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可控流场尺度预混湍流燃烧器及其火焰结构分析 CSCD PKU
期刊论文 | 2018 , (2) , 10-17 | 实验流体力学
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Abstract :

为了研究单一湍流场参数对预混湍流火焰结构的影响,以及拓宽湍流场的强度和尺度范围,发展了一套可变结构的预混湍流燃烧器.采用恒温型热线风速仪标定流场,得到了一系列湍流参数.流场标定结果表明:该燃烧器能显著拓宽湍流强度和尺度范围,并能利用不同几何结构产生多种可控流场,实现研究单一湍流参数对湍流燃烧速度和火焰结构影响的目的.选用有代表性的15种湍流孔板组合结构,利用OH-PLIF燃烧激光诊断技术,开展了湍流燃烧实验,结果表明:湍流强度的增大(1<u'/SL.0<10)使得湍流火焰分区扩展到了薄层反应区,火焰面破碎程度明显增强,孤岛结构明显增多.高宏观雷诺数下,积分尺度的增长对湍流燃烧速度起抑制作用,可能存在临界宏观雷诺数Rec,能够表现流体惯性力占主导地位的程度,决定积分尺度对湍流燃烧速度的影响效果.积分尺度能量大,扰动能力强,故积分尺度越大,火焰体积越大;但过高的湍流强度会使火焰面褶皱更加剧烈,小尺度叠加在大尺度上的程度增强,最终也使火焰体积显著增大,掩盖了积分尺度对火焰体积的影响,说明积分尺度(表征大尺度)不如湍流强度(表征叠加小尺度的程度)对火焰放热率影响大.

Keyword :

湍流强度 火焰体积 湍流尺度 预混湍流燃烧 湍流燃烧速度

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GB/T 7714 余芊芊 , 王金华 , 张玮杰 et al. 可控流场尺度预混湍流燃烧器及其火焰结构分析 [J]. | 实验流体力学 , 2018 , (2) : 10-17 .
MLA 余芊芊 et al. "可控流场尺度预混湍流燃烧器及其火焰结构分析" . | 实验流体力学 2 (2018) : 10-17 .
APA 余芊芊 , 王金华 , 张玮杰 , 张猛 , 黄佐华 . 可控流场尺度预混湍流燃烧器及其火焰结构分析 . | 实验流体力学 , 2018 , (2) , 10-17 .
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Experimental Study of Hypergolic Process of Ionic Liquids with BH3(CN)BH2(CN)- Anion EI Scopus CSCD PKU
期刊论文 | 2018 , 26 (7) , 557-564 | Hanneng Cailiao/Chinese Journal of Energetic Materials
SCOPUS Cited Count: 1
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Abstract :

The reactions of 8 newly synthesized ionic liquids containing BH3(CN)BH2(CN)- anion, (I.L.1~ I.L.8), with white fuming nitric acid (WFNA) and red fuming nitric acid (RFNA ) respectively were tested by using the long focus microscope-high speed photography technique and droplet method test device, respectively. Results show that each test achieves stable hypergolic reaction and two different flame development processes were observed. Specifically, after the contact of I.L.8 with WFNA, the microexplosion is occurred and hypergolic ignition is occurred in a short time, while after the contact of I.L.8 with RFNA the aplashing of secondary droplet is occurred. Due to the effect of Leiden Frost effect, the foam like droplets after reaction is rebounded and a short combustion reaction is appeared, the hypergolic ignition is occurred after a long time. For the ionic liquid with same heterocyclic core, the ignition delay time of the ionic liquid containing the allyl group on the side chain is the shortest, followed by the ionic liquid containing ethyl, while the ignition delay time of the ionic liquid containing butyl and WFNA is the longest. For the ionic liquid with the same side chain, the ignition delay time of the ionic liquid containing the pyridine heterocyclic ring is the longest, followed by the imidazole heterocyclic ionic liquid, and the ignition delay time of the ionic liquid containing tetrahydropyrrole reacted with WFNA is the longest.The higher the enthalpy of formation is, the shorter the ignition delay time is. © 2018, Editorial Board of Chinese Journal of Energetic Materials. All right reserved.

Keyword :

Combustion reactions Enthalpy of formation Fuming nitric acids Heterocyclic rings High-speed photography technique Hypergolic ignitions Ignition delay time Ignition delays

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GB/T 7714 Weng, Xin-Yan , Du, Zong-Gang , Yu, Jun et al. Experimental Study of Hypergolic Process of Ionic Liquids with BH3(CN)BH2(CN)- Anion [J]. | Hanneng Cailiao/Chinese Journal of Energetic Materials , 2018 , 26 (7) : 557-564 .
MLA Weng, Xin-Yan et al. "Experimental Study of Hypergolic Process of Ionic Liquids with BH3(CN)BH2(CN)- Anion" . | Hanneng Cailiao/Chinese Journal of Energetic Materials 26 . 7 (2018) : 557-564 .
APA Weng, Xin-Yan , Du, Zong-Gang , Yu, Jun , Tong, Shang-Qing , Li, Jian-Ling , Zhang, Qing-Hua et al. Experimental Study of Hypergolic Process of Ionic Liquids with BH3(CN)BH2(CN)- Anion . | Hanneng Cailiao/Chinese Journal of Energetic Materials , 2018 , 26 (7) , 557-564 .
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预混湍流火焰面褶皱结构网络拓扑研究 CSCD PKU
期刊论文 | 2018 , (1) , 19-25,63 | 实验流体力学
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Abstract :

湍流火焰结构是表征湍流与火焰相互作用的组分、速度、温度等标量场信息,理解湍流与火焰相互作用规律,验证和发展湍流燃烧模型的实验基础.针对传统曲率PDF分布反映湍流火焰面褶皱结构失准问题,利用网络拓扑结构方法可以标记系统关键节点和特征结构,构建湍流火焰面的拓扑结构.本文标记了湍流火焰面上的关键褶皱结构,分析了湍流与火焰的作用规律,结果表明:低湍流强度下,湍流火焰面的关键褶皱结构由火焰自身不稳定性引起;当湍流强度增大,湍流火焰面的关键褶皱结构由湍流尺度决定.在本生灯湍流火焰中,火焰自身不稳定性引起的火焰褶皱与火焰发展距离有关.在本生灯火焰底部,火焰自身不稳定性不引起火焰面褶皱,随着火焰向下游发展,其对火焰面影响逐渐增大,火焰褶皱程度增加.

Keyword :

褶皱结构 火焰不稳定 预混湍流火焰 网络拓扑分析 曲率PDF分布

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GB/T 7714 王金华 , 聂要辉 , 常敏 et al. 预混湍流火焰面褶皱结构网络拓扑研究 [J]. | 实验流体力学 , 2018 , (1) : 19-25,63 .
MLA 王金华 et al. "预混湍流火焰面褶皱结构网络拓扑研究" . | 实验流体力学 1 (2018) : 19-25,63 .
APA 王金华 , 聂要辉 , 常敏 , 张猛 , 黄佐华 . 预混湍流火焰面褶皱结构网络拓扑研究 . | 实验流体力学 , 2018 , (1) , 19-25,63 .
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Experimental and kinetic study on ignition delay times of 2, 5-DMF/n-heptane blends EI Scopus CSSCI-E
会议论文 | 2017 | 9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017
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Abstract :

Ignition delay times of 2, 5-dimethylfuran(2, 5-DMF)/n-heptane/oxygen/argon mixtures were measured in this study. Experiments were performed at the stoichiometric mixtures in the temperature range of 1200-1800K. A blend model for 2, 5-DMF/n-heptane blends was developed by combining two selected models for each individual fuel component. According to the combined model, the ignition delay time increases with an increase in the 2, 5-DMF addition level, non-linearly. Kinetic analysis was conducted to investigate interaction effects between two fuels. At relatively low blending ratios of 2, 5-DMF, the two fuels have negligible impacts on the reaction path of each other. As the 2, 5-DMF addition increases to relatively higher levels, decomposition path of n-heptane is significantly changed due to the competition for small radical. Copyright © 2017 by the Japan Society of Mechanical Engineers.

Keyword :

2,5-DMF Ignition delay time Ignition delays Interaction effect Kinetic modeling n-Heptanes Stoichiometric mixtures Temperature range

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GB/T 7714 Hu, Erjiang , Gao, Zhenhua , Ku, Jinfeng et al. Experimental and kinetic study on ignition delay times of 2, 5-DMF/n-heptane blends [C] . 2017 .
MLA Hu, Erjiang et al. "Experimental and kinetic study on ignition delay times of 2, 5-DMF/n-heptane blends" . (2017) .
APA Hu, Erjiang , Gao, Zhenhua , Ku, Jinfeng , Meng, Xin , Huang, Zuohua . Experimental and kinetic study on ignition delay times of 2, 5-DMF/n-heptane blends . (2017) .
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The effects of positive electric field on the spherical flame propagation at elevated pressures EI Scopus CSSCI-E
会议论文 | 2017 , 2017-December | 11th Asia-Pacific Conference on Combustion, ASPACC 2017
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Abstract :

The effects of positive DC electric field, which the electric field vector points to the burned region, on the spherical flame propagation at elevated pressures have been investigated. The results show that positive electric field shows similar effects on the enhancement on flame propagation with negative electric field, and the effects of electric field are also evident at high pressures. Cracks on the flame front increase with voltage at high pressures, and it is pronounced at higher pressures and leaner mixtures. The smaller physical scale cracks could be observed at 0.5MPa with 10kV electric field, which is quite different with previous study [8] at 0.2MPa pressure and AC electric field. The flame initiation time, which is analyzed from pressure data, decreases with voltage increases. And it also shows more obvious at higher pressures and leaner mixtures. © 2018 Combustion Institute. All Rights Reserved.

Keyword :

AC electric field Dc electric field Effects of electric fields Electric field vectors Elevated pressure Flame propagation Spherical flames Voltage increase

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GB/T 7714 Li, Yiming , Wang, Jinhua , Wei, Xuxing et al. The effects of positive electric field on the spherical flame propagation at elevated pressures [C] . 2017 .
MLA Li, Yiming et al. "The effects of positive electric field on the spherical flame propagation at elevated pressures" . (2017) .
APA Li, Yiming , Wang, Jinhua , Wei, Xuxing , Wu, Xiaomin , Huang, Zuohua , Mu, Haibo et al. The effects of positive electric field on the spherical flame propagation at elevated pressures . (2017) .
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Influence of Combustion Chamber on Natural Gas Engine Performance and Optimization EI Scopus CSCD PKU
期刊论文 | 2017 , 35 (3) , 215-222 | Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines)
SCOPUS Cited Count: 1
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Abstract :

AVL Fire numerical simulation software was used to make the optimal design of combustion chamber on a natural gas engine. Based on the analysis of combustion chamber configuration, two optimized combustion chambers were obtained. Based on the analysis of heat release rate, turbulent kinetic energy and velocity fields, it is found that reducing the combustion bowl diameter is conducive to enhance the tumble and swirl flow motion, thus accelerates the combustion process due to the increase of the turbulent kinetic energy and gas velocity. However, the small convex platform in the optimized scheme I increases the energy dissipation of intake gas, leading to a lower turbulent kinetic energy at ignition timing, and there was no improvement in the flame development duration, while the rapid combustion duration has been speeded up under the effect of squish flow. Bench test work shows that the optimized chamber II decreases by 2.9% in brake specific gas consumption and an average of 18.3℃ reduction of exhaust temperature. Furthermore, the optimizing calibration results show that brake specific gas consumption of the optimized scheme II has improved by 1.5% than the original combustion chamber in the case of same nitrogen oxides emissions. © 2017, Editorial Office of the Transaction of CSICE. All right reserved.

Keyword :

Combustion duration Combustion pro-cess Exhaust temperature Heat Release Rate (HRR) Nitrogen oxides emission Numerical simulation software Spark ignition Turbulent kinetic energy

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GB/T 7714 Han, Xudong , Huang, Zuohua , Chen, Qinxue et al. Influence of Combustion Chamber on Natural Gas Engine Performance and Optimization [J]. | Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) , 2017 , 35 (3) : 215-222 .
MLA Han, Xudong et al. "Influence of Combustion Chamber on Natural Gas Engine Performance and Optimization" . | Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) 35 . 3 (2017) : 215-222 .
APA Han, Xudong , Huang, Zuohua , Chen, Qinxue , Yang, Qiang , Xiong, Jie , Yang, Xing . Influence of Combustion Chamber on Natural Gas Engine Performance and Optimization . | Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) , 2017 , 35 (3) , 215-222 .
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Single-valued prediction of markers on heat release rate for laminar premixed biogas-hydrogen and methane-hydrogen flames EI SCIE Scopus
期刊论文 | 2017 , 133 , 35-45 | ENERGY | IF: 4.968
WoS CC Cited Count: 5 SCOPUS Cited Count: 5
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Abstract :

Numerical studies on the 1-D laminar premixed flame were conducted utilizing the detailed mechanisms to evaluate the validity of several heat release rate (HRR) markers for the single-valued prediction on the HRR in a wide range of conditions. The biogas and methane with hydrogen enrichment are used as the fuel. The peak-to-peak correlation and the peak-to-integrated correlation of considered markers and HRR in premixed flames were established to examine their sensitivity to the equivalence ratio and the fuel composition. For both premixed biogas and methane flames considered, the O x CH3 product has the almost constant correlation with peak or total HRR at different conditions. Thus the O x CH3 product is suggested as the most reliable indicator for the HRR imaging in the unstretched premixed flames with the unknown equivalence ratio. HCO is demonstrated to be a reliable marker in the premixed combustion, while the OH x CH2O, H x CH2O and H x HO2 products are inadequate for the single-valued prediction on the HRR because their correlations with HRR are sensitive to the equivalence ratio, indicating that these markers cannot reflect the HRR change accurately if the local equivalence ratio is affected. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Single-valued prediction Flame markers Heat release rate imaging Premixed combustion

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GB/T 7714 Wei, Z. L. , Leung, C. W. , Cheung, C. S. et al. Single-valued prediction of markers on heat release rate for laminar premixed biogas-hydrogen and methane-hydrogen flames [J]. | ENERGY , 2017 , 133 : 35-45 .
MLA Wei, Z. L. et al. "Single-valued prediction of markers on heat release rate for laminar premixed biogas-hydrogen and methane-hydrogen flames" . | ENERGY 133 (2017) : 35-45 .
APA Wei, Z. L. , Leung, C. W. , Cheung, C. S. , Huang, Z. H. . Single-valued prediction of markers on heat release rate for laminar premixed biogas-hydrogen and methane-hydrogen flames . | ENERGY , 2017 , 133 , 35-45 .
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An ignition delay time and chemical kinetic study of ethane sensitized by nitrogen dioxide EI SCIE Scopus
期刊论文 | 2017 , 207 , 389-401 | FUEL | IF: 4.908
WoS CC Cited Count: 6 SCOPUS Cited Count: 7
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Abstract :

Nitrogen dioxide (NO2) is a dominant component of NOx pollution in combustion of internal combustion engines and gas turbines. Its sensitization on ignition of ethane which is a main component of natural gas has been investigated in this experimental and kinetic study. Ignition delay times of NO2/C2H6/O-2/Ar mixtures, with blending ratios of NO2:C2H6 of 0.3:1 and 1:1, were measured in a shock tube. Experimental conditions cover a range of pressures (1.2-20 atm), temperatures (950-1700 K) and equivalence ratios (0.5-2.0). Similarly to our previous work of CH4/NO2 (Deng et al., 2016) [14], NO2 addition promotes the reactivity of ethane and reduces the global activation energy particularly at higher pressures (p > 5.0 atm) and lower temperatures (T < 1175 K), whereas it only presents a limited effect at low pressure (1.0 atm) and higher temperatures (T > 1175 K). Furthermore, an opposite effect of NO2 addition is observed in both the experiments and the simulations at different temperature regimes. Compared to fuel-rich mixture, NO2 addition exhibits more significantly promoting effect on the ignition of fuel-lean mixture under given NO2 concentration. Four literature kinetic mechanisms and an updated mechanism proposed in this study have been compared to simulate the new ignition delay time data and the literature data. Overall, the proposed model is capable of reproducing the experimental results measured by various facilities over a wide range of conditions. The proposed model is thus used to carry out the sensitivity and flux analyses to clarify the chemistry interaction between NO2 and ethane. Based on the kinetic analyses, the impact of NO2 has been expounded at different conditions. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Chemical sensitization Nitrogen dioxide Ethane Ignition delay times

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GB/T 7714 Deng, Fuquan , Pan, Youshun , Sun, Wuchuan et al. An ignition delay time and chemical kinetic study of ethane sensitized by nitrogen dioxide [J]. | FUEL , 2017 , 207 : 389-401 .
MLA Deng, Fuquan et al. "An ignition delay time and chemical kinetic study of ethane sensitized by nitrogen dioxide" . | FUEL 207 (2017) : 389-401 .
APA Deng, Fuquan , Pan, Youshun , Sun, Wuchuan , Yang, Feiyu , Zhang, Yingjia , Huang, Zuohua . An ignition delay time and chemical kinetic study of ethane sensitized by nitrogen dioxide . | FUEL , 2017 , 207 , 389-401 .
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Experimental and kinetic study of pentene isomers and n-pentane in laminar flames EI SCIE Scopus
期刊论文 | 2017 , 36 (1) , 1279-1286 | PROCEEDINGS OF THE COMBUSTION INSTITUTE | IF: 5.336
WoS CC Cited Count: 16 SCOPUS Cited Count: 14
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Abstract :

Laminar flame speeds of three pentene isomers (1-pentene, 2-pentene and 2-methyl-2-butene) and n-pentane are investigated at equivalence ratios of 0.7-1.6, initial pressures of 1-4 atm, and initial temperatures of 353-433 K using a constant volume combustion bomb. Results show that the laminar flame speeds increase in the order of 2-methyl-2-butene, n -pentane, 2-pentene, and 1-pentene. A recently published model on pentane isomers (NUI-PI) has been optimized by refining the submodels of the 1-pentene and 2-methyl-2-butene. This optimized model yields reasonable agreement with the experimental data except over-predictions for 2-pentene. The analysis indicates the discrepancy of laminar flame speeds between 1-pentene and n -pentane is mainly caused by the thermal effect, different from the discrepancy between 1-pentene and 2-methyl-2-butene which mainly results from the chemical kinetic effect. The kinetic effect is further investigated employing the sensitivity and reaction path analyses. The analyses reveal that 1-pentene generates the H-radical precursor ethyl radical, while 2-methyl-2-butene produces large amount of the H-consuming branching intermediates (IC4H8, AC(5)H(9)-C, CC5H9-B and B13DE2MJ) and presents the weaker H regenerating ability. In addition, compared with 1-pentene, 2-methyl-2-butene yields larger amount of methyl radical which would block the whole reaction process. (C) 2016 by The Combustion Institute. Published by Elsevier Inc.

Keyword :

Chemical kinetics Pentene isomers Laminar flame speed n-Pentane

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GB/T 7714 Cheng, Yu , Hu, Erjiang , Lu, Xin et al. Experimental and kinetic study of pentene isomers and n-pentane in laminar flames [J]. | PROCEEDINGS OF THE COMBUSTION INSTITUTE , 2017 , 36 (1) : 1279-1286 .
MLA Cheng, Yu et al. "Experimental and kinetic study of pentene isomers and n-pentane in laminar flames" . | PROCEEDINGS OF THE COMBUSTION INSTITUTE 36 . 1 (2017) : 1279-1286 .
APA Cheng, Yu , Hu, Erjiang , Lu, Xin , Li, Xiaotian , Gong, Jing , Li, Qianqian et al. Experimental and kinetic study of pentene isomers and n-pentane in laminar flames . | PROCEEDINGS OF THE COMBUSTION INSTITUTE , 2017 , 36 (1) , 1279-1286 .
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High-temperature oxidation kinetics of iso-octane/n-butanol blends-air mixture EI SCIE Scopus
期刊论文 | 2017 , 133 , 443-454 | ENERGY | IF: 4.968
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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Abstract :

A chemical kinetic mechanism of n-butanol/iso-octane blends (Model BI) was established on the basis of a n-butanol reaction submechanism and part of a high-temperature oxidation mechanism of iso-octane. Model BI was validated against laminar flame speeds, ignition delay times and JSR data, and proved to be applicable and reliable. It also found that the laminar flame speed of blends increased linearly and monotonically with the increasing ratio of n-butanol. Then detailed kinetic pathway analysis of n-butanol/iso-octane blends were performed based on Model BI to find out the reason for the accelerating effect of added n-butanol. The most influential elementary reactions were determined for the blend, and the laminar flame speed is largely negative related to the concentration of iC(4)H(8), C3H6 and CH3, while C2H4 and C2H3 contribute to the promotion of laminar flame speeds. Flame structures of n-butanol blending with iso-octane were also computed and correspond to the kinetic pathway analysis. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Chemical kinetic mechanism n-butanol Iso-octane Laminar flame speed

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GB/T 7714 Li, Xiaotian , Hu, Erjiang , Meng, Xin et al. High-temperature oxidation kinetics of iso-octane/n-butanol blends-air mixture [J]. | ENERGY , 2017 , 133 : 443-454 .
MLA Li, Xiaotian et al. "High-temperature oxidation kinetics of iso-octane/n-butanol blends-air mixture" . | ENERGY 133 (2017) : 443-454 .
APA Li, Xiaotian , Hu, Erjiang , Meng, Xin , Lu, Xin , Huang, Zuohua . High-temperature oxidation kinetics of iso-octane/n-butanol blends-air mixture . | ENERGY , 2017 , 133 , 443-454 .
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