Journal of Combustion最新文献_第2页

The Modification of the Perforated Plate in the Fluidized-Bed Combustor to Analyze Heat Convection Rate and Temperature 对流化床燃烧室穿孔板的改进以分析热对流率和温度

IF 0.7

Journal of Combustion Pub Date : 2021-11-25 DOI: 10.1155/2021/4084162

Erdiwansyah, Mahidin, H. Husin, M. Faisal, Muhtadin, A. Gani, R. E. Sardjono, R. Mamat

{"title":"The Modification of the Perforated Plate in the Fluidized-Bed Combustor to Analyze Heat Convection Rate and Temperature","authors":"Erdiwansyah, Mahidin, H. Husin, M. Faisal, Muhtadin, A. Gani, R. E. Sardjono, R. Mamat","doi":"10.1155/2021/4084162","DOIUrl":"https://doi.org/10.1155/2021/4084162","url":null,"abstract":"Investigation of combustion temperature through experiments with a wide range of fuels, both solid and liquid, is continuously being conducted by scientists around the world, while the measurement of heat transfer rate can be analyzed when the combustion process occurs. Previous research has generally been conducted using liquefied gas, fossil fuels, and alcohol additives. Specifically, the research in this work investigated the convection heat rate and combustion temperature through the modification of the perforated plate. The experiment was conducted in the fluidized-bed combustor (FBC) fuel chamber using solid waste fuel of oil palm biomass. Measurements were performed at four different points using the HotTemp HT-306 Digital Thermometer. The results of the experiment showed that the convection heat rate in measurement one (M-I) reached 8.258 W/m2 for palm kernel shell (PKS) fuel. Meanwhile, in measurement two (M-II), the convection rate of 7.392 W/m2 was produced by oil palm midrib (OPM) fuel. The highest combustion temperature was recorded with OPM fuel (884°C) at M-I. However, the combustion temperature of the PKS combustion process is higher at 896°C but shows a less good trend than OPM. Overall, the measurement results of the three types of fuel used to modify the perforated plate applied in the FBC fuel chamber are excellent. It can be proven that the fuel is put into the combustion chamber with nothing left.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"3 2 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83479874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Combustion Characteristics and NO Formation Characteristics Modeling in a Compression Ignition Engine Fuelled with Diesel Fuel and Biofuel 以柴油和生物燃料为燃料的压缩点火发动机的燃烧特性和NO形成特性建模

IF 0.7

Journal of Combustion Pub Date : 2021-11-18 DOI: 10.1155/2021/7111040

Jean Paul Gram Shou, M. Obounou, Rita Enoh Tchame, Mahamat Hassane Babikir, T. Kofané

{"title":"Combustion Characteristics and NO Formation Characteristics Modeling in a Compression Ignition Engine Fuelled with Diesel Fuel and Biofuel","authors":"Jean Paul Gram Shou, M. Obounou, Rita Enoh Tchame, Mahamat Hassane Babikir, T. Kofané","doi":"10.1155/2021/7111040","DOIUrl":"https://doi.org/10.1155/2021/7111040","url":null,"abstract":"Compression ignition engine modeling draws great attention due to its high efficiency. However, it is still very difficult to model compression ignition engine due to its complex combustion phenomena. In this work, we perform a theoretical study of steam injection being applied into a single-cylinder four-strokes direct-injection and naturally aspirated compression ignition engine running with diesel and biodiesel fuels in order to improve the performance and reduce NO emissions by using a two-zone thermodynamic combustion model. The results obtained from biodiesel fuel are compared with the ones of diesel fuel in terms of performance, adiabatic flame temperatures, and NO emissions. The steam injection method could decrease NO emissions and improve the engine performances. The results showed that the NO formation characteristics considerably decreased and the performance significantly increased with the steam injection method. The relative errors for computed nitric oxide concentration values of biodiesel fuel and diesel fuel in comparison to the measured ones are 2.8% and 1.6%, respectively. The experimental and theoretical results observed show the highly satisfactory coincidences.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"94 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79445392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Combustion Characteristics of Mui and Taru Basin Coal in a Fluidized Bed Combustor 梅和塔鲁盆地煤在流化床燃烧器中的燃烧特性

IF 0.7

Journal of Combustion Pub Date : 2021-05-26 DOI: 10.1155/2021/6647875

Brian Ondari, Z. Siagi, Anil Kumar

{"title":"Combustion Characteristics of Mui and Taru Basin Coal in a Fluidized Bed Combustor","authors":"Brian Ondari, Z. Siagi, Anil Kumar","doi":"10.1155/2021/6647875","DOIUrl":"https://doi.org/10.1155/2021/6647875","url":null,"abstract":"Coal reserves at Mui and Taru in Kitui and Kilifi counties in Kenya are estimated to provide over 400 million tons. Being new discoveries, their properties were investigated using the ASTM standards, while the combustion characteristics were studied in a fluidized bed combustor (FBC). Proximate analyses of the Mui1, Mui2, and Taru coal samples were as follows: moisture content 3.75, 5.48, and 3.53%; volatile matter 59.25, 58.05, and 55.10%; ash content 9.25, 11.48, and 24.63%; and fixed carbon 27.80, 25.00, and 16.75%, respectively. Ultimate analysis for Mui1, Mui2, and Taru coal samples is as follows: sulphur wt.% 1.94, 1.89, and 1.07; carbon 65.68, 60.98, and 51.10%; hydrogen 5.97, 5.70, and 5.09%; nitrogen 0.92, 0.94, and 1.00%; and oxygen 11.62, 12.33, and 11.13%, respectively. Temperature–weight loss analysis showed that for Mui and Taru basin coal, devolatilization starts at 200°C and 250°C, and combustion was complete at 750°C and 650°C, respectively. The maximum temperature obtained in FBC was 855°C at 700 mm height, just above the point of fuel feed, while the minimum was 440°C at height of 2230 mm. Maximum pressure drop was 1.02 mbars at 150 mm, while minimum was 0.67 mbars at 700 mm from the base. Gross calorific values were Mui1 coal, 27090 kJ/kg (grade A), Mui2 coal, 25196 kJ/kg (grade B), and the Taru coal, 21016 kJ/kg (grade C). Flue gas analysis for Taru and Mui coal gave hydrogen sulfide as 20 ppm and 6 ppm, maximum carbon monoxide of 2000 ppm at 600°C, and a decrease in oxygen as combustion progressed to a minimum of 15%, followed by an increase to 20.3%, suggesting depletion of coal. Based on the findings, the coal samples were suitable for commercial use.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"21 1","pages":"1-8"},"PeriodicalIF":0.7,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84993494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiphysical Models for Hydrogen Production Using NaOH and Stainless Steel Electrodes in Alkaline Electrolysis Cell 碱性电解池中使用NaOH和不锈钢电极制氢的多物理模型

IF 0.7

Journal of Combustion Pub Date : 2021-03-19 DOI: 10.1155/2021/6673494

Ivan Newen Aquigeh, Merlin Zacharie Ayissi, D. Bitondo

{"title":"Multiphysical Models for Hydrogen Production Using NaOH and Stainless Steel Electrodes in Alkaline Electrolysis Cell","authors":"Ivan Newen Aquigeh, Merlin Zacharie Ayissi, D. Bitondo","doi":"10.1155/2021/6673494","DOIUrl":"https://doi.org/10.1155/2021/6673494","url":null,"abstract":"The cell voltage in alkaline water electrolysis cells remains high despite the fact that water electrolysis is a cleaner and simpler method of hydrogen production. A multiphysical model for the cell voltage of a single cell electrolyzer was realized based on a combination of current-voltage models, simulation of electrolyzers in intermittent operation (SIMELINT), existing experimental data, and data from the experiment conducted in the course of this work. The equipment used NaOH as supporting electrolyte and stainless steel as electrodes. Different electrolyte concentrations, interelectrode gaps, and electrolyte types were applied and the cell voltages recorded. Concentrations of 60 wt% NaOH produced lowest range of cell voltage (1.15–2.67 V); an interelectrode gap of 0.5 cm also presented the lowest cell voltage (1.14–2.71 V). The distilled water from air conditioning led to a minimum cell voltage (1.18–2.78 V). The water from a factory presented the highest flow rate (12.48 × 10−1cm3/min). It was found that the cell voltage of the alkaline electrolyzer was reduced considerably by reducing the interelectrode gap to 0.5 cm and using electrolytes that produce less bubbles. A maximum error of 1.5% was found between the mathematical model and experimental model, indicating that the model is reliable.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"141 1","pages":"1-11"},"PeriodicalIF":0.7,"publicationDate":"2021-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74731278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

A Detailed Numerical Study of NOx Kinetics in Counterflow Methane Diffusion Flames: Effects of Fuel-Side versus Oxidizer-Side Dilution 逆流甲烷扩散火焰中NOx动力学的详细数值研究:燃料侧与氧化剂侧稀释的影响

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Journal of Combustion Pub Date : 2021-03-03 DOI: 10.1155/2021/6642734

Huanhuan Xu, Fengshan Liu, Zhiqiang Wang, Xiaohan Ren, Juan Chen, Qiang Li, Zilin Zhu

{"title":"A Detailed Numerical Study of NOx Kinetics in Counterflow Methane Diffusion Flames: Effects of Fuel-Side versus Oxidizer-Side Dilution","authors":"Huanhuan Xu, Fengshan Liu, Zhiqiang Wang, Xiaohan Ren, Juan Chen, Qiang Li, Zilin Zhu","doi":"10.1155/2021/6642734","DOIUrl":"https://doi.org/10.1155/2021/6642734","url":null,"abstract":"Dilution combustion has been widely utilized due to various merits, such as enhanced efficiency, fewer pollutants emissions, and even a promising future in alleviating global warming. Diluents can be introduced through the oxidizer or fuel side to achieve the desired combustion properties, and H2O and CO2 are the most common ones. A comprehensive comparison between the different dilution methods still lacks understanding and optimizes the dilution combustion technologies. This study numerically compared the effects of H2O and CO2 dilution in the oxidizer or fuel stream on counterflow methane diffusion flames, emphasizing NO formation kinetics. Results showed that the impact of different radiation heat transfer models on NO emissions diminishes with increasing the dilution ratio. The calculations of radiation heat transfer were treated in three ways: radiation-neglected, optically thin, and using a nongrey radiation model. When keeping the oxygen content and methane fraction constant, CO2 dilution in the air-side has the most profound influence on NO reduction, and CO2 dilution in the fuel-side has the least. H2O dilution showed a medium impact with a larger degree on air-side than that on fuel-side. To gain a deeper understanding of this effect order, the contributions of different NO formation routes were quantified, and analyses were made based on the diluents’ chemical and thermal effects. It was found that the oxidizer-side dilution and fuel-side dilution affect the NO formation pathway similarly. Still, the influence of H2O dilution on the NO formation pathway differs from that of CO2 dilution.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"79 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79065058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Experimental Study of the Effect of Confining on the Development of Fire in a Closed Compartment 密闭隔间内围合对火势发展影响的实验研究

IF 0.7

Journal of Combustion Pub Date : 2021-02-12 DOI: 10.1155/2021/6662830

Fidel Meskéoulé Vondou, Claude Valery Ngayihi Abbe, J. Zaida, Philippe Onguene Mvogo, R. Mouangue

{"title":"Experimental Study of the Effect of Confining on the Development of Fire in a Closed Compartment","authors":"Fidel Meskéoulé Vondou, Claude Valery Ngayihi Abbe, J. Zaida, Philippe Onguene Mvogo, R. Mouangue","doi":"10.1155/2021/6662830","DOIUrl":"https://doi.org/10.1155/2021/6662830","url":null,"abstract":"Backdraft is a complex phenomenon which occurs during cases of confined fires. It appears by a fast deflagration which occurs after the introduction of oxygen into a compartment filled with hot gases rich in unburned combustible vapor. Practically, this situation could occur at the time of intervention of firemen who break the door or when a window breaks under the action of thermal stresses. Based on a strong experimental campaign, the present paper aimed to make a quantitative investigation of the effect of confining on a totally closed fire. With this focus, fire tests were carried out in a completely closed room of dimensions 1.20 m × 1.20 m × 1.02 m, with five sources of fire of different heat release rates. The same fire sources were also tested in a free atmosphere in order to get reference data. After a statistical study of data, a comparative analysis between both results has been done. Its outcome is that confining has a major impact on the quality of combustion and on the fire duration. More precisely, it has been noticed comparatively to fire tests in free atmosphere that confining increases the fire duration by 14.85 percent while it decreases the heat release rate by 21.72 percent.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"25 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80796881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Nanoemulsion Fuel Additive Used as a Diesel Combustion Catalyst 用作柴油燃烧催化剂的纳米乳液燃料添加剂

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Journal of Combustion Pub Date : 2020-07-18 DOI: 10.1155/2020/8837969

Richard Hicks

{"title":"Nanoemulsion Fuel Additive Used as a Diesel Combustion Catalyst","authors":"Richard Hicks","doi":"10.1155/2020/8837969","DOIUrl":"https://doi.org/10.1155/2020/8837969","url":null,"abstract":"This research article discloses how a uniquely structured fuel additive can easily be mixed with commercially available diesel fuel to produce an extremely stable nanoemulsion fuel. Even when using an ultralow dose (125 ppm), the additive still creates a large and catalytically active surface area using billions of nanosized water droplets (4 nanometers). No metallic or organometallic compounds were used. When used in heavy duty diesel engines, treated fuel significantly improves vehicle fuel economy. Extensive verification testing was carried out using multiple fleets of heavy duty diesel trucks operating for up to two years under “real-world” driving conditions. Testing used 538 heavy duty trucks and 15 different vehicle fleets. Test vehicles used 475,000 litres of treated fuel and covered a total of 14 million kilometres. Fleet testing was supervised by one of the premier European testing agencies (TNO Quality Services BV). Raw fuel economy data was collected and analyzed by an independent consulting agency andd showed a combined average weighted fuel savings of 9.7%. Diesel engine CO2 emissions are one of the many contributory causes of global warming. Unfortunately, new engine fuel economy technologies can take 10 years to have a 50% impact (typically 5% per year, as older vehicles are slowly replaced with new models). However, using the additive would immediately improve the combustion properties of fuel being used in these vehicles with the potential to reach up to 90% of the entire diesel vehicle population within about 60 days.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"18 1","pages":"1-6"},"PeriodicalIF":0.7,"publicationDate":"2020-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90073919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Large Eddy Simulation of a Turbulent Spray Jet Flame Using Filtered Tabulated Chemistry 用过滤制表化学法模拟湍流喷射火焰的大涡

IF 0.7

Journal of Combustion Pub Date : 2020-03-19 DOI: 10.1155/2020/2764523

Adrien Chatelier, B. Fiorina, V. Moureau, N. Bertier

{"title":"Large Eddy Simulation of a Turbulent Spray Jet Flame Using Filtered Tabulated Chemistry","authors":"Adrien Chatelier, B. Fiorina, V. Moureau, N. Bertier","doi":"10.1155/2020/2764523","DOIUrl":"https://doi.org/10.1155/2020/2764523","url":null,"abstract":"This work presents Large Eddy Simulations of the unconfined CORIA Rouen Spray Burner, fed with liquid n-heptane and air. Turbulent combustion modeling is based on the Filtered TAbulated Chemistry model for LES (F-TACLES) formalism, designed to capture the propagation speed of turbulent stratified flames. Initially dedicated to gaseous combustion, the filtered flamelet model is challenged for the first time in a turbulent spray flame configuration. Two meshes are employed. The finest grid, where both flame thickness and wrinkling are resolved, aims to challenge the chemistry tabulation procedure. At the opposite the coarse mesh does not allow full resolution of the flame thickness and exhibits significant unresolved contributions of subgrid scale flame wrinkling. Both LES solutions are extensively compared against experimental data. For both nonreacting and reacting conditions, the flow and spray aerodynamical properties are well captured by the two simulations. More interesting, the LES predicts accurately the flame lift-off height for both fine and coarse grid conditions. It confirms that the modeling methodology is able to capture the filtered turbulent flame propagation speed in a two-phase flow environment and within grid conditions representative of practical applications. Differences, observed for the droplet temperature, seem related to the evaporation model assumptions.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"8 1","pages":"1-23"},"PeriodicalIF":0.7,"publicationDate":"2020-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86205937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Experimental Investigation of the Continuous Transition of Flame-Spreading near the Blow-Off Limit 吹灭极限附近火焰蔓延连续过渡的实验研究

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Journal of Combustion Pub Date : 2020-02-19 DOI: 10.1155/2020/3187694

K. Komizu, Y. Saito, A. Tsuji, H. Nagata

引用次数: 1

Experimental Study on Fire Behaviour in Room following the Disposition of Openings 开口布置后室内火灾行为的实验研究

IF 0.7

Journal of Combustion Pub Date : 2020-02-01 DOI: 10.1155/2020/9385712

Fidel Meskéoulé Vondou, Claude Valery Ngayihi Abbe, Justin Tégawendé Zaida, Philippe Onguene Mvogo, R. Mouangue

{"title":"Experimental Study on Fire Behaviour in Room following the Disposition of Openings","authors":"Fidel Meskéoulé Vondou, Claude Valery Ngayihi Abbe, Justin Tégawendé Zaida, Philippe Onguene Mvogo, R. Mouangue","doi":"10.1155/2020/9385712","DOIUrl":"https://doi.org/10.1155/2020/9385712","url":null,"abstract":"Many experiments have been done by authors to study the influence of the natural ventilation through openings on fire behaviour in compartments. It has been revealed that fire will be influenced by the size of existing openings which can be an open window, an open door, or both of them. Concerning the last case, the literature does not give any information about the impact of the arrangement of these openings on the behaviour of fire. The present paper aims then to carry out a comparative study of the disposition of the window compared to the door, on the behaviour of fire in a compartment. To achieve that objective, fire experiments were conducted in a reduced scale room of dimensions 1.20 m 1.20 m 1.02 m, which can be modulated into two configurations. The first one named “PFC configuration” is the case where the open door and the open window are in nonopposite walls. The second one named “PFO configuration” is the case where these both openings are in opposite walls. After having performed several fire tests in both configurations using the same amount of diesel fuel as fire source, results revealed that the fuel burns faster in the PFC configuration compared to that in the PFO configuration. This is due to a global mass loss rate of against , respectively. Beyond a difference of 20°C observed on the maximal temperature of burned gases located at ceiling, results also revealed the production of ghosting flames in the PFO configuration.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":"42 1","pages":"1-11"},"PeriodicalIF":0.7,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80738098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5