Article
Chemistry, Physical
Berk Can Duva, Elisa Toulson
Summary: The fundamental combustion characteristics of H-2/air flames with the addition of actual H-2/air combustion residuals were examined experimentally and numerically. The results showed that the flame speed and adiabatic flame temperature decreased linearly with increasing diluent level, while the change in burned gas Markstein length was more complex.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Xinlu Han, Marco Lubrano Lavadera, Christian Brackmann, Zhihua Wang, Yong He, Alexander A. Konnov
Summary: The formation of nitric oxide (NO) in methane (CH4) flames has been extensively studied, but discrepancies between simulations using different kinetic mechanisms and experimental results persist. Experimental data was collected for NO formation in post-flame zones of CH4+O2+N2 flames with varying oxygen ratios. Analysis showed that thermal-NO production plays a key role in the increase of NO mole fraction in stoichiometric and fuel-lean flames as oxygen ratio increases.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Willyanto Anggono, Akihiro Hayakawa, Ekenechukwu C. Okafor, Gabriel Jeremy Gotama, Stevan Wongso
Summary: The study found that an increase in CO2 dilution ratio reduces the laminar burning velocity of CH4/CO2/Air mixtures and affects the flame response to stretch. Results showed a non-monotonic relationship between CO2 dilution ratio and different equivalence ratios, with an increase in CO2 enhancing the flames' response to stretch.
COMBUSTION SCIENCE AND TECHNOLOGY
(2021)
Article
Thermodynamics
Shehab Elhawary, Aminuddin Saat, Mazlan Abdul Wahid
Summary: This study investigates the effect of hydrogen (H2) and nitrous oxide (N2O) on the laminar burning velocity and flame instability of biogas. The results show that the laminar burning velocities are enhanced when biogas is mixed with hydrogen or nitrous oxide. However, the increase is more significant with nitrous oxide due to the energy released by its decomposition reaction. The flame thickness of the biogas-nitrous oxide mixture is lower than that of the biogas-hydrogen mixture, indicating higher flame instability. The Lewis number of the biogas-nitrous oxide mixture is also lower, suggesting a greater influence of diffusive-thermal instability on the flame. The reactions of H + O-2 and H + CH3(+M) have the most significant impact on the laminar burning velocities of biogas-hydrogen mixtures, while the reactions of N-2 O + H and N2O(+ M) are the most important for biogas-nitrous oxide combustion.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Yada Leo, Bo Zhang
Summary: The study investigates the explosion behavior and Rayleigh-Taylor instability of methane-air mixtures. Results show that increasing initial pressure leads to higher maximum explosion pressure, while flame speed and laminar burning velocity decrease. Ignition feasibility and delay time are strongly related to reactant mass per unit volume and fuel composition, and RT instability causes flame structural instability.
Article
Thermodynamics
Marie-Eve Clavel, Pierre Schleuniger, Yiqing Wang, Alexis Vandel, Vincent Modica, Zheng Chen, Bruno Renou
Summary: The study investigates the measurement of laminar burning velocity under various conditions using density weighted displacement speeds. The effects of pressure decrease and flame stretch on burned gas velocity are analyzed, and it is found that a correction factor is needed to accurately determine LBV at low pressures. Additionally, the kinetic schemes for methane and n-decane are validated at low pressures.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Energy & Fuels
Shu Zheng, Hao Liu, Dengke Li, Zirui Liu, Bo Zhou, Qiang Lu
Summary: With the development of high-load and high-pressure combustion equipment, it is crucial to enhance the accuracy of laminar burning velocity prediction under elevated pressures. In this study, a Statistical Narrow-Band (SNB) model of methane at elevated pressures was constructed using the HITRAN 2016 database, and the impact of radiation reabsorption on burning velocity was investigated.
Article
Thermodynamics
Yu Liu, Wu Gu, Jinduo Wang, Dawei Rao, Xiaoxiao Chen, Hongan Ma, Wen Zeng
Summary: Ethanol biofuel can be used as an alternative fuel in aero-engines to reduce CO2 emission and increase oil security. Experimental and theoretical analysis show that the addition of ethanol increases the laminar burning velocity of RP-3, with the chemical effect playing a decisive role. The combustion process of ethanol/RP-3 is influenced by the formation of CH3, CH2O, and HCO due to the participation of more active radicals.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Ya Li, Wu Xu, Yong Jiang, K. M. Liew
Summary: Recent investigation suggest that CO2, N2, and He have varying effects on the laminar burning velocity (LBV) and cellular instability of 2-MTHF-air flames. The most chaotic state occurred at approximately phi = 1.3 under all test conditions. CO2 and He showed similar abilities to delay the onset of cellular instability, while N2 showed a weaker ability to do so.
Article
Energy & Fuels
R. Le Dortz, C. Strozzi, J. Sotton, M. Bellenoue
Summary: In recent years, aircraft manufacturers and international environmental organizations have established strict objectives for reducing pollution and fuel consumption in turbo-engines. Innovative solutions like constant-volume combustion are being developed to meet these goals. Experimental measurements and numerical simulations with different surrogates for commercial kerosene are conducted to evaluate their ability to reproduce the laminar burning velocity properties of commercial kerosene.
Article
Energy & Fuels
Shuangming Wei, Minggao Yu, Bei Pei, Zhihui Ma, Shiliang Li, Yaxiang Kang
Summary: This work measured the laminar flame speeds of hydrogen/dimethyl-ether/methane/air mixtures under different hydrogen enrichment ratios and compared the results using four DME chemical reaction kinetic mechanisms. The experimental data showed good agreement with the calculated values using the Zhao mechanism, and the laminar flame speeds were significantly affected by hydrogen enrichment ratios, especially under fuel-rich conditions. The study also revealed that hydrogen enrichment had different effects on diffusional-thermal instability and hydrodynamic instability depending on the fuel conditions.
Article
Engineering, Environmental
Xi Wang, Ligang Zheng, Jian Wang, Rongkun Pan, Zhanwang Shi, Jianlei Zhang, Yuxin Miao
Summary: This study demonstrates the effect of propane co-firing on the explosion characteristics of oxygen-enriched biogas. The results show that increasing the oxygen fraction enhances the explosion strength and accelerates flame propagation. The propane effect is distinguishable during the dynamic evolution of the flame, and its magnitude is influenced by the oxygen enrichment.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Thermodynamics
Alexander Bee, Michael Boerner
Summary: This study investigates the effects of nitrogen dilution and pressure reduction on the laminar flame speed and flammability limits of methane/oxygen mixtures. The results show that the laminar flame speed increases with decreasing nitrogen content and decreasing pressure. The upper flammability limit is pressure-sensitive while the lower flammability limit remains stationary for different pressure levels.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Michael J. Hegetschweiler, John L. Pagliaro, Lukas Berger, Raik Hesse, Joachim Beeckmann, Chaimae Bariki, Heinz Pitsch, Gregory T. Linteris
Summary: The study investigated the burning velocities of mixtures of R-32 with air at different equivalence ratios, finding that the effects of stretch and radiation occur simultaneously. Different data reduction approaches had significant effects on the burning velocities inferred from experiments and simulations, and a new flame radius tracking method provided improved agreement with predicted gas velocity variations.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
M. B. Raida, G. J. Hoetmer, A. . A. . Konnov, J. A. van Oijen, L. P. H. de Goey
Summary: A new setup for burning velocity measurements using the Heat Flux method has been constructed, with improved burner design. The experimental results have high accuracy and good agreement with literature data.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Felix Leach, Richard Stone, Dave Richardson, Andrew Lewis, Sam Akehurst, James Turner, Sarah Remmert, Steven Campbell, Roger F. Cracknell
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
(2018)
Article
Energy & Fuels
Tawfik Badawy, Mohammadreza Anbari Attar, Peter Hutchins, Hongming Xu, Jens Krueger Venus, Roger Cracknell
Article
Energy & Fuels
N. Hinton, R. Stone, Roger Cracknell, Carsten Olm
Article
Energy & Fuels
Kieran P. Somers, Henry J. Curran, Ultan Burke, Colin Banyon, Hichem M. Hakka, Frederique Battin-Leclerc, Pierre-Alexandre Glaude, Shaun Wakefield, Roger F. Cracknell
Article
Energy & Fuels
Felix C. P. Leach, Richard Stone, David Richardson, James W. G. Turner, Andrew Lewis, Sam Akehurst, Sarah Remmert, Steven Campbell, Roger Cracknell
Article
Thermodynamics
Inna Gorbatenko, Alison S. Tomlin, Malcolm Lawes, Roger F. Cracknell
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Kieran P. Somers, Roger F. Cracknell, Henry J. Curran
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Energy & Fuels
Felix C. P. Leach, Richard Stone, David Richardson, Andrew G. J. Lewis, Sam Akehurst, James W. G. Turner, Varun Shankar, Jasprit Chahal, Roger F. Cracknell, Allen Aradi
Article
Energy & Fuels
Yanfei Li, Hongming Xu, Roger Cracknell, Robert Head, Shijin Shuai
Article
Energy & Fuels
Irene Ruiz-Rodriguez, Roger Cracknell, Michael Parkes, Thanos Megaritis, Lionel Ganippa
Article
Thermodynamics
Rui Xu, Chiara Saggese, Robert Lawson, Ashkan Movaghar, Thomas Parise, Jiankun Shao, Rishav Choudhary, Ji-Woong Park, Tianfeng Lu, Ronald K. Hanson, David F. Davidson, Fokion N. Egolfopoulos, Allen Aradi, Arjun Prakash, Vivek Raja Raj Mohan, Roger Cracknell, Hai Wang
COMBUSTION AND FLAME
(2020)
Article
Energy & Fuels
Jinlin Han, L. M. T. Somers, Roger Cracknell, Arndt Joedicke, Robert Wardle, Vivek Raja Raj Mohan
Article
Energy & Fuels
Tommy R. Powell, James P. Szybist, Flavio Dal Forno Chuahy, Scott J. Curran, John Mengwasser, Allen Aradi, Roger Cracknell
Summary: The octane index (OI) is a new autoignition metric developed to better describe fuel knock resistance over a broader range of engine conditions. Research found that under ACI operation, autoignition behavior is more closely correlated to fuel composition rather than RON and MON tests conditions.
Article
Energy & Fuels
Sandro Gail, Roger F. Cracknell, Benoit Poulet, Guy Lovett, Andrea Festa, Varun Shankar, Rene D. Buettgen, Karl Alexander Heufer
Summary: The study introduces a three-component surrogate formulation, THIP, based on toluene, n-heptane, and isopentane, which can effectively simulate the RON and MON of actual gasoline, while also better matching density, distillation properties, and other volatility parameters. THIP surrogates can fully cover EN228 Summer and Winter gasoline specifications and exhibit excellent matching between ignition delay time and temperature.
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.