Journal of Combustion最新文献

Design, Modeling, and Feasibility Analysis of Rotary Valve for Internal Combustion Engine 内燃机旋转阀的设计、建模和可行性分析

IF 0.7

Journal of Combustion Pub Date : 2024-01-18 DOI: 10.1155/2024/8049436

Wenbo Dong, Vishwas N. Bedekar

{"title":"Design, Modeling, and Feasibility Analysis of Rotary Valve for Internal Combustion Engine","authors":"Wenbo Dong, Vishwas N. Bedekar","doi":"10.1155/2024/8049436","DOIUrl":"https://doi.org/10.1155/2024/8049436","url":null,"abstract":"There have been several studies focused on improving the efficiency of internal combustion engines using various techniques such as better design, better materials, and regenerative technologies. Recently, in 2016, Toyota reported 40% gas engine efficiency with their Prius model; however, there remains a lot more room for improvement towards the theoretical maximum value of 73% using the Carnot theorem. In this research, we present a freshly designed valvetrain that has the potential to improve the efficiency of a known conventional valve designed engine. The goal of this research was to prove the feasibility and significance of the new valve design. This research developed a simulation model of the new valve design and produced its physical property data. The data of the new design were compared to the conventional poppet valve design with respect to several parameters to discuss its working principle and advantages over the conventional valve mechanism. Modeling was performed using Python programming to predict the valve-opening mechanism. The design of experiments was setup to control and tune different parameters accordingly within the reasonable range of engine speed, viz., 1000–6000 rpm to simulate various working conditions. The maximum opening area for the rotary valve is calculated to be 0.795 sq.in which is smaller than the poppet valve’s area of 1.315 sq.in. However, under an example of 2900 rpm, the rotary valve was able to remain fully opened with constant efficiency of about 54% from 40 to 160 degrees of the crankshaft angle. While the poppet valve can achieve 88% efficiency at 90 degrees of the crankshaft angle and the efficiency significantly drops on either side of the maxima, the authors believe that this research would help explore improvements in the performance of a combustion cycle due to the novel rotary valve design that is investigated in this paper.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139615904","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

Comparative Analysis of Swirl Burner and Cross Jet Burner in Terms of Efficiency and Environmental Performance 旋流燃烧器与交叉喷射燃烧器效率与环保性能的对比分析

IF 0.7

Journal of Combustion Pub Date : 2023-08-18 DOI: 10.1155/2023/1692296

M. Zhumagulov, M. V. Dolgov, A. Baubek, Alexander M. Gribkov

{"title":"Comparative Analysis of Swirl Burner and Cross Jet Burner in Terms of Efficiency and Environmental Performance","authors":"M. Zhumagulov, M. V. Dolgov, A. Baubek, Alexander M. Gribkov","doi":"10.1155/2023/1692296","DOIUrl":"https://doi.org/10.1155/2023/1692296","url":null,"abstract":"The article contains a comparative analysis of two types of burners used in different methods of fuel-air mixture preparation: (1) vortex mixing and (2) mixing with transverse jets. The analysis was carried out in order to determine which one of the two burning devices is more efficient and has better environmental performance. In device no. 1, conditions for the fuel-air mixture formation are created by vortex turbulence. The basic principle lying at the core of this design is a vortex flow inside, which provokes a more intense mixing of fuel and air. Moreover, preliminary physical and thermal treatment of the fuel-air mixture has a positive effect on its environmental performance. In contrast, in device no. 2 based on transverse jets’ active mixture formation is achieved through collision of air and fuel flows at an angle close to 90°. The research was based on an experiment carried out with the use of a laboratory firing stand. Flue gas samples were analyzed in order to compare the main harmful air emission indicators with TESTO 350-XL gas analyzer. A propane-butane mixture of 60% C3H8 (propane) and 40% C4H10 (butane) was used as the main fuel. Some indicators were determined after the experiment: measurement units conversion from “ppm” to “mg/m3,” excess air ratio α and equivalence ratio φ, flue gas concentrations recalculation taking oxygen into account, fuel calorific value, and heat release rate. The analysis results are as follows: (i) the swirl burner shows better performance in terms of nitrogen oxides (NOx) emissions; there is a 1.75-fold difference in total NOx emissions compared to the cross jet burner; (ii) the burner on transverse jets is 10 times more efficient than the swirl burner in terms of carbon monoxide (CO) emissions.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79944016","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

Uranium Dust Cloud Combustion: Burning Characteristics and Absorption Spectroscopy Measurements 铀尘云燃烧:燃烧特性和吸收光谱测量

IF 0.7

Journal of Combustion Pub Date : 2022-11-16 DOI: 10.1155/2022/3570238

Emily N. Weerakkody, B. A. Read, M. Clemenson, N. Glumac

引用次数: 1

An Overview of Energy Recovery from Local Slaughterhouse-Based Gallus gallus domesticus Greasy Residues and Latest Applications 以本地屠宰场为基础的家禽油脂残留物的能源回收及最新应用综述

IF 0.7

Journal of Combustion Pub Date : 2022-10-25 DOI: 10.1155/2022/3512194

Zacharie Merlin Ayissi, Alain Fokoua Fongain, Leonel Tsafack Dongmo, Hossain Nazia, R. Alloune, Innocent Ndoh Mbue, R. Mouangue

{"title":"An Overview of Energy Recovery from Local Slaughterhouse-Based Gallus gallus domesticus Greasy Residues and Latest Applications","authors":"Zacharie Merlin Ayissi, Alain Fokoua Fongain, Leonel Tsafack Dongmo, Hossain Nazia, R. Alloune, Innocent Ndoh Mbue, R. Mouangue","doi":"10.1155/2022/3512194","DOIUrl":"https://doi.org/10.1155/2022/3512194","url":null,"abstract":"Gallus domesticus is one of the world’s most consumed animals, with a significant presence in all parts of the planet. Chicken oil appears to be a credible raw material in the context of alternative energy research. This study focuses on a literature review to highlight the chicken’s energy potential and the application of energy recovery from local slaughterhouse-based Gallus gallus domesticus greasy residues and it is proposed to make biodiesel from the fatty residues of Gallus gallus domesticus. The transesterification reaction takes place at 60°C. Methanol is used in a 1 : 6 oil-to-alcohol mass ratio. Catalysis is carried out with 1% (m/m) potassium hydroxide (KOH). The accepted reaction time under light agitation is 120 minutes. The reaction yield is estimated to be 85.6%, and the biodiesel produced is characterized. The postcharacterization values are consistent with the EN14214 biodiesel standard. Gas chromatography coupled with mass spectrometry reveals the intrinsic composition of the acids derived from the developed biodiesel methyl esters. The latter reveals a predominance of oleic acids with a value of 29.47% and palmitic acids with a value of 29.21%. The viscosity of greasy residues appeared to be relatively high at 69.32 mm/s. The low calorific value is 38775.363 KJ/Kg and the cetane index is 50. It has been observed that, for 1000 g of fat waste, it is possible to extract by cooking 507.807 g of oil, or an extraction yield of 51%. Fatty chicken residues from tropical market areas can be used as a raw material for biofuel development.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74560320","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

Effectiveness of Charcoal Adsorbent in Flue Gas Filters for PCB Reduction in Smoke from Hospital Incinerators 木炭吸附剂对减少医院焚化炉烟气中PCB的效果研究

IF 0.7

Journal of Combustion Pub Date : 2022-09-30 DOI: 10.1155/2022/5253467

R. Adu, S. Gyasi, D. Essumang

{"title":"Effectiveness of Charcoal Adsorbent in Flue Gas Filters for PCB Reduction in Smoke from Hospital Incinerators","authors":"R. Adu, S. Gyasi, D. Essumang","doi":"10.1155/2022/5253467","DOIUrl":"https://doi.org/10.1155/2022/5253467","url":null,"abstract":"The release of gas-phase polychlorinated biphenyls (PCBs) as one of the persistent organic pollutants (POPs) is an unfortunate result of combustion, especially from medical waste incinerators. This tends to make incinerators unpopular. The idea of a cheaply available air pollution control device fitted to incinerator chimneys can justify the continued use of incinerators. A gas filter unit, consisting of 3 filter beds with activated charcoal as an adsorbent, was designed, constructed, and fitted onto an existing incinerator at a university hospital in Ghana. Flue gas from the incinerator was sampled before and after the filter beds, using cylindrically-shaped mini-polyurethane foam (mini-PUF) samplers, and the analytes in the samples were then Soxhlet-extracted, purified, and analyzed for certain PCBs using the gas chromatography-mass spectrometer (GC-MS) technique. Twelve of the 14 indicators PCBs analyzed in the smoke samples were present, and 11 of them saw mean reductions ranging from 3.67% to 54.9% by the charcoal filter beds. These were PCB 18, PCB 28, PCB 31, PCB 44, PCB 101, PCB 118, PCB 138, PCB149, PCB 153, PCB 170, and PCB180. The gaseous concentrations of PCBs before filtration ranged from 0.0000788 ng/m3 for PCB 180 to 0.00129 ng/m3 for PCB 153. After the filtration by the charcoal adsorbent, they ranged from 0.00003734 ng/m3 for PCB 170 to 0.00112016 ng/m3 for PCB 153. The highest mean reduction of 54.9% came from the homologue, PCB 180, whilst the homologue with a dioxin-like character (PCB 118) saw a 22.44% reduction. This suggests that dioxins and other dioxin-like compounds are most likely adsorbed by the charcoal adsorbent. This gas filter unit should further be investigated for its effectiveness at removing other dioxin-like PCBs, dioxins, and furanes and for testing the effectiveness of thermophilic bacterial strains that can further metabolize these POPs into less harmful products.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78917762","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

Effects of Gasoline and Hydrogen Blends on Exhaust Gas Emissions and Fuel Consumption from Gasoline Internal Combustion Engines 汽油和氢混合燃料对汽油内燃机废气排放和燃料消耗的影响

IF 0.7

Journal of Combustion Pub Date : 2022-09-14 DOI: 10.1155/2022/5526205

Merlin Zacharie Ayissi, I. Newen, R. Alloune, D. Bitondo

{"title":"Effects of Gasoline and Hydrogen Blends on Exhaust Gas Emissions and Fuel Consumption from Gasoline Internal Combustion Engines","authors":"Merlin Zacharie Ayissi, I. Newen, R. Alloune, D. Bitondo","doi":"10.1155/2022/5526205","DOIUrl":"https://doi.org/10.1155/2022/5526205","url":null,"abstract":"Gasoline engines remain a potential source of atmospheric pollution. Dual fuel combustion was under investigation to cope with exposure to pollutants. Investigations on emission parameters and engine performance for a single-cylinder four-stroke petrol engine are carried out using multicriteria decision-making method (MCDM). Bar charts are constructed for three emission parameters in function of engine temperature and fuel consumption for different blends. Fuels were supplied at different engine running speeds. Parameters recorded during the experimental study were the concentrations of carbon monoxide (CO), hydrogen sulfide (H2S), percentages of lower explosive limit (LEL), and combustion duration. The maximum concentration of CO was 339 ppm at 70°C and 4000 rpm. The maximum concentration of H2S (3 ppm), was recorded at 94°C and 4000 rpm. The maximum percentage of LEL recorded was 3% at the majority of temperature and 4000 rpm. Consumption of 25 Cl of (gasoline + HHO) was recorded during the maximum time (50 min). The experiment showed high emissions of CO that can provoke respiratory disorders and explosive gases, factors of explosion at high speeds (4000 rpm), and low temperature (70°C). H2S emissions are very low (0–3 ppm) independently of the engine speeds and temperature. Blending gasoline with HHO shows a reduction in fuel consumption.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82962482","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

The Transition and Spread of a Chaparral Crown Fire: Insights from Laboratory Scale Wind Tunnel Experiments 林冠火灾的过渡和蔓延:来自实验室规模风洞实验的见解

IF 0.7

Journal of Combustion Pub Date : 2022-07-20 DOI: 10.1155/2022/5630594

Jeanette Cobian-Iñiguez, Amirhessam Aminfar, Shusmita Saha, Kyle Awayan, D. Weise, M. Princevac

{"title":"The Transition and Spread of a Chaparral Crown Fire: Insights from Laboratory Scale Wind Tunnel Experiments","authors":"Jeanette Cobian-Iñiguez, Amirhessam Aminfar, Shusmita Saha, Kyle Awayan, D. Weise, M. Princevac","doi":"10.1155/2022/5630594","DOIUrl":"https://doi.org/10.1155/2022/5630594","url":null,"abstract":"Fire occurring in the chaparral behaves as a crown fire, a dual-layer fire that typically ignites in a dead surface fuel layer and transitions to an elevated live crown layer where it continues to spread. In chaparral fuels including chamise, a dominant species in southern California, flame transition to live crown fuels is associated with higher spread rates and greater fire intensity. Despite the relative importance of surface-to-crown transition and crown fire spread, most fire models represent chaparral fire as surface fire, therefore omitting key behavior processes driving this fire system. The purpose of this study was to characterize transition and spread behavior in chaparral fires modeled experimentally as crown fires. We examined heat release rate in the surface and crown fuel layers, time to transition, flame height, and rate of spread in wind-driven and nonwind-driven fires at two crown base heights. Our results showed that wind increased heat release rate, rate of spread, and flame height. A marked increase in heat release rate was observed in wind-driven fires, where adding wind produced an increase from 328 kW to 526 for a crown base height of 0.6 m and from 243 kW to 503 kW for a crown base height of 0.7 m. Further, crown base height served to decrease heat release rate and rate of spread for wind-driven and nonwind-driven fires.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78730936","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

Investigative Study on Convective Heat Transfer inside Compartment during Fire Situation 火灾情况下舱内对流换热的研究

IF 0.7

Journal of Combustion Pub Date : 2022-07-18 DOI: 10.1155/2022/6559812

Philippe Onguene Mvogo, Olivier Zatao Samedi, Patrice Changement, J. Zaida, W. Nzié, Henri Ekobena Fouda, R. Mouangue

{"title":"Investigative Study on Convective Heat Transfer inside Compartment during Fire Situation","authors":"Philippe Onguene Mvogo, Olivier Zatao Samedi, Patrice Changement, J. Zaida, W. Nzié, Henri Ekobena Fouda, R. Mouangue","doi":"10.1155/2022/6559812","DOIUrl":"https://doi.org/10.1155/2022/6559812","url":null,"abstract":"According to the geometry of compartments, quantities of smokes released during fire tend to accumulate at ceiling so as to form a cloud of hot gases. Heat transfer between these hot gases and walls is decisive for the development of fire. An increase in temperature of these gases could lead to dangerous phenomena such as flashovers and backdrafts. Owing to experiments and numerical simulation, the objective of the present paper is to investigate on the influence of natural ventilation on convective heat transfer between hot gases and walls of a room in fire. So, varying the ventilation level, it was firstly about to carry out fire tests in an experimental room. Secondly, study was focused on the numerical simulation of these tests so as to estimate velocity field of burnt gases near walls during fire. Validation of numerical results has been done by confronting simulated results to experimental results. A full-scale extrapolation of results enabled revealing that while the ventilation level in the room changes, the amplitude of convective heat transfer changes according to the regime of fire. It was shown that for the fuel-controlled fire, the convective heat transfer coefficient strongly increases with the ventilation factor, and for the ventilation-controlled fire, convective heat transfer coefficient weakly decreases with the ventilation factor and remains nevertheless close to value \u0000 \u0000 \u0000 8.75\u0000 W\u0000 ⋅\u0000 \u0000 \u0000 m\u0000 \u0000 \u0000 −\u0000 2\u0000 \u0000 \u0000 ⋅\u0000 \u0000 \u0000 K\u0000 \u0000 \u0000 −\u0000 1\u0000 \u0000 \u0000 \u0000 .","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75343213","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

The Characterization of Liquefied Petroleum Gas (LPG) Using a Modified Bunsen Burner 使用改良的本生灯对液化石油气(LPG)进行表征

IF 0.7

Journal of Combustion Pub Date : 2022-05-02 DOI: 10.1155/2022/6977930

Bader A. Alfarraj, A. Al-Harbi, Saud A. Binjuwair, Abdullah M. Alkhedhair

引用次数: 3

Dynamics of Thermoacoustic Oscillations in Swirl Stabilized Combustor without and with Porous Inert Media 有无多孔惰性介质时旋流稳定燃烧室热声振荡动力学

IF 0.7

Journal of Combustion Pub Date : 2022-02-21 DOI: 10.1155/2022/5440457

Cody Dowd, Joseph Meadows

{"title":"Dynamics of Thermoacoustic Oscillations in Swirl Stabilized Combustor without and with Porous Inert Media","authors":"Cody Dowd, Joseph Meadows","doi":"10.1155/2022/5440457","DOIUrl":"https://doi.org/10.1155/2022/5440457","url":null,"abstract":"Lean premixed (LPM) combustion processes are of increased interest to the gas turbine industry due to their reduction in harmful emissions. These processes are susceptible to thermoacoustic instabilities, which are produced when energy added by an in-phase relationship between unsteady heat release and acoustic pressure is greater than energy dissipated by loss mechanisms. To better study these instabilities, quantitative experimental resolution of heat release is necessary, but it presents a significant challenge. Most combustion systems are partially premixed and therefore will have spatially varying equivalence ratios, resulting in spatially variant heat release rates. For laminar premixed flames, optical diagnostics, such as OH chemiluminescence, are proportionally related to heat release. This is not true for turbulent and partially premixed flames, which are common in commercial combustors. Turbulent eddies effect the strain on flame sheets which alter light emission, such that there is no longer a proportional relationship. In this study, phased, averaged, and spatially varying heat release measurements are performed during a self-excited thermoacoustic instability without and with porous inert media (PIM). Previous studies have shown that PIM can passively mitigate thermoacoustic instabilities, and to the best of the authors’ knowledge, this is the first-time that heat release rates have been quantified for investigating the mechanisms responsible for mitigating instabilities using PIM. Heat release is determined from high-speed PIV and Abel inverted chemiluminescence emission. OH\u0000 \u0000 \u0000 \u0000 \u0000 ∗\u0000 \u0000 \u0000 \u0000 chemiluminescence is used with a correction factor, computed from a chemical kinetics solver, to calculate heat release. The results and discussion show that along with significant acoustic damping, PIM eliminates the direct path in which heat release regions can be influenced by incoming perturbations, through disruption of the higher energy containing flow structures and improved mixing.","PeriodicalId":44364,"journal":{"name":"Journal of Combustion","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2022-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73866350","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