of measured data are detailed. This last step introduces a non-negligible bias and a new methodology to exploit raw data by a direct comparison with DNS reproducing the experiments is proposed
Broustail, Guillaume. "Potentiel de l’utilisation des mélanges hydrocarbures/alcools pour les moteurs à allumage commandé." Thesis, Orléans, 2011. http://www.theses.fr/2011ORLE2077/document.
Full textFor the past few years, the oil stock decrease encourages the different countries to increase their energy independence. Moreover, reducing the environmental impact of transportation became one of the priorities of our society. In this way, European emissions standards are stricter while several pollutants have been identified to have a negative impact on health and the environment. To answer this double problem, the use of alcohols biofuels in spark-ignition engines is one the promising ways. The European Union have already taken a small step in that direction by allowing a maximum of 10% of ethanol into gasoline. As well as ethanol is already marketed, Biobutanol, a 2nd generation biofuel, appears as a serious candidate with a strong potential for a spark-ignition engines use. The objective of this dissertation is to study the potential of the iso-octane/butanol blends use in spark-ignition engines, in terms of performance and pollutants emissions. Moreover, these results are compared to isooctane/ethanol blends. The heat release in spark-ignition engine is piloted for a part by laminar burning velocity. This characteristic was studied experimentally and numerically for different initial conditions (pressure and equivalence ratio) in a constant volume bomb. Then, the early flame kernel growth was studied in a spark-ignition single cylinder engine equipped with optical accesses. Those results were correlated with the results on the laminar burning velocity. Finally, regulated and non-regulated pollutants emissions and engine performance were investigated in a spark-ignition single cylinder engine. A decrease of most pollutant emissions was observed with both alcohols addition
Balusamy, Saravanan. "Etude expérimentale de la propagation de flammes dans un mélange stratifié." Phd thesis, INSA de Rouen, 2010. http://tel.archives-ouvertes.fr/tel-00557915.
Full textVarea, Emilien. "Experimental analysis of laminar spherically expanding flames." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00800616.
Full textBelerrajoul, Mohamed. "Modélisation multi-échelle de la combustion d'un nuage de particules." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0014/document.
Full textThe presence of fine particles of oxidizable materials is encountered in many industrial situations.The risk of dust explosion presents a constant threat in transformation industries that manufacture,use or manipulate powders or combustible materials dusts. In nuclear safety analysis, one of themain scenarios is the risk of graphite dust explosion that may occur during decommissioningoperations of Uranium Natural Graphite Gas reactors. The issue considered in this thesis isrelated to combustion of a dilute gas-particle mixture. This work aims at developing a macroscopicEuler-Lagrange model for predicting laminar flame velocity, which is one of the essential data forturbulent flame velocity models used to evaluate the risk of dust explosion. First, the macroscopicheat and mass transfer equations are derived using the volume averaging method. The majorinterest of the proposed approach is to provide closure problems that allow to estimate theeffective transport coefficients, such as heat exchange coefficients and the effective coefficient ofthe heterogeneous reaction. Second, Euler-Lagrange simulations are used to determine the planetwo-phase laminar flame velocity as a function of gas mixture and graphite dust characteristics.The proposed model is compared to the classical Euler-Lagrange model based on the resolutionof the boundary layer problem in the vicinity of an isolated particle in infinite medium. Results showthat the dilution rate and the indirect particle-particle exchanges are not systematically negligible inthe macroscopic exchanges between the two-phases. On the other hand, this study suggests thepotentiality of the proposed approach for detailed simulations of two-phase flow
Zhou, Jianxi. "Etude de l’effet du taux d’oxygène sur la combustion en moteur à allumage commandé suralimenté." Thesis, Orléans, 2013. http://www.theses.fr/2013ORLE2049/document.
Full textNowadays, car manufacturers continue to lead researches on new technologies facing to the energy shortage and pollutant emission problems. A major way to optimise fuel economy and reduce pollutant emissions for Spark-Ignition (SI) engines is the downsizing concept. However, this concept is unfortunately limited by ‘knock’ phenomena (abnormal combustion) due to high temperature and high pressure in-cylinder conditions. In the present study, control the oxygen concentration in air is proposed. Indeed, on the one hand, oxygen-enriched combustion can improve engine power density with the same intake pressure level. Thus, oxygen-enriched combustion can be used either as a booster to increase engine output or as a combustion enhancer when the engine operates at low loads or in cold start conditions. On the other hand, low oxygen concentration in air (or N2 dilution) can be considered as an alternative to exhaust gas recirculation (EGR). The experiments were carried out in a downsized single-cylinder SI engine with different rates of oxygen and equivalence ratios. The study of the impact of controlling oxygen concentration on the combustion characteristics and emissions was performed at several loads by optimizing the spark advance and the intake pressure to maintain the load and obtain a minimum value of indicated Specific Fuel Consumption (SFC). The effect of oxygen concentration on the engine combustion characteristics was simulated by using the commercial software AMESim, with the combustion model developed by IFP-EN. By implementing correlations for the laminar burning velocity, determined previously during this study, and auto-ignition delay data base, the in-cylinder pressures were perfectly calibrated with a maximum pressure relative error less than 2%, and the knock intensity was predicted
Chica, Cano Juan Pablo. "Etude de l'influence de la dilution à la vapeur d'eau H2O d'une flamme CH4/air enrichi en dioxygène O2. Combustion Optimisée pour le Captage de CO2." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR029/document.
Full textThis PhD thesis deals with the analysis of the effects of exhaust gas recirculation (EGR) through the study of the dilution by carbon dioxide and more particularly of the water steam on dioxygen enriched methane/air flames, in the case of a premixed pressurized combustion encountered in gas turbines. CH4/O2/H2O/N2 pressurized laminar burning velocity measurement were obtained using a spherical flame propagating freely in a closed chamber. The analysis of the experimental results made it possible to check the validity of the kinetic scheme GRIMech.3.0 through numerical calculations of one-dimensional free flames. Further calculations allowed the establishment of a database (laminar burning velocity, Markstein length and Lewis number, adiabatic combustion temperature and flame thickness) as a function of combustion input parameters (temperature, pressure, X(H2O), equivalence ratio and dioxygen enrichment). The additional experimental study under turbulent regime, the flames diluted with H2O and CO2 allowed to highlight the effect of the laminar burning velocity on the average structures and the stability of turbulent flames. It also allowed to analyze the parameters (adiabatic flame temperature, pressure, X(H2O), X(CO2), X(N2), laminar burning velocity) which have an important role in the production of CO pollutants and NO
Min, Jiesheng. "Comportement transitionnel et stabilisation de flammes-jets non-prémélangés de méthane dans un coflow d’air dilué en CO2." Thesis, Rouen, INSA, 2011. http://www.theses.fr/2011ISAM0005/document.
Full textThis work focuses on the understanding of the behaviours of non-premixed methane flame inside an air coflow diluted by carbon dyoxide (CO2) or by other chemically inert diluents in order to discriminate different phenomena involved in dilution. Transitional phenomena (liftoff and extinction) quantified trough the stability limits, are analyzed trough representative physical quantities. The flame stability domain is limited by 3D-surfaces (liftoff and extinction) in the physical domain (Qdiluant/Qair (dilution level), Uair (air velocity), UCH4 (methane velocity)) revealing a competitive effect between aerodynamics and dilution. Generic diagrams of flame liftoff and extinction are proposed for all the diluents. Physical quantities related to flame stabilization process are all submitted to, regardless of diluent, self-similar laws. This is explained by flame burning velocity which is considered as the key element in the flame stabilization mechanism with air-side dilution
de, Rooy S. C. "Improved efficiencies in flame weeding." Lincoln University, 1992. http://hdl.handle.net/10182/18.
Full textGrasreiner, Sebastian. "Combustion modeling for virtual SI engine calibration with the help of 0D/3D methods." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2012. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-90518.
Full textModerne Ottomotoren spielen heute sowohl in konventionellen als auch hybriden Fahrzeugantrieben eine große Rolle. Aktuelle Konzepte sind hochvariabel bezüglich Ventilsteuerung, Kraftstoffeinspritzung und Laststeuerung und ihre Optimierungspotentiale erwachsen zumeist aus neuen Softwarefunktionen. Deren Applikation ist zeit- und kostenintensiv und soll durch virtuelle Methoden unterstützt werden. In der vorliegenden Arbeit wird ein physikalisches 0D Verbrennungsmodell für Ottomotoren aufgebaut und bis zur praktischen Anwendung geführt. Dafür wurde zuerst die Thermodynamik echtzeitfähig modelliert und im gesamten Motorenkennfeld abgeglichen. Der Aufbau eines neuen Turbulenzmodells auf Basis der quasidimensionalen k-epsilon-Gleichung ermöglicht anschließend, die veränderlichen Einflüsse globaler Ladungsbewegung auf die Turbulenz abzubilden. Für den Brennverzug wurde ein vereinfachtes Modell abgeleitet, welches den Übergang von laminarer zu turbulenter Flammenausbreitung nach der Zündung in den Vordergrund stellt. Der restliche Brennverlauf wird durch die physikalische Ermittlung der turbulenten Brenngeschwindigkeit in einem 0D Entrainment-Ansatz dargestellt. Nach Validierung aller Teilmodelle erfolgt die virtuelle Bedatung der Momentenstruktur und der Abgastemperaturfunktion für das Motorsteuergerät
Shih, Hsin-Yu, and 施信宇. "Study of Burning Velocity inthe Combustion Chamber ofSI Engine." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/2t9ud4.
Full text逢甲大學
機械工程學所
91
Abstract Combustion process in an SI engine is very complex. Burning flame burning is premixed and turbulent. Flame propagation is spatial and unsteady. Factors affect the entire process are various, the best study is experimental research. In this experiment, a modified spark-ignition engine is applied. An acrylic cylinder head inserting five Photo-sensitive resistors and signal pick out circuit is located on a four-stroke single-cylinder engine block. Selecting liquefied petroleum gas or methane gas as fuel, the engine is motored by a variable velocity electrical motor mechanism and is fired by a magnet ignition system. The governing factors are air-fuel equivalence ratio, engine speed and inlet mixture temperature. Engine operating at various fuels, equivalence ratios, intake temperature and engine speeds have different burning flame velocity. For methane and LPG fueled, the maximum velocity occur during mixing stoichiometrically, the inlet temperature is in the range of 298K and 303K. Increasing engine speed, the mixing turbulence intensity is strengthened, the burning flame velocity increase.
Koroll, Grant W. "Burning velocity, structure and kinetics of hydrogen flames containing diluents." 1985. http://hdl.handle.net/1993/28830.
Full textMannaa, Ossama. "Burning Characteristics of Premixed Flames in Laminar and Turbulent Environments." Diss., 2018. http://hdl.handle.net/10754/630077.
Full textRallis, Costa John. "A critical evaluation of the spherical constant volume vessel method for determining laminar burning velocity." Thesis, 2015. http://hdl.handle.net/10539/18100.
Full textThe objectives of combustion research are considered and attention directed to laminar flames, the burning velocity of which is recognised as a basic parameter in all combustion problem s. Various methods of determining this property are critically reviewed and, as a result, it is concluded th at the spherical constant volume vessel technique is potentially one of the most versa tile and accurate. However this method does not appear to have been extensively used, probably because the available equations virtually relegate it to the status of a constant pressure technique
Yarasu, Ravindra Babu. "Premixed Turbulent Combustion Of Producer Gas In Closed Vessel And Engine Cylinder." Thesis, 2009. http://hdl.handle.net/2005/927.
Full textByun, Jung Joo. "Laminar burning velocities and laminar flame speeds of multi-component fuel blends at elevated temperatures and pressures." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-516.
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LIN, TZU-HAO, and 林子皓. "Evaluation on the dust explosion parameters and burning velocity mode with adipic acid, p-terephthalic acid, and powdered polyester resin." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/63620309098770107361.
Full text國立雲林科技大學
環境與安全衛生工程系
104
In the chemical industrial processes, dust explosion is a critical hazard in numerous manufacturings and storage facilities. When the explosion calamity happened, life and property must be paid out with huge economic costs, and the reputation of corporation will deteriorate. For this reason, how to prevent accidents is a significant issue. On this research, we focused on the product of polyester resin and main materials with adipic acid (AA) and p-terephthalic acid (PTA). All of the parameters can be obtained by a variety of measuring equipment. In regards to the physical parameters, particle size analyzer and thermogravimetry can provide the particle size and peak temperature (Tp). Regarding of chemical parameters, minimum ignition energy analyzer and 20-L apparatus are representative instruments for the explosion coefficient. According to the results, particle size have high correlation about the minimum ignition energy tests. In the explosion parameter tests, not only the particle size but also chemical structure should be considered. Regarding the forecast burning velocity, probing its correlation with explosion parameters is a important topic. Therefore, building up a safety as well as complete protection mechanisms is a significant issue.
Yuen, Frank Tat Cheong. "Experimental Investigation of the Dynamics and Structure of Lean-premixed Turbulent Combustion." Thesis, 2009. http://hdl.handle.net/1807/19306.
Full textLuo, Caimao. "Study on the inhibition mechanisms of CBrF₃, CF₃I and C₃F₇H in methane fuelled premixed flames." Thesis, 2010. http://hdl.handle.net/1959.13/805503.
Full textThis dissertation is focused on developing updated inhibition kinetics of hydrofluorocarbon (HFC), CBrF₃, CF₃I and C₃F₇H and modelling of inhibition phenomenon using the updated kinetic mechanism. The thesis is divided into three bodies of work: the first is presented in three chapters, which outlines the purpose of the study, a review of the relevant literature and numerical techniques developed and applied for kinetic analysis; the second part of the thesis involves updating CBrF₃, CF₃I and C₃HF₇ inhibition mechanisms while the final part applies the three updated kinetic mechanisms to specific applications. In the first section, the background of the study, the literature related to elementary reactions of hydrofluorocarbon (HFC), CBrF₃, CF₃I and C₃HF₇ inhibition mechanisms and numerical techniques used to obtain insight to the complicated kinetics of hydrocarbon flames inhibited by halon and halon alternatives are presented. In the second section of the thesis, based on comparing the burning velocity and flame structure of methane-air-CBrF₃ (or CF₃I or C₃F₇H) systems, the inhibition kinetics of CBrF₃, CF₃I and C₃F₇H are updated. At the same time, the inhibition mechanism based on Br, I or H atom flux, in addition to the more standard C atom flux, is assessed. The higher inhibition capability of the bromine or iodine containing compounds is assessed by identifying and analysing the inhibition cycles, by which the Br or I containing compounds are regenerated and enhance scavenging of radicals. Several inhibition cycles are revealed using the Br or I atom flux analysis. The third section of this dissertation pursues application of the inhibition mechanisms, which ultimately aims to solve specific fire-safety related problems. The first application is an assessment of the flame suppressing effect of combinations of CF₃I with hydrofluorocarbons (HFCs), such as C₃HF₇, C₂HF₅, CHF₃, and fluorocarbons (FCs), such as C₂F₆. The inhibition efficiency is divided into physical and chemical effects, with chemical influences decreasing once the agent concentration exceeds a specified value termed the agent saturation limit. An assessment of whether other suppressants will change the agent saturation limit and determine whether the combined chemistry or physical effects of two agents is coupled or uncoupled, whether or not the combined chemistry or thermal physics effect of two agents is independent each other, is presented. Finally, we determine whether or not the existence of other agent influences the chemical reaction inhibition pathways. Reaction pathway analysis based on C, I and F atom fluxes is used to explain these phenomena. The second application gives an explanation as to the apparent reverse suppressing effect of the CBrF₃ in inhibiting the methanol-fuelled flames compared to CF₃I. The major reactions responsible for this suppressing phenomenon are presented, and an explanation for the high suppression capability of CF₃I over CBrF₃ for methanol flame is presented. The third application investigates the evolution of toxic gases, such as CO, HBr, HF and HI in hot layers formed in enclosed fires mitigated with CBrF₃ and CF₃I. Both equilibrium and time-evolving concentrations of toxic gases were estimated. The effect of the global equivalence ratio, temperature of the hot layer, agent concentration on the toxic gases is studied by comparing the species evolution histories.
Richter, Sandra. "Charakterisierung grundlegender Verbrennungseigenschaften von alternativen Treibstoffen und Treibstoffkomponenten." 2018. https://tubaf.qucosa.de/id/qucosa%3A33893.
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