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Dissertations / Theses on the topic 'Impinging flame'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Wang, Aijuan. "Experimental and numerical investigation of the confinement effect on the impinging flame in a compartment." Electronic Thesis or Diss., Bourges, INSA Centre Val de Loire, 2021. http://www.theses.fr/2021ISAB0002.

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Le phénomène de flamme de diffusion impactant une paroi est fréquent dans les scénarios d’incendie en milieu clos. Celui-ci peut entraîner à avoir des conséquences désastreuses en termes de vie humaine et de biens matériels. En effet, lorsqu'une flamme incidente se produit dans un compartiment, elle peut augmenter le risque de propagation du feu de celui-ci vers une autre pièce à travers une explosion de fumée représentant une menace pour les personnes pié-gées. Afin d’apporter des éléments de compréhension sur le comportement de ce type de flamme, de nombreuses études ont réalisé. Celles-ci s

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2

Asgyer, Abulkasem A. "Turbulent premixed impinging flames." Thesis, University of Manchester, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488202.

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3

Abdullatif, Tawfik A. "Turbulent diffusion impinging flames." Thesis, University of Manchester, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488402.

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4

Chien, Yu-Chien. "Electrical Aspects of Impinging Flames." Thesis, University of California, Irvine, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3682710.

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<p> This dissertation examines the use of electric fields as one mechanism for controlling combustion as flames are partially extinguished when impinging on nearby surfaces. Electrical aspects of flames, specifically, the production of chemi-ions in hydrocarbon flames and the use of convective flows driven by these ions, have been investigated in a wide range of applications in prior work but despite this fairly comprehensive effort to study electrical aspects of combustion, relatively little research has focused on electrical phenomena near flame extinguishment, nor for flames near impingemen

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5

Virk, Akashdeep Singh. "Heat Transfer Characterization in Jet Flames Impinging on Flat Plates." Thesis, Virginia Tech, 2015. http://hdl.handle.net/10919/52985.

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The experimental work involves calculation of radial distribution of heat transfer coefficient at the surface of a flat Aluminium plate being impinged by a turbulent flame jet. Heat transfer coefficient distribution at the surface is computed from the measured heat flux and temperature data using a reference method and a slope method. The heat transfer coefficient (h) has a nearly bell shaped radial distribution at the plate surface for H/d =3.3. The value of h drops by 37 % from r/d =0 to r/d= 2. Upon increasing the axial distance to H/d = 5, the stagnation point h decreased by 15%. Adiabati

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6

Bergthorson, Jeffrey Myles Dimotakis Paul E. "Experiments and modeling of impinging jets and premixed hydrocarbon stagnation flames /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-05242005-165713.

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7

Wasson, Rachel Ann. "Separation of the Heat Transfer Components for Diffusion Flames Impinging onto Ceilings." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50588.

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Two series of experiments were performed to determine the flow characteristics and to quantify the heat transfer components from a propane diffusion flame impinging onto a ceiling. A 0.3 m square sand burner with propane as the fuel type provided a steady-state fire. In the first series of experiments, measurements of gas temperature and velocity were made at 76 mm vertical intervals above the burner up to the ceiling. Fire heat release rates (HRRs) of 50 kW and 90 kW with free flame length to ceiling height ratios, Lf/H, of 2, 1.5, 1, 0.8, 0.85 were used to determine their effects on the m

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8

McDaid, Chloe. "Developing and implementing advanced optical diagnostics for the investigation of fuel and flow effects on impinging jet flames." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/5166/.

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Experimental diagnostic techniques have been utilised and developed to investigate the flame wall interaction for impinging flames of propane, methane, hydrogen and syngas. Thermal imaging has been used to evaluate the plate temperatures and radiation losses at steady state. A methodology has been developed for temperature dependent emissivity materials. Schlieren and direct imaging have been used to visualise flame shapes and flow structure. A methodology has been developed to quantify the relative effects of visual turbulent structures on the flame wall interaction. High speed schlieren has

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9

Wen, Ming-Houng, and 溫明晃. "A study on Jet Impinging Flame." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/06516648712659137193.

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碩士<br>元智大學<br>機械工程研究所<br>87<br>The structures of the jet impinging flame are observed under different impinging angles, Renolds number and fuel dilution. The impinging flame of methane fuel is therefore constructed at the stagnation plane. This simple mechanism may reduce the combustion length and the combustion efficiency. But there is a high temperature flashback in the root of flame. When the Renolds number increase, the temperature of impinging flame reduce at the stagnation point and the combustion efficiency increase. Along with the ration of volume nitrogen and volume methane

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10

Shu, Ke-Neng, and 徐可能. "A Study on Impinging Angle Effect on Jet-to-Jet Impinging Pulsation Flame." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/04022024674672860663.

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碩士<br>元智大學<br>機械工程研究所<br>89<br>Experimental investigations on the pulsating jet-impinging diffusion flame were executed. A solenoid valve was aligned upstream of the jet orifice and the methane fuel and the outlet-field condition were controlled in open-closed cycles from 2 Hz to 17 Hz. By changing some parameters such as impinging angle, outlet fuel Renault Number and fuel supplying pulsation frequencies, to confer the changing of the temperature contours of a impinging jet diffusion flame. Results show that a solenoid which is the impinging jet flame source supplying a regular disturbing fou

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11

Yee, Hao-Dar, and 何達義. "A Study on Obverse Jet Impinging Diffuse Flame." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/95302834190496209687.

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碩士<br>元智大學<br>機械工程研究所<br>88<br>The experiments invest major on the reverse jet-pumping diffusion flame of burning phenomenon by using equal-mass-fluid-rate to observe the methane fuel and forbid burn nitric of face-to-face-pump phenomenon. And observe the penetration flame configuration change each other with control fuel-fluid-rate. Because forbid burn nitric has the character of endothermic and forbid burn. So, in observing face-to-face-pump of the methane fuel and forbid burn nitric of isothermal pictures , we can be from the change of flames temperature finding out the penetrating depth of

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12

Cheng, Chia-Chun, and 鄭家俊. "A Study on Impinging Diffusion Flame by Pulsation." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/86767884630233042144.

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碩士<br>元智大學<br>機械工程研究所<br>88<br>Experimental investigations on the pulsating jet-impinging diffusion flame were executed. A solenoid valve was aligned upstream of the jet orifice and the methane fuel was controlled in open-closed cycles from 2 Hz to 17 Hz. Results show that the open-closed cycles indeed increase the fluctuations of the methane fuel obviously. The evolutions of pulsating flame therefore develop faster than the continuous impinging flame. The optimized pulsating frequencies are near 9 to 11 Hz from the Re = 97 to 161. The temperature differences between that under optimized pulsa

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13

Chiu, Po-Ping, and 邱柏評. "Flame Feature of Premixed Propane Flame on a V-Shaped Circular Impinging Burner." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9k97xb.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>105<br>In this work, the innovative burner with v-shaped circular impinging structure was proposed. An experimental study was conducted to investigate the influence of burner structure on the feature of premixed propane flame. The design applied in the burner may reduce the consumption of fuel and improve the performance simultaneously. There are two main sections in this thesis. Firstly, the superior performance was verified through the comparison between v-shaped circular impinging burner and circular planar burner. The v-shaped circular impinging structure was be

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14

Yuan, Tsai Meng, and 蔡孟原. "A Study on Impinging Diffusion Flame with Splash Plate." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/48905702810642760271.

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碩士<br>元智大學<br>機械工程學系<br>93<br>A Study on Impinging diffusion Flame with Splash Plate Student：Meng-Yuan Tsai Advisors：Dr. Ay Su Institute of Mechanical Engineering Yuan-Ze University ABSTRACT The objective of this study is to enhance the combustion efficiency of the one-direction and reciprocal jet impinging flames by using different splash plates and regulating the locations of splash plates and nozzles at various momentum ratios and Reynolds numbers. To investigate the combustion efficiency, a splash plate was installed

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15

Shu-Ching, Chiang, and 蔣淑卿. "Turbulent Flame Structure of Impinging Burners with Hybrid Injection Ports." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/32569419445726228302.

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16

Lian-Haw, Yu, and 于連浩. "The experimental study of droplets impinging on the metal surface and flame." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/87657400216274607955.

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碩士<br>中正理工學院<br>兵器系統工程研究所<br>88<br>The objective of the study is to observe phenomenon of impacted metal surface and fire suppression and fire extinguishment by droplet impingement. The first part is to observe phenomenon of impacted metal surface by droplet impingement. The objective of the present work is systematically to study the effects of flow property and surface characteristic on the fluid dynamic by employing the high-speed CCD camera techniques and experimental measurements. The experimental work is unique in that the droplet impact factor is systematically rated in different non-d

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17

Mo, Shang-Hsuan, and 莫尚軒. "The Effect of CO Addition on Combustion Mechanisms of Impinging Propane Flame." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74071346690544249816.

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碩士<br>國立臺灣大學<br>機械工程學研究所<br>101<br>The mechanisms of lean combustion of propane with/without CO addition on a V-shaped burner have been investigated through the analysis of both flow and combustion fields. The flame patterns and flame temperatures under different mixing conditions were measured and recorded. Moreover, the measurement of chemiluminescence and the flow visualization were applied to obtain the distributions of C2* and CH* intensity, and flow velocity, respectively, during the combustion process. Also, the exhaust gas was analyzed in order to identify the participation of CO in th

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18

Chiu, Chih-Pin, and 邱志斌. "Characteristics of Reacting-Flow and Combustion of Syngas/alkane Premixed Impinging Flame." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/355g28.

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博士<br>國立臺灣大學<br>機械工程學研究所<br>106<br>Abstract Syngas, a clean and alternative fuel, has a great potential to replace hydrocarbon fuels in combustion applications. An impinging flow field has attracted interest in the investigation of its mixing characteristics of fuel and oxidant in many fuel-injection systems, but up to now the research on jet-impinging flames has been focused mainly on diffusion flames with hydrocarbon fuels. For a practical application, we therefore propose a concept of clean combustion through combining the advantages of syngas and an impinging burner. Furthermore, the varie

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19

Chung-WeiCheng and 鄭仲洧. "Flame Transition and Impact Analysis of a Burning Drop Impinging onto a Hot Plate." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/38764978244415806833.

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碩士<br>國立成功大學<br>機械工程學系碩博士班<br>100<br>This investigation explores the flame transition process and impinging phenomenon of a burning dodecane drop in a convective high-temperature gaseous environment. In the experiment, the plate was inserted at three different positions in the high-temperature flow. And the temperature of the impinging plate was 720, 509 or 407 (oC). The drop diameter ranged from 400 to 1400 μm. Weber number ranged from 150 to 1800. A stream of burning dodecane drops moved with the high-temperature gaseous flow and impinged onto the plate. By changing the drop diameter, the We

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20

Tseng, Yu-Hsun, and 曾俞勲. "The Effect of Momentum Ratio to the Combustion Efficiency in Un-like Jet Impinging Diffusion Flame." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/13578706452863057536.

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碩士<br>元智大學<br>機械工程學系<br>92<br>Abstract The research is to study the effect of jet momentum ratio to the combustion efficiency in unlike jet impinging diffusion flame. In the set-up, one of the methane tubes is substituted by the air, by adjusting the momentum ratio to observe the flame structure and measure the flame temperature to determine the efficiency. In addition, an infrared economizer is added to the methane tube to compare the difference. The impinging angle is fixed at 72.5 degrees. By changing the fuel supply rate, momentum ratio between air and methane and eco

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21

Hsieh, Wei-Dong, and 謝煒東. "Flames in a Jet Impinging onto a Wall." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/43358947909168963394.

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博士<br>國立成功大學<br>機械工程學系碩博士班<br>92<br>This investigation is aimed at studying the characteristics of laminar conical premixed flames in an impinging jet flow experimentally, numerically, and theoretically with emphasis on the effects of negative flame stretch from flame curvature, positive stretch from the flow field and preferential diffusion. 　　The results show that flame shapes exhibit double-solution characteristics in a certain range of methane concentration. Experimentally, by following different paths of adjusting methane concentration (decreasing from rich to lean or increasing from lean

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22

Bergthorson, Jeffrey Myles. "Experiments and Modeling of Impinging Jets and Premixed Hydrocarbon Stagnation Flames." Thesis, 2005. https://thesis.library.caltech.edu/2004/12/index.html.

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<p>To model the combustion of long-chain hydrocarbon fuels, an accurate kinetics mechanism must first be developed for the oxidation of small hydrocarbons, such as methane, ethane, and ethylene. Even for methane, a generally accepted mechanism is still elusive due to a lack of kinetically independent experimental data. In this work, a combined experimental and modeling technique is developed to validate and further optimize these mechanisms. This technique relies on detailed measurements of strained flames in a jet-wall stagnation flow using simultaneous Particle Streak Velocimetry (PSV) and

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23

Subhash, Chander. "Heat transfer charcteristics of laminar methane/air flames impingig on flat and cylindrical surfaces." Thesis, 2006. http://localhost:8080/iit/handle/2074/5177.

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