Combustion and Flame最新文献

{"title":"Elucidating reaction pathways and kinetic modeling in ozone-assisted low-temperature oxidation of n-pentanol","authors":"Ashenafi Emiru Teka ,&nbsp;Bingzhi Liu ,&nbsp;Yushen Yu,&nbsp;Shuyao Chen,&nbsp;Qiang Xu,&nbsp;Jiwen Guan,&nbsp;Zhandong Wang","doi":"10.1016/j.combustflame.2025.114098","DOIUrl":"10.1016/j.combustflame.2025.114098","url":null,"abstract":"<div><div><em>n</em>-Pentanol (C₅H₁₁OH) is a versatile biofuel and fuel additive used to enhance combustion efficiency and reduce emissions when blended with gasoline. Ongoing research in alternative fuels explores the potential applications of <em>n</em>-pentanol. Understanding the low-temperature oxidation of <em>n</em>-pentanol is essential for developing combustion kinetic models to optimize engine performance and minimize pollutants when using this biofuel. Herein, we investigated the low-temperature oxidation of <em>n</em>-pentanol with ozone (O₃) in an atmospheric jet-stirred reactor. Ozone addition enhanced reactivity, leading to the formation of various products. High-mass-resolution mass spectra and photoionization curves identified reaction intermediates and products, particularly C₅ hydroxy keto-hydroperoxide was identified for the first time. Quantification of the measured intermediates and products allowed for updating the kinetic model of <em>n</em>-pentanol oxidation, improving predictions and validating ignition delay times. However, discrepancies existed for elusive intermediates like C₅H₈O₂ and C₅H₁₂O₂, prompting further exploration of their formation pathways. The findings provide insights into the chain-branching reaction pathways of <em>n</em>-pentanol at low temperatures and contribute to refining kinetic models for alcohol oxidation.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114098"},"PeriodicalIF":5.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Thickened flame model extension for the simulation of lean hydrogen-air explosions in confined environments","authors":"Jean-Jacques Hok,&nbsp;Omar Dounia,&nbsp;Olivier Vermorel","doi":"10.1016/j.combustflame.2025.114070","DOIUrl":"10.1016/j.combustflame.2025.114070","url":null,"abstract":"<div><div>This paper investigates the coupling between wall confinement and flame front instabilities during lean H₂-air deflagrations in tubes. Flame-Resolved Simulations (FRS) show that confinement significantly affects flame behavior: (1) in narrow tubes, confinement effects dominate over flame instabilities and flame acceleration is driven dominantly by the finger flame mechanism, (2) while in wider tubes, instabilities have more space to develop, thereby enhancing their contribution to flame acceleration. In a large-scale modeling perspective, the paper delves into ways to reproduce the complex interaction between confinement and flame front instabilities using coarser meshes. Strong limitations of the Thickened Flame (TF) model, a classical approach for the Large Eddy Simulations (LES) for reactive flows, are first highlighted. The inherent inability of the TF approach to reproduce the specificities of lean H₂-air combustion is solved by employing the Thermo-Diffusive-Stretched-Thickened Flame (TD-S-TF) model initially developed in Hok et al. (2024) and extending it to account for confinement effects: the model incorporates a time-dependent efficiency function mimicking the effects of subgrid thermo-diffusive instabilities on flame acceleration, and saturated to account for the limited instability growth in confined spaces. Although such saturation is only demonstrated for the simple tube configuration, this strategy solves issues encountered with the TF model, thereby paving the way for accurate confined H₂-air explosions simulations.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114070"},"PeriodicalIF":5.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects and mechanisms of steam-diluent on the H2-O2 coaxial diffusion flames characteristics","authors":"Jinqi Zhu ,&nbsp;Linyao Zhang ,&nbsp;Penghua Qiu ,&nbsp;Yijun Zhao ,&nbsp;Xiaopeng Jiang ,&nbsp;Yu Zhang ,&nbsp;Jiazhi Wang","doi":"10.1016/j.combustflame.2025.114099","DOIUrl":"10.1016/j.combustflame.2025.114099","url":null,"abstract":"<div><div>The wet hydrogen-oxygen combustion technology with steam dilution is considered one of the most promising hydrogen utilization in the future. Steam dilution significantly influences the flame's physical yield by affecting diffusion. This study's diffusion mechanisms of steam dilution hydrogen-oxygen coaxial diffusion flame are experimentally and numerically investigated on the macroscopic and microscopic scale. The results indicate that steam dilution has a suppressive effect on combustion. At the macroscopic scale, there is a reduction in flame brightness, height, and width across a wideband wavelength spectrum as the content of steam increases. Steam dilution reduces the concentration and the space distribution of OH* in the main reaction zone. Moreover, there appears to be a threshold value for steam content at approximately 30 %∼40 %. Significant changes are observed in flame characteristics at high steam content and contrast at low steam content. The increased jet momentum flux ratio and the weakening of the heat release effect are critical factors for steam diluent to effectively reduce flame stoichiometric mixing lengths. At the microscopic scale, the H₂ effective diffusion coefficient is analyzed to achieve a molecular-level analysis of the mechanism of steam dilution. The impact of turbulence on the H₂ effective diffusion coefficient gradually intensifies as the jet distance increases. The steam addition concurrently alters the multi-physical characteristics, including velocity field, temperature field, and kinematic viscosity. The synergistic effects of these characteristics slightly modify the H₂ effective diffusion coefficient's peak while delaying its appearance in the physical field. This study provides theoretical foundations and data support for advancing wet hydrogen-oxygen combustion technology.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114099"},"PeriodicalIF":5.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of structure and interactions between chemical reactions, species transport and heat release in laminar flames","authors":"Liang Ji,&nbsp;Kalyanasundaram Seshadri","doi":"10.1016/j.combustflame.2025.114030","DOIUrl":"10.1016/j.combustflame.2025.114030","url":null,"abstract":"<div><div>A novel method for analyzing counterflow diffusion flames, called Integrated Reaction-Species-Heat Analysis (IRISA), is presented. It comprises three components: Analysis of Heat-release-rate Change (AHC), Analysis of Species Concentration Change (ASCC) and Analysis of Reaction Rate Change (ARRC). The AHC is designed to identify critical species influencing the heat release rate in combustion. Integration of ASCC with ARRC for key species and related reactions, respectively, enables the elucidation of complex interactions among species across regions with various temperatures. To illustrate this approach, this study investigates the mechanisms of auto-ignition of n-heptane and ethanol mixtures in a counterflow configuration under low strain rates. In mixtures where n-heptane is dominant, the inhibition of low-temperature chemistry by addition of ethanol impacts the heat release rate in regions where the temperature is higher through the diffusion of specific species such as CH₂O, C₂H₄, C₃H₆, and H₂O₂. In mixtures where ethanol is dominant, the high ethanol fractions in the mixture increase the heat release rate, primarily due to ethanol decomposition and its subsequent reactions. This method effectively quantifies and compares the influence of both chemical kinetics and species diffusion effects, providing detailed insights into the interactions among species across the reactive field when analyzing the counterflow configuration of complex fuel mixtures.</div><div><strong>Novelty and Significance Statement</strong> The novelty of this research lies in the development of a new method for analyzing counterflow flames that was inspired by Zurada’s sensitivity approach for neural network. By applying this method to computational results, we have provided a detailed explanation of a fundamental problem in mixed fuel auto-ignition. Unlike traditional sensitivity analyses in combustion research, which focus on the systematic impact of parameters on output results and treats the system as a black-box, our method provides details of what is taking place in this black-box. It elucidates the interactions among related species and the potential influence of species transport across different temperature zones in the reactive field. It is significant because the quantified proof provided by this method firmly demonstrates how species transport impacts the heat release rate and auto-ignition, and moves beyond qualitative analysis. Additionally, this method has the potential to be widely used for studying other diffusion-related problems in counterflow flames and can be adapted to investigate other one-dimensional steady-state flame configurations.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114030"},"PeriodicalIF":5.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive study on dynamics of flames in a nanosecond pulsed discharge. Part I: Discharge formation and gas heating","authors":"Yupan Bao ,&nbsp;Kailun Zhang ,&nbsp;Jinguo Sun ,&nbsp;Tomas Hurtig ,&nbsp;Alexander A. Konnov ,&nbsp;Mattias Richter ,&nbsp;Elias Kristensson ,&nbsp;Andreas Ehn","doi":"10.1016/j.combustflame.2025.114075","DOIUrl":"10.1016/j.combustflame.2025.114075","url":null,"abstract":"<div><div>Nanosecond pulsed discharges (NPD) have been extensively used in plasma-assisted combustion to stimulate combustion kinetics. Experimental measurement of the energy transfer processes in non-equilibrium plasma-assisted processes is extremely difficult, as the non-equilibrium plasma discharge involves numerous different species with transient and complex three-dimensional structures across various time scales. This paper is Part I of a systematic study of the dynamics of flat flames in a pin-to-pin NPD (4 ns FWHM, 30–50 kV, 1–5 Hz) at atmospheric pressure. For a comprehensive study of one single discharge, the plasma source is running at low frequencies to avoid pulse-to-pulse interactions. The plasma/flame interactions are accessed using laser-based diagnostics, combined with current/voltage measurements, optical emission spectroscopy, and high-speed videography. Particularly, Rayleigh scattering with Structured Laser Illumination Planar Imaging (SLIPI-RS) is applied with a spatial lock-in algorithm to minimize the interference from plasma emission and stray light problem. The current paper (Part I) details SLIPI-RS measurements and focuses on the discharge dynamics and gas temperature in a lean CH₄/air flame within the first 500 μs after the discharge stimulation. For a methane/air flame, a luminous and hot discharge channel was observed between the two electrodes with a shockwave on its edge. The plasma emission is dominated by the second positive band of nitrogen emission (C-B) and dies out within tens of nanoseconds, while the hot channel expands outwards to its maximum at 5 μs, when the shockwave is also observed to detach from the hot channel. Two-dimensional gas temperature map of the flame is calculated using SLIPI-RS until 500 μs after the discharge stimulation when discharge-induced turbulence starts dominating, while gas heating by shockwave is also analyzed using classical Rankine-Hugoniot relation. Temperatures acquired by both methods indicate that much more energy is deposited in the unburnt region of the flame. The dynamics from microseconds to milliseconds, with an emphasis on plasma effects on combustion and ignition enhancement, will be presented in Part II, for both CH₄/air flames and NH₃/air flames.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114075"},"PeriodicalIF":5.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An experimental and modeling study on combustion characteristics of dimethyl ether/ nitrous oxide/ chlorine","authors":"Ruining He ,&nbsp;Xuan Ren ,&nbsp;Xin Bai ,&nbsp;Yiheng Tong ,&nbsp;Wei Lin ,&nbsp;Ziwen Zhao ,&nbsp;Frederick Nii Ofei Bruce ,&nbsp;Fang Wang ,&nbsp;Jinhu Liang ,&nbsp;Yang Li","doi":"10.1016/j.combustflame.2025.114071","DOIUrl":"10.1016/j.combustflame.2025.114071","url":null,"abstract":"&lt;div&gt;&lt;div&gt;PEG and AP are widely used in strategic and tactical missile engines as key components of composite propellants. It remains a challenge to investigate the detailed combustion mechanism of PEG/AP due to the complex structure and complicated chemical reactions. DME, N&lt;sub&gt;2&lt;/sub&gt;O and Cl&lt;sub&gt;2&lt;/sub&gt; are the main intermediates of PEG and AP pyrolysis, respectively, which play a crucial role in PEG/AP combustion. DME/N&lt;sub&gt;2&lt;/sub&gt;O is also a promising combination propellant because of its high energy content and good combustion and environmental properties. This study systematically investigates the combustion characteristics of DME, N&lt;sub&gt;2&lt;/sub&gt;O and Cl&lt;sub&gt;2&lt;/sub&gt; mixtures based on experimental measurements. The Ignition Delay Times (IDT) of DME/N&lt;sub&gt;2&lt;/sub&gt;O mixtures at equivalence ratios of 0.5, 1.0, and 2.0 (N&lt;sub&gt;2&lt;/sub&gt;O as the oxidant) were measured using a high-pressure shock tube at pressures of 10.0 and 20.0 bar and in the temperature range of 1250–1600 K. Besides, half of the N&lt;sub&gt;2&lt;/sub&gt;O was replaced by Cl&lt;sub&gt;2&lt;/sub&gt; to investigate its impact on the ignition characteristics of DME/N&lt;sub&gt;2&lt;/sub&gt;O. The result shows that although the addition of Cl&lt;sub&gt;2&lt;/sub&gt; reduces the activity of the fuel mixture system, the ignition activation energy required for ignition has not changed. The laminar flame speeds of DME/N&lt;sub&gt;2&lt;/sub&gt;O mixtures were measured by a constant-volume reactor. The equivalence ratios ranged from 0.8 to 1.4, with N&lt;sub&gt;2&lt;/sub&gt; content controlled at 60 %, pressure at 1.0 bar, and initial temperature at 298/333 K. The experimental results were simulated using the NUIGMech1.3 model and a constructed model adding Cl&lt;sub&gt;2&lt;/sub&gt; related reactions to NUIGMech1.3 in this study. Sensitive and flux analyses were conducted to determine the crucial reactions for the IDT of DME/N&lt;sub&gt;2&lt;/sub&gt;O and DME/N&lt;sub&gt;2&lt;/sub&gt;O/Cl&lt;sub&gt;2&lt;/sub&gt;. The results indicate that the decomposition of DME generates ĊH&lt;sub&gt;3&lt;/sub&gt; and ĊH&lt;sub&gt;3&lt;/sub&gt;O, which is the most reactivity promoting reaction at all temperatures, and it doesn't be influenced by Cl&lt;sub&gt;2&lt;/sub&gt; presence. Meanwhile H-atom abstraction from DME by Ḣ is the most reactivity inhibiting reaction, while it shows promoting effect with the Cl&lt;sub&gt;2&lt;/sub&gt; addition, and the H-atom abstraction reaction by O&lt;sub&gt;2&lt;/sub&gt;, which did not show significant sensitivity before the addition of Cl&lt;sub&gt;2&lt;/sub&gt;, shows the strongest inhibitory effect at this time. H-atom abstraction reactions and C–O bond dissociation are two major pathways of DME primary consumption. Although the presence of Cl&lt;sub&gt;2&lt;/sub&gt; did not alter this macroscopic phenomenon, it had a significant impact on the flux of each pathway. Meanwhile, the addition of Cl&lt;sub&gt;2&lt;/sub&gt; directly changed the reaction after the third stage in the DME reaction pathways, making the reaction involving Cl&lt;sub&gt;2&lt;/sub&gt; dominant at this time. The results in the current study should be a positive contribution to the development and optimization of detaile","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114071"},"PeriodicalIF":5.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive study on dynamics of flames in a nanosecond pulsed discharge. Part II: Plasma-assisted ammonia and methane combustion","authors":"Jinguo Sun,&nbsp;Yupan Bao,&nbsp;Kailun Zhang,&nbsp;Alexander A. Konnov,&nbsp;Mattias Richter,&nbsp;Elias Kristensson,&nbsp;Andreas Ehn","doi":"10.1016/j.combustflame.2025.114076","DOIUrl":"10.1016/j.combustflame.2025.114076","url":null,"abstract":"<div><div>Understanding the flame dynamics in a nanosecond pulsed discharge (NPD) is imperative for the novel technology of plasma-assisted combustion. We conducted a systematic study on the dynamics of atmospheric NPD-assisted flames in single-pulse mode using Rayleigh scattering combined with structured illumination. The study is divided into two parts. Part I detailed the measurements and CH₄/air flame response within the first 500 μs after NPD initiation. In Part II, we extend the study from CH₄ to NH₃, focusing on the dynamics of both CH₄/air and NH₃/air flames across different timescales from nanoseconds to milliseconds. Results show that: (1) within the first 50 ns, the discharge is concentrated in the NH₃/air flame but more diffused and large-volume in the CH₄/air flame; (2) during 1–100 μs, for both flames, a shockwave is formed in the unburnt zone. Meanwhile, a heated gas channel causes a temperature rise in the burnt zone, and particularly, generates a flame kernel in the unburnt zone; (3) when <em>t</em> &gt; 100 μs, plasma-induced turbulence and intense flame movement are observed. Furthermore, the essential differences between NH₃ and CH₄/air flames are revealed in both unburnt and burnt zones. In the unburnt zone, the plasma-induced flame kernel in CH₄/air flames lasts until even 20 ms, whilst for NH₃/air flames, the kernel extinguishes within 500 μs, suggesting a much weaker performance of NPD pulse on NH₃ ignition. In the burnt zone, the temperature rise of the NH₃/air flame is much smaller than that of the CH₄/air flame, indicating a weaker combustion enhancement. These discrepancies cannot be attributed solely to discharge or fuel properties but rather to the plasma-flame coupling. Combining with the discharge morphologies, it is further revealed that the plasma-flame coupling is weaker in NH₃/air flames compared to CH₄/air flames, pronouncing the role of CH radicals in the chemi-ionization process of CH₄/air mixtures. These findings open a promising avenue for advancing plasma-assisted combustion of NH₃ and CH₄.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114076"},"PeriodicalIF":5.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and modeling study of 1,2,4-trimethylbenzene pyrolysis at atmospheric pressure in a jet-stirred reactor","authors":"Xiang Gao ,&nbsp;Du Wang ,&nbsp;Qian-Peng Wang ,&nbsp;Cheng-Yin Ye ,&nbsp;Ling-Nan Wu ,&nbsp;Xu-Peng Yu ,&nbsp;Ya-Ning Zhang ,&nbsp;Qing-Bo Zhu ,&nbsp;Zhan-Dong Wang ,&nbsp;Zhen-Yu Tian","doi":"10.1016/j.combustflame.2025.114080","DOIUrl":"10.1016/j.combustflame.2025.114080","url":null,"abstract":"<div><div>The experimental and kinetic modeling results regarding the 1,2,4-trimethylbenzene (T124MBZ) pyrolysis in a jet-stirred reactor coupled with a synchrotron vacuum ultraviolet molecular beam mass spectrometer at the pressure of 1.0 atm and temperatures of 990–1170 K are reported. Seven monocyclic aromatic hydrocarbons, twelve polycyclic aromatic hydrocarbons (PAHs), and five light hydrocarbons were detected and quantified. A comprehensive kinetic model comprising 997 species and 6148 reactions was developed and extensively validated against the experimental data of pyrolysis, high-pressure oxidation, ignition delay times, and laminar burning velocities. The model demonstrates a reasonable ability to replicate these experimental results. ROP analysis indicates that the dominant consumption pathways for T124MBZ involve H-abstraction at methyl sites by H radicals. These H radicals are predominantly generated via H elimination from the methyl groups of <em>o-</em>dimethylbenzyl, yielding methylxylylene, highlighting the significance of isomerization reactions of dimethylbenzyl in T124MBZ pyrolysis. The most significant reactions promoting T124MBZ consumption are H-abstraction at the <em>o</em>-/<em>m</em>-/<em>p</em>-methyl sites of T124MBZ by H radicals and unimolecular decomposition at the C-H bonds of methyl sites of T124MBZ. Unimolecular decomposition of 1,2,3-trimethylbenzene producing 2,3-dimethylbenzyl is the most inhibiting reaction. Indene, indane, naphthalene, phenanthrene, methylphenanthrene, dimethylphenanthrene and pyrene are identified as the major PAHs produced, with <em>o</em>-/<em>m</em>-/<em>p</em>-methylstyrene, particularly <em>o</em>-methylstyrene, serving as key intermediates in PAHs formation.</div></div><div><h3>Novelty and significance statement</h3><div>The novelty of this research lies in its new experimental investigation of T124MBZ pyrolysis. Several intermediates and products formed during T124MBZ pyrolysis were detected and quantified using a synchrotron vacuum ultraviolet molecular beam mass spectrometer. Furthermore, a comprehensive kinetic model for T124MBZ was developed. The agreement observed between the experimental data and the model emphasizes the importance of dimethylbenzyl isomerization reactions in the pyrolysis of T124MBZ. This is significant as it demonstrates that the position of substituents plays a key role in the pyrolysis of aromatic compounds. The findings deepen our understanding of the pyrolysis of polysubstituted benzene derivatives, particularly for T124MBZ, providing valuable insights into the important reaction pathways involved in the pyrolysis of jet fuels, and thus designing more effective regenerative cooling and combustion systems.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114080"},"PeriodicalIF":5.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143529657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Publication / Copyright Information","authors":"","doi":"10.1016/S0010-2180(25)00122-1","DOIUrl":"10.1016/S0010-2180(25)00122-1","url":null,"abstract":"","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"274 ","pages":"Article 114084"},"PeriodicalIF":5.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of cyclopentyl ring-opening β-scission reaction","authors":"Dapeng Liu,&nbsp;Aamir Farooq","doi":"10.1016/j.combustflame.2025.114073","DOIUrl":"10.1016/j.combustflame.2025.114073","url":null,"abstract":"<div><div>The β-scission reaction of the cyclopentyl radical plays a crucial role in cyclopentane oxidation and aromatic formation. However, conflicting reports exist in the literature regarding the primary pathway of this reaction. To reconcile this discrepancy, we conducted time-resolved measurements of allyl radicals generated from the β-scission of cyclopentyl radicals. Experiments were carried out in a shock tube, spanning temperatures of 858 – 1159 K and pressures near 1.4 bar. By analyzing the allyl time-histories, we determined the rate coefficients of the ring-opening C<img>C β-scission of cyclopentyl radical and evaluated the predictive capabilities of literature kinetic models. Our findings unequivocally establish the dominance of the C<img>C cleavage pathway, surpassing the C<img>H β-scission pathway and contributing ∼67 % to the overall reactivity. The literature models use rate values that vary by two orders of magnitude and fail to reproduce our experimental results. Implementation of our determined rate coefficients in the existing literature models gave improved prediction accuracy for intermediate species profiles.</div></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":"275 ","pages":"Article 114073"},"PeriodicalIF":5.8,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143519417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}