Journal of Combustion最新文献_第6页

Effects of Injection Rate Profile on Combustion Process and Emissions in a Diesel Engine 喷油速率分布对柴油机燃烧过程和排放的影响

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Journal of Combustion Pub Date : 2017-06-21 DOI: 10.1155/2017/9702625

F. Bai, Zuowei Zhang, Yongchen Du, Fan Zhang, Zhijun Peng

{"title":"Effects of Injection Rate Profile on Combustion Process and Emissions in a Diesel Engine","authors":"F. Bai, Zuowei Zhang, Yongchen Du, Fan Zhang, Zhijun Peng","doi":"10.1155/2017/9702625","DOIUrl":"https://doi.org/10.1155/2017/9702625","url":null,"abstract":"When multi-injection is implemented in diesel engine via high pressure common rail injection system, changed interval between injection pulses can induce variation of injection rate profile for sequential injection pulse, though other control parameters are the same. Variations of injection rate shape which influence the air-fuel mixing and combustion process will be important for designing injection strategy. In this research, CFD numerical simulations using KIVA-3V were conducted for examining the effects of injection rate shape on diesel combustion and emissions. After the model was validated by experimental results, five different shapes (including rectangle, slope, triangle, trapezoid, and wedge) of injection rate profiles were investigated. Modeling results demonstrate that injection rate shape can have obvious influence on heat release process and heat release traces which cause different combustion process and emissions. It is observed that the baseline, rectangle (flat), shape of injection rate can have better balance between NOx and soot emissions than the other investigated shapes. As wedge shape brings about the lowest NOx emissions due to retarded heat release, it produces the highest soot emissions among the five shapes. Trapezoid shape has the lowest soot emissions, while its NOx is not the highest one. The highest NOx emissions were produced by triangle shape due to higher peak injection rate.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83731474","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: 8

Small Engines as Bottoming Cycle Steam Expanders for Internal Combustion Engines 作为内燃机底循环蒸汽膨胀器的小型发动机

IF 0.7

Journal of Combustion Pub Date : 2017-05-31 DOI: 10.1155/2017/1742138

Rohitha Weerasinghe, Sandra Hounsham

{"title":"Small Engines as Bottoming Cycle Steam Expanders for Internal Combustion Engines","authors":"Rohitha Weerasinghe, Sandra Hounsham","doi":"10.1155/2017/1742138","DOIUrl":"https://doi.org/10.1155/2017/1742138","url":null,"abstract":"Heat recovery bottoming cycles for internal combustion engines have opened new avenues for research into small steam expanders [1]. Dependable data for small steam expanders will allow us to predict on their suitability as bottoming cycle engines and the fuel economy achieved by using them as bottoming cycles. Wankel Engines, with its lower resistance properties at small scale provide excellent contenders for bottoming cycle expanders. Present paper is based on results of experiments carried out on small scale Wankel and two stroke reciprocating engines as air expanders and as steam expanders. A test facility developed at Sussex used for measurements comprised of a torque, power and speed measurements, electronic actuation of valves, synchronized data acquisition of pressure and temperatures of steam and inside the engines for steam and internal combustion cycles. Results are presented for four engine modes, viz. reciprocating engine in uniflow steam expansion mode and air expansion mode, and rotary Wankel engine in steam expansion mode and air expansion mode. The air tests will provide base data for friction and motoring effects whereas steam tests will tell how effective will the engines be in this mode. Results for power, torque, and p-V diagrams are compared to determine the change in performance from air expansion mode to steam expansion mode.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89943909","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

Decomposition Characteristics and Kinetics of Microalgae in N2 and CO2 Atmospheres by a Thermogravimetry 热重法研究微藻在N2和CO2环境中的分解特性及动力学

IF 0.7

Journal of Combustion Pub Date : 2017-03-15 DOI: 10.1155/2017/6160234

X. Qing, Mao Xiaoqian, Yu Zhao-sheng, Cai Zilin, Ling Chang-ming

引用次数: 4

Parametric Study to Improve Subpixel Accuracy of Nitric Oxide Tagging Velocimetry with Image Preprocessing 利用图像预处理提高一氧化氮标记测速亚像素精度的参数化研究

IF 0.7

Journal of Combustion Pub Date : 2017-02-20 DOI: 10.1155/2017/6159802

R. Vedula, Mayank K. Mittal, H. Schock

{"title":"Parametric Study to Improve Subpixel Accuracy of Nitric Oxide Tagging Velocimetry with Image Preprocessing","authors":"R. Vedula, Mayank K. Mittal, H. Schock","doi":"10.1155/2017/6159802","DOIUrl":"https://doi.org/10.1155/2017/6159802","url":null,"abstract":"Biacetyl phosphorescence has been the commonly used molecular tagging velocimetry (MTV) technique to investigate in-cylinder flow evolution and cycle-to-cycle variations in an optical engine. As the phosphorescence of biacetyl tracer deteriorates in the presence of oxygen, nitrogen was adopted as the working medium in the past. Recently, nitrous oxide MTV technique was employed to measure the velocity profile of an air jet. The authors here plan to investigate the potential application of this technique for engine flow studies. A possible experimental setup for this task indicated different permutations of image signal-to-noise ratio (SNR) and laser line width. In the current work, a numerical analysis is performed to study the effect of these two factors on displacement error in MTV image processing. Also, several image filtering techniques were evaluated and the performance of selected filters was analyzed in terms of enhancing the image quality and minimizing displacement errors. The flow displacement error without image preprocessing was observed to be inversely proportional to SNR and directly proportional to laser line width. The mean filter resulted in the smallest errors for line widths smaller than 9 pixels. The effect of filter size on subpixel accuracy showed that error levels increased as the filter size increased.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88663330","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

Influence of Advanced Injection Timing and Fuel Additive on Combustion, Performance, and Emission Characteristics of a DI Diesel Engine Running on Plastic Pyrolysis Oil 提前喷油正时及燃油添加剂对塑料热解油直喷柴油机燃烧、性能及排放特性的影响

IF 0.7

Journal of Combustion Pub Date : 2017-02-15 DOI: 10.1155/2017/3126342

Ioannis Kalargaris, G. Tian, S. Gu

{"title":"Influence of Advanced Injection Timing and Fuel Additive on Combustion, Performance, and Emission Characteristics of a DI Diesel Engine Running on Plastic Pyrolysis Oil","authors":"Ioannis Kalargaris, G. Tian, S. Gu","doi":"10.1155/2017/3126342","DOIUrl":"https://doi.org/10.1155/2017/3126342","url":null,"abstract":"This paper presents the investigation of engine optimisation when plastic pyrolysis oil (PPO) is used as the primary fuel of a direct injection diesel engine. Our previous investigation revealed that PPO is a promising fuel; however the results suggested that control parameters should be optimised in order to obtain a better engine performance. In the present work, the injection timing was advanced, and fuel additives were utilised to overcome the issues experienced in the previous work. In addition, spray characteristics of PPO were investigated in comparison with diesel to provide in-depth understanding of the engine behaviour. The experimental results on advanced injection timing (AIT) showed reduced brake thermal efficiency and increased carbon monoxide, unburned hydrocarbons, and nitrogen oxides emissions in comparison to standard injection timing. On the other hand, the addition of fuel additive resulted in higher engine efficiency and lower exhaust emissions. Finally, the spray tests revealed that the spray tip penetration for PPO is faster than diesel. The results suggested that AIT is not a preferable option while fuel additive is a promising solution for long-term use of PPO in diesel engines.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81297525","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: 20

Numerical Investigation of Critical Velocity in Reduced Scale Tunnel Fire with Constant Heat Release Rate 等放热速率下缩尺度隧道火灾临界速度的数值研究

IF 0.7

Journal of Combustion Pub Date : 2017-01-18 DOI: 10.1155/2017/7125237

R. Mouangue, Philippe M. Onguene, J. Zaida, Henri P. F. Ekobena

{"title":"Numerical Investigation of Critical Velocity in Reduced Scale Tunnel Fire with Constant Heat Release Rate","authors":"R. Mouangue, Philippe M. Onguene, J. Zaida, Henri P. F. Ekobena","doi":"10.1155/2017/7125237","DOIUrl":"https://doi.org/10.1155/2017/7125237","url":null,"abstract":"When a fire occurs in a tunnel in the absence of sufficient air supply, large quantities of smoke are generated, filling the vehicles and any space available around them. Hot gases and smoke produced by fire form layers flowing towards extremities of the tunnel which may interfere with person’s evacuation and firefighter’s intervention. This paper carries out a numerical simulation of an unexpected fire occurring in a one-way tunnel in order to investigate for the critical velocity of the ventilation airflow; this one is defined as the minimum velocity able to maintain the combustion products in the downstream side of tunnel. The computation is performed successively with two types of fuels representing a large and a small heat release rate, owing to an open source CFD code called ISIS, which is specific to fires in confined and nonconfined environments. It is indicated that, after several computations of full-scale fires of 43.103 and 19.103 kJ/kg as heat release rate, the velocities satisfying the criterion of healthy environment in the upstream side of the tunnel are 1.34 m/s and 1.12 m/s, respectively.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86720549","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: 6

Experimental Study of the Combustion of Kerosene and Binary Surrogate in the Model Combustion Chamber 煤油及二元替代物在模型燃烧室燃烧的实验研究

IF 0.7

Journal of Combustion Pub Date : 2017-01-09 DOI: 10.1155/2017/3963075

S. Matveev, I. V. Chechet, A. S. Semenikhin, V. Y. Abrashkin, S. V. Lukachev, S. Matveev

引用次数: 7

Study of the Radical Chain Mechanism of Hydrocarbon Oxidation for In Situ Combustion Process 原位燃烧过程中烃类氧化自由基链机理的研究

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Journal of Combustion Pub Date : 2017-01-01 DOI: 10.1155/2017/2526596

A. Ushakova, V. Zatsepin, M. Varfolomeev, D. Emelyanov

{"title":"Study of the Radical Chain Mechanism of Hydrocarbon Oxidation for In Situ Combustion Process","authors":"A. Ushakova, V. Zatsepin, M. Varfolomeev, D. Emelyanov","doi":"10.1155/2017/2526596","DOIUrl":"https://doi.org/10.1155/2017/2526596","url":null,"abstract":"Despite the abundance of in situ combustion models of oil oxidation, many of the effects are still beyond consideration. For example, until now, initial stages of oxidation were not considered from a position of radical chain process. This is a serious difficulty for the simulation of oil recovery process that involves air injection. To investigate the initial stages of oxidation, the paper considers the sequence of chemical reactions, including intermediate short-living compounds and radicals. We have attempted to correlate the main stages of the reaction with areas of heat release observed in the experiments. The system of differential equations based on the equations of oxidation reactions was solved. Time dependence of peroxides formation and start of heat release is analytically derived for the initial stages. We have considered the inhibition of initial oxidation stages by aromatic oil compounds and have studied the induction time in dependence on temperature. Chain ignition criteria for paraffins and crude oil in presence of core samples were obtained. The calculation results are compared with the stages of oxidation that arise by high-pressure differential scanning calorimetry. According to experimental observations we have determined which reactions are important for the process and which can be omitted or combined into one as insignificant.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87261562","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: 39

An Experimental Insight into the Smoldering-Flaming Transition Phenomenon 阴燃-燃烧过渡现象的实验研究

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Journal of Combustion Pub Date : 2017-01-01 DOI: 10.1155/2017/4062945

Poorva Shrivastava, Chakshu Baweja, Herambraj A. Nalawade, A. Kumar, V. Ramanan, V. Malhotra

引用次数: 5

The Role of Liquid Fuels Channel Configuration on the Combustion inside Cylindrical Mesoscale Combustor 液体燃料通道构型对圆柱形中尺度燃烧器燃烧的影响

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Journal of Combustion Pub Date : 2017-01-01 DOI: 10.1155/2017/3679679

A. F. H. Soegiharto, I. Wardana, L. Yuliati, M. Nursasongko

{"title":"The Role of Liquid Fuels Channel Configuration on the Combustion inside Cylindrical Mesoscale Combustor","authors":"A. F. H. Soegiharto, I. Wardana, L. Yuliati, M. Nursasongko","doi":"10.1155/2017/3679679","DOIUrl":"https://doi.org/10.1155/2017/3679679","url":null,"abstract":"This research intended to investigate combustion of liquid fuel in 3.5 mm inner diameter quartz glass tube mesocombustor, based on liquid film evaporation by using heat recirculation. The mesocombustor has a copper section for heating and evaporating the liquid fuel. In mesocombustor type A, the fuel was glided through the narrow canal in the copper wall while the air was glided through the axial of combustor. The flame could only be successfully stabilized in high-ratio equivalent ranging from to , due to the gap without combustion reaction caused by high air-fuel mixture over the limits of flame stability. Mesocombustor type B, which has annulus-shaped canal, could shift the flame stability from to ; however, it also narrowed the limits of flame stability due to the wall cooling. In mesocombustor type C, both liquid fuel and air were glided through the annulus-shaped canal in the copper wall to fix the fuel evaporation and air mixture. The flame of type C was successfully stabilized, from to wider than types A and B. The flame of type C mesocombustor is circle-shaped and fitted to cross section of mesocombustor, but it still has thin gap without any flames due to thermal quenching by the wall.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84633124","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: 9