Journal of Combustion最新文献_第8页

Pyrolysis Kinetic Modelling of Wheat Straw from the Pannonian Region 潘诺尼亚地区小麦秸秆热解动力学模型

IF 0.7

Journal of Combustion Pub Date : 2016-04-03 DOI: 10.1155/2016/9534063

I. Pešenjanski, B. Miljković, Marija Vičević

{"title":"Pyrolysis Kinetic Modelling of Wheat Straw from the Pannonian Region","authors":"I. Pešenjanski, B. Miljković, Marija Vičević","doi":"10.1155/2016/9534063","DOIUrl":"https://doi.org/10.1155/2016/9534063","url":null,"abstract":"The pyrolysis/devolatilization is a basic step of thermochemical processes and requires fundamental characterization. In this paper, the kinetic model of pyrolysis is specified as a one-step global reaction. This type of reaction is used to describe the thermal degradation of wheat straw samples by measuring rates of mass loss of solid matter at a linear increase in temperature. The mentioned experiments were carried out using a derivatograph in an open-air environment. The influence of different factors was investigated, such as particle size, humidity levels, and the heating rate in the kinetics of devolatilization. As the measured values of mass loss and temperature functions transform in Arrhenius coordinates, the results are shown in the form of saddle curves. Such characteristics cannot be approximated with one equation in the form of Arrhenius law. For use in numerical applications, transformed functions can be approximated by linear regression for three separate intervals. Analysis of measurement resulting in granulation and moisture content variations shows that these factors have no significant influence. Tests of heating rate variations confirm the significance of this impact, especially in warmer regions. The influence of this factor should be more precisely investigated as a general variable, which should be the topic of further experiments.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74763353","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

Ignition by Hot Transient Jets in Confined Mixtures of Gaseous Fuels and Air 热瞬态射流在气体燃料和空气的密闭混合物中的点火

IF 0.7

Journal of Combustion Pub Date : 2016-03-27 DOI: 10.1155/2016/9565839

Abdullah Karimi, M. Nalim

{"title":"Ignition by Hot Transient Jets in Confined Mixtures of Gaseous Fuels and Air","authors":"Abdullah Karimi, M. Nalim","doi":"10.1155/2016/9565839","DOIUrl":"https://doi.org/10.1155/2016/9565839","url":null,"abstract":"Ignition of a combustible mixture by a transient jet of hot reactive gas is important for safety of mines, prechamber ignition in IC engines, detonation initiation, and novel constant-volume combustors. The present work is a numerical study of the hot jet ignition process in a long constant-volume combustor (CVC) that represents a wave rotor channel. The hot jet of combustion products from a prechamber is injected through a converging nozzle into the main CVC chamber containing a premixed fuel-air mixture. Combustion in a two-dimensional analogue of the CVC chamber is modeled using a global reaction mechanism, a skeletal mechanism, or a detailed reaction mechanism for three hydrocarbon fuels: methane, propane, and ethylene. Turbulence is modeled using the two-equation SST -ω model, and each reaction rate is limited by the local turbulent mixing timescale. Hybrid turbulent-kinetic schemes using some skeletal reaction mechanisms and detailed mechanisms are good predictors of the experimental data. Shock wave traverse of the reaction zone is seen to significantly increase the overall reaction rate, likely due to compression heating, as well as baroclinic vorticity generation that stirs and mixes reactants and increases flame area. Less easily ignitable methane mixture is found to show slower initial reaction and greater dependence on shock interaction than propane and ethylene.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85789963","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

The Effect of Injection Timings on Performance and Emissions of Compressed Natural-Gas Direct Injection Engine 喷射正时对压缩天然气直喷发动机性能和排放的影响

IF 0.7

Journal of Combustion Pub Date : 2016-03-24 DOI: 10.1155/2016/6501462

Saad Aljamali, S. Abdullah, W. M. Mahmood, Y. Ali

引用次数: 7

NOx, Soot, and Fuel Consumption Predictions under Transient Operating Cycle for Common Rail High Power Density Diesel Engines 共轨高功率密度柴油机瞬态运行周期下的氮氧化物、烟尘和燃料消耗预测

IF 0.7

Journal of Combustion Pub Date : 2016-03-24 DOI: 10.1155/2016/1374768

N. Walke, M. R. Nandgaonkar, N. V. Marathe

{"title":"NOx, Soot, and Fuel Consumption Predictions under Transient Operating Cycle for Common Rail High Power Density Diesel Engines","authors":"N. Walke, M. R. Nandgaonkar, N. V. Marathe","doi":"10.1155/2016/1374768","DOIUrl":"https://doi.org/10.1155/2016/1374768","url":null,"abstract":"Diesel engine is presently facing the challenge of controlling NOx and soot emissions on transient cycles, to meet stricter emission norms and to control emissions during field operations. Development of a simulation tool for NOx and soot emissions prediction on transient operating cycles has become the most important objective, which can significantly reduce the experimentation time and cost required for tuning these emissions. Hence, in this work, a 0D comprehensive predictive model has been formulated with selection and coupling of appropriate combustion and emissions models to engine cycle models. Selected combustion and emissions models are further modified to improve their prediction accuracy in the full operating zone. Responses of the combustion and emissions models have been validated for load and “start of injection” changes. Model predicted transient fuel consumption, air handling system parameters, and NOx and soot emissions are in good agreement with measured data on a turbocharged high power density common rail engine for the “nonroad transient cycle” (NRTC). It can be concluded that 0D models can be used for prediction of transient emissions on modern engines. How the formulated approach can also be extended to transient emissions prediction for other applications and fuels is also discussed.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77854000","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

Evaluation of a Semiempirical, Zero-Dimensional, Multizone Model to Predict Nitric Oxide Emissions in DI Diesel Engines’ Combustion Chamber 半经验的评估，零维，多区域模型预测一氧化氮排放在直喷式柴油发动机的燃烧室

IF 0.7

Journal of Combustion Pub Date : 2016-03-16 DOI: 10.1155/2016/6202438

N. Savva, D. Hountalas

{"title":"Evaluation of a Semiempirical, Zero-Dimensional, Multizone Model to Predict Nitric Oxide Emissions in DI Diesel Engines’ Combustion Chamber","authors":"N. Savva, D. Hountalas","doi":"10.1155/2016/6202438","DOIUrl":"https://doi.org/10.1155/2016/6202438","url":null,"abstract":"In the present study, a semiempirical, zero-dimensional multizone model, developed by the authors, is implemented on two automotive diesel engines, a heavy-duty truck engine and a light-duty passenger car engine with pilot fuel injection, for various operating conditions including variation of power/speed, EGR rate, fuel injection timing, fuel injection pressure, and boost pressure, to verify its capability for Nitric Oxide (NO) emission prediction. The model utilizes cylinder’s basic geometry and engine operating data and measured cylinder pressure to estimate the apparent combustion rate which is then discretized into burning zones according to the calculation step used. The requisite unburnt charge for the combustion in the zones is calculated using the zone equivalence ratio provided from a new empirical formula involving parameters derived from the processing of the measured cylinder pressure and typical engine operating parameters. For the calculation of NO formation, the extended Zeldovich mechanism is used. From this approach, the model is able to provide the evolution of NO formation inside each burned zone and, cumulatively, the cylinder’s NO formation history. As proven from the investigation conducted herein, the proposed model adequately predicts NO emissions and NO trends when the engine settings vary, with low computational cost. These encourage its use for engine control optimization regarding NOx abatement and real-time/model-based NOx control applications.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75730709","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: 2

Formation of Liquid Products at the Filtration Combustion of Solid Fuels 固体燃料过滤燃烧时液体产物的形成

IF 0.7

Journal of Combustion Pub Date : 2016-03-14 DOI: 10.1155/2016/9637082

E. Salgansky, V. M. Kislov, S. V. Glazov, M. Salganskaya

引用次数: 22

On Laminar Rich Premixed Polydisperse Spray Flame Propagation with Heat Loss 考虑热损失的富层流预混多分散喷雾火焰传播研究

IF 0.7

Journal of Combustion Pub Date : 2016-03-02 DOI: 10.1155/2016/1069873

G. Kats, J. Greenberg

引用次数: 2

Comparative Numerical Study of Four Biodiesel Surrogates for Application on Diesel 0D Phenomenological Modeling 四种生物柴油替代品在柴油0D现象学建模中的应用比较数值研究

IF 0.7

Journal of Combustion Pub Date : 2016-02-29 DOI: 10.1155/2016/3714913

Claude Valéry Ngayihi Abbe, R. Danwe, R. Nzengwa

{"title":"Comparative Numerical Study of Four Biodiesel Surrogates for Application on Diesel 0D Phenomenological Modeling","authors":"Claude Valéry Ngayihi Abbe, R. Danwe, R. Nzengwa","doi":"10.1155/2016/3714913","DOIUrl":"https://doi.org/10.1155/2016/3714913","url":null,"abstract":"To meet more stringent norms and standards concerning engine performances and emissions, engine manufacturers need to develop new technologies enhancing the nonpolluting properties of the fuels. In that sense, the testing and development of alternative fuels such as biodiesel are of great importance. Fuel testing is nowadays a matter of experimental and numerical work. Researches on diesel engine’s fuel involve the use of surrogates, for which the combustion mechanisms are well known and relatively similar to the investigated fuel. Biodiesel, due to its complex molecular configuration, is still the subject of numerous investigations in that area. This study presents the comparison of four biodiesel surrogates, methyl-butanoate, ethyl-butyrate, methyl-decanoate, and methyl-9-decenoate, in a 0D phenomenological combustion model. They were investigated for in-cylinder pressure, thermal efficiency, and emissions. Experiments were performed on a six-cylinder turbocharged DI diesel engine fuelled by methyl ester (MEB) and ethyl ester (EEB) biodiesel from wasted frying oil. Results showed that, among the four surrogates, methyl butanoate presented better results for all the studied parameters. In-cylinder pressure and thermal efficiency were predicted with good accuracy by the four surrogates. emissions were well predicted for methyl butanoate but for the other three gave approximation errors over 50%.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78644266","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: 4

Real Costs Assessment of Solar-Hydrogen and Some Fossil Fuels by means of a Combustion Analysis 基于燃烧分析的太阳能-氢和一些化石燃料的实际成本评估

IF 0.7

Journal of Combustion Pub Date : 2016-02-03 DOI: 10.1155/2016/6527510

G. Nicoletti, R. Bruno, N. Arcuri, Gerardo Nicoletti

{"title":"Real Costs Assessment of Solar-Hydrogen and Some Fossil Fuels by means of a Combustion Analysis","authors":"G. Nicoletti, R. Bruno, N. Arcuri, Gerardo Nicoletti","doi":"10.1155/2016/6527510","DOIUrl":"https://doi.org/10.1155/2016/6527510","url":null,"abstract":"In order to compare solar-hydrogen and the most used fossil fuels, the evaluation of the “external” costs related to their use is required. These costs involve the environmental damage produced by the combustion reactions, the health problems caused by air pollution, the damage to land from fuel mining, and the environmental degradation linked to the global warming, the acid rains, and the water pollution. For each fuel, the global cost is determined as sum of the market price and of the correspondent external costs. In order to obtain a quantitative comparison, the quality of the different combustion reactions and the efficiency of the technologies employed in the specific application sector have to be considered adequately. At this purpose, an entropic index that considers the degree of irreversibility produced during the combustion process and the degradation of surroundings is introduced. Additionally, an environmental index that measures the pollutants released during the combustions is proposed. The combination of these indexes and the efficiency of the several technologies employed in four energy sectors have allowed the evaluation of the total costs, highlighting an economic scenario from which the real advantages concerning the exploitation of different energy carrier are determined.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2016-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78632216","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

Review of Sensing Methodologies for Estimation of Combustion Metrics 燃烧度量估计的传感方法综述

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Journal of Combustion Pub Date : 2016-01-28 DOI: 10.1155/2016/8593523

Libin Jia, J. Naber, J. Blough

引用次数: 12